David's Astronomy - Astronomical Transients 2021

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Astronomical Transients - 2021

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Transients
2022

This page documents observations and images of Astronomical Transients (AT) with discovery dates in 2021.
(Note: Supernovae with discovery dates in 2021 are presented on a separate page SN 2021 )
(Note: Some images may roll over into the following year)

Galactic Transients (2021)
     Name, type, discovery date

AT 2021axb - Type YSO? Transient (2021-01-19)

AT 2021bpy - Transient (2021-02-03)

AT 2021bur - CV Type Transient (2021-02-04)

AT 2021ckv - Type YSO Transient, PR Ori (2021-02-08)

AT 2021dbp - Type CV Transient (2021-02-14)

AT 2021dma - CV Type Transient (2021-02-18)

AT 2021dmc - CV Type Transient (2021-02-17)

AT 2021dtd - Type CV Transient (2021-02-20), Be-type event

AT 2021dvd - CV Type Transient (2021-02-21)

AT 2021dwy - CV Type Transient (2021-02-22)

AT 2021gux - Type CV Transient , TT Boo (2021-03-21)

AT 2021gyc - Type CV Transient (2021-03-19)

AT 2021hdk - CV Type Transient (2021-03-25)

AT 2021hfr - Ulens? Transient (2021-03-26)

AT 2021ife - Type CV Transient (2021-04-05) (Attempt)

AT 2021kkh - Type Nova? Transient (2021-04-22) (Attempt)

AT 2021kmb - Transient (2021-04-22) (Attempt)

AT 2021koz - Type QSO? Transient (2021-04-28)

AT2021wuy - Type CV Transient (2021-08-22) (Attempt)

AT 2021wxe - CV Type Transient (2021-08-23)

AT 2021xbh - Type Nova? Transient (2021-08-27) (Attempt)

AT 2021xmw - Type YSO Transient, V546 Mon (2021-08-30)

AT 2021xrf - Type CV? Transient (2021-09-02) (Attempt)

AT 2021yel - CV Type Transient (2021-09-05)

AT 2021yjl - CV Type Transient (2021-09-06) (Attempt)

AT 2021zkf - YSO Transient, V0645 Cyg (2021-09-13)

AT 2021aagc - HPM Type Transient (2021-09-26)

AT 2021aecv - CV Type Transient (2021-11-09)

AT 2021aeft - CV Type Transient (2021-11-09)

AT 2021aena - CV Type Transient (2021-11-11) (Attempt)

AT 2021aeoz - CV Type Transient (2021-11-13) (Attempt)

AT 2021aesn - CV Type Transient (2021-11-14) (Attempt)

AT 2021afdl - CV Type Transient (2021-11-22)

AT 2021agbq - Type ulens? Transient (2021-12-02)

AT 2021agdc - CV Type Transient (2021-12-05) (Attempt)

AT 2021agdj - CV Type Transient (2021-12-05)

AT 2021aggy - CV Type Transient (2021-12-12)

AT 2021agjs - Ulens? Transient (2021-12-16)

AT 2021agrm - Type HPM Transient (2021-12-25)

AT 2021agpw - CV Type Transient (2021-12-27)

AT 2021agxs - CV Type Transient Star (2021-12-28)

Extragalactic Transients (2021)
     Name, type, discovery date, host galaxy (if relevant)

M31 Transients

AT 2021fbz - Extragalactic Nova (2021-03-08) in M31 (Attempt)

AT 2021zdh - Transient (2021-09-18) in M31 (Attempt)

AT 2021aaxp - CV Type Transient (2021-10-09) in M31

AT 2021aceg - Extragalactic Nova (2021-10-25) in M31

AT 2021yul - Nova (2021-09-13) in M110

M33 Transients

AT 2021wcf - Transient (2021-07-20) in M33

Other Extragalactic Transients

AT 2021rl - BL Type Transient (2021-01-06) in QSO 0954+658

AT 2021bgi - AGN / Transient (2021-01-27) in 2MASX J12303540+4257559

AT 2021biy- Type LRN Transient (2021-01-29) in NGC 4631

AT 2021blu - LBV Transient (2021-02-01) in UGC 5829

AT 2021cek - Unconfirmed Transient (2021-02-06) in NGC 4041 (Unconfirmed)

AT 2021djx - Type QSO Transient (2021-02-19) (Attempt)

AT 2021fbu - Type AGN Transient (2021-03-06) in VV 807

AT 2021fmd - Transient (2021-03-12) in NGC 3515 (Unconfirmed)

AT 2021fyd - Transient (2022-03-17) in IC 357 (Unconfirmed)

AT 2021hut - Type AGN Transient (2021-04-03) in PGC 48045

AT 2021ilb - Transient (2021-04-05) in M61 (Unconfirmed)

AT 2021irz - Transient (2021-04-07) in UGC 1977 (Attempt)

AT 2021lwx - Type AGN Transient (2021-04-13) in Unnamed Galaxy (Attempt)

AT 2021knq - Transient (2021-04-26) in UGC 8426

AT 2021ugn - Transient (2021-07-28) in UGC 11252 (Attempt)

AT 2021vqu - Type QSO Transient (2021-08-09)

AT2021wkx - Unconfirmed Transient (2021-08-20) in WISEA Galaxy / PGC 2670810

AT 2021abbn - Transient (2021-10-07) in UGC 3383 (Attempt)

AT 2021ably - Transient (2021-10-14) in UGC 5994

AT 2021acbu - Transient (2021-10-24) in LEDA 1352843 (Attempt, Faded)

AT 2021aczn - Type HPM Transient (2021-11-01) in NGC 1569

AT 2021adlx - Transient (2021-11-05) in NGC 4134 (Attempt)

AT 2021afkg - AGN Transient (2021-11-23) in 2MASS J09361749+0918146

AT 2021agbu - Type HPM Transient (2021-12-03) in NGC 1325A (Attempt)

AT 2021agfn - Blazer Transient (2021-12-12) in PKS0735+17

AT 2021agiv - Type AGN Transient (2021-12-14) in Mrk 506

AT 2021agrr - Type BL Transient (2021-12-27)

AT 2021ahep - Type AGN Transient (2021-12-29) in UGC 1098

Galactic Transients

AT 2021axb - Type YSO? Transient (discovered 2021-01-19)

AT 2021axb (Cepheus)
AT 2021axb (Type: YSO?) discovered 2021/01/19.592 UT by Gaia
Alias: Gaia21ajc
Discovery Magnitude 16.72 (vs Historic magnitude 17.84)
( TNS 2021axb , Gaia21ajc )

AT 2021axb - 2022-10-26 (T+645.4d)
Position of reported transient (very faint) is shown by white circle

Annotated CCD Image (50% size, linear scale)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2022-10-26 22:46 UT (#1049051-55)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021axb - 2022-10-26 (T+645.4d)
Image below (2022-10-26.943) was taken 645.4 days after discovery of 2021axb
Position of reported transient (very faint) is shown by white cross-hairs
Measured magnitude +18.42

Annotated CCD Image (100% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2022-10-26 22:46 UT (#1049051-55)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021axb - 2022-11-04 (T+654.3d)
Image below (2022-11-04.931) was taken 654.3 days after discovery of 2021axb
Position of earlier transient (no longer visible) is shown by white cross-hairs

Annotated CCD Image (100% size, linear scale, cropped)
2 x 180s exposure (average combine), 3x3 binning, Clear Filter
2022-11-04 22:28 UT (#1054119-23)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021bpy - Transient (discovered 2021-02-03)

AT 2021bpy (Andromeda)
AT2021bpy (Type: unk) discovered 2021/02/03.162 UT by ZTF
Alias: ZTF19aaywash
Discovery Magnitude 14.19 (r-ZTF Filter)
( Rochester Supernova site | Discovery Image ) | ZTF19aaywash )
( TNS 2021bpy )

(see https://lasair.roe.ac.uk/lasair/static/ztf/stamps/jpg/1494/candid1494161754615015005.jpg )

AT 2021bpy - 2021-09-30 (T+238.9d)
Image below (2021-09-30.074) was taken 238.9 days after discovery of 2021bpy
Previously reported transient position (now faded & no longer visible) is shown approximately by white cross hairs.
Measured Magnitude of offset star is +15.28 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2021-09-30 01:54 UT (#918232-36)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021bpy - 2021-10-25 (T+263.9d)
Image below (2021-10-25.073) was taken 263.9 days after discovery of 2021bpy
Previously reported transient position (now faded & no longer visible)
is shown approximately by white cross hairs.

Annotated CCD Image (125% size, square root scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2021-10-25 01:54 UT (#927094-98)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT2021bpy - 2021-12-17 (T+317.6d)
Image below (2021-12-17.774) was taken 317.6 days after discovery of 2021bpy
Previously reported transient position (now faded & no longer visible)
is shown approximately by white cross hairs.
Cross-Hair poistion is incorrect - Picture to be redone !

Annotated CCD Image (125% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-12-17 18:45 UT (#943003-07)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021bur - CV Type Transient (discovered 2021-02-04)

AT 2021bur (Hercules)
AT 2021bur (Type: CV) discovered 2021/02/04.117 UT by Gaia
Alias: Gaia21apv
Discovery Magnitude 15.97 (G-GaiaFilter)
vs Historic Magnitude 17.10 +/- 0.42 SD
Variable blue source brightens above previous level,
GALEX detection, candidate CV
( TNS 2021bur | Gaia21apv )

AT 2021bur - 2021-06-05 (T+121.9d)
Image below (2021-06-05.999) was taken 121.9 days after discovery of 2021bur
Position of transient (faint) is indication by white cross-hairs
Estimated Magnitude +16.2 (Clear Filter)

Annotated CCD Image (125% size, linear scale, cropped)
60s exposure (single frame), 3x3 binning, C Filter
2021-06-05 23:59 UT (#900022)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021ckv - Type YSO Transient (discovered 2021-02-08), PR Ori

AT 2021ckv / PR Ori (Orion)
AT 2021ckv (Type: YSO) discovered 2021/02/08.759 UT by Gaia
Alias: Gaia21arx, GCVS PR Ori
Discovery Magnitude 12.25 (G-Gaia Filter)
vs Historic Magnitude 13.75 +/- 0.67 SD
Brightening in known YSO, ESO-HA 1481 (4 mags in 3 years)
[ TNS 2021ckv | Gaia21arx ]
( Light Curve 2012-2018, Reipurth et al )

AT 2021ckv / PR Ori - 2021-02-22 (T+14.1d)
Image below (2021-02-22.822) was taken 14.1 days after discovery of 2021ckv
Position of reported YSO Type Transient is shown by white cross-hairs.
Measured Magnitude +11.1 (brightened)
(vs normal range of +12.2 to +13.6)

Annotated CCD Image (50% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-02-22 19:52 UT (#861020-24)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021ckv / PR Ori - 2021-02-25 (T+17.1d)
Image below (2021-02-25.849) was taken 17.1 days after discovery of 2021ckv
Position of reported YSO Type Transient is shown by white cross-hairs.
Measured Magnitude +11.5 (fading)

Annotated CCD Image (50% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-02-25 20:31 UT (#863013-17)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021ckv / PR Ori - 2021-02-26 (T+18.1d)
Image below (2021-02-26.872) was taken 18.1 days after discovery of 2021ckv
Position of reported YSO Type Transient is shown by white cross-hairs.
Measured Magnitude +11.6 (fading)

Annotated CCD Image (50% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-02-26 21:06 UT (#864055-59)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021ckv / PR Ori - 2021-02-27 (T+19.1d)
Image below (2021-02-27.861) was taken 19.1 days after discovery of 2021ckv
Position of reported YSO Type Transient is shown by white cross-hairs.
Measured Magnitude +11.6 (fading ?)

Annotated CCD Image (50% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-02-27 20:49 UT (#865049-53)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021ckv / PR Ori - 2021-03-05 (T+25.1d)
Image below (2021-03-05.905) was taken 25.1 days after discovery of 2021ckv
Position of reported YSO Type Transient is shown by white cross-hairs.
Measured Magnitude +11.2 (brightening)

Annotated CCD Image (50% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-05 21:53 UT (#867060-64)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021ckv - 2021-03-13 (T+33.1d)
Image below (2021-03-13.897) was taken 33.1 days after discovery of 2021ckv
Position of reported YSO Type Transient is shown by white cross-hairs.
Measured Magnitude +10.86
(vs normal range of +12.2 to +13.6)
Poor quality image (bright sky & thin cloud)

Annotated CCD Image (50% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-13 21:41 UT (#869034-38)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021ckv - 2021-03-16 (T+36.1d)
Image below (2021-03-16.880) was taken 36.1 days after discovery of 2021ckv
Position of reported YSO Type Transient is shown by white cross-hairs.
Measured Magnitude +11.10
(vs normal range of +12.2 to +13.6)

Annotated CCD Image (50% size, linear scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-16 21:16 UT (#871025-27)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021ckv / PR Ori - 2021-03-26 (T+46.1d)
Image below (2021-03-26.854) was taken 46.1 days after discovery of 2021ckv
Position of reported YSO Type Transient is shown by white cross-hairs.
Measured Magnitude +11.45 (vs normal range of +12.2 to +13.6)

Annotated CCD Image (50% size, linear scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-26 20:38 UT (#876005-08)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021ckv / PR Ori - 2021-03-29 (T+49.1d)
Image below (2021-03-29.863) was taken 49.1 days after discovery of 2021ckv
Position of reported YSO Type Transient is shown by white cross-hairs.
Measured Magnitude +11.07 (vs normal range of +12.2 to +13.6)

Annotated CCD Image (50% size, linear scale, cropped)
4 x 60s exposure (average combine), 3x3 binning, C Filter
2021-03-29 20:46 UT (#877012-15)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021ckv - 2021-09-20 (T+223.4d)
Image below (2021-09-20.169) was taken 223.4 days after discovery of 2021ckv
Position of reported YSO Type Transient is shown by white cross-hairs.
Measured Magnitude +11.11 (vs normal range of +12.2 to +13.6)

Annotated CCD Image (50% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2021-09-20 04:06 UT (#914203-07)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021ckv / PR Ori - 2021-09-28 (T+231.4d)
Image below (2021-09-28.181) was taken 231.4 days after discovery of 2021ckv
Position of reported YSO Type Transient is shown by white cross-hairs.
Measured Magnitude +11.10 (Clear Filter)

Annotated CCD Image (50% size, linear scale, cropped)
4 x 60s exposure (average combine), 3x3 binning, C Filter
2021-10-04 02:35 UT (#920165-69)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021dbp - Type CV Transient (discovered 2021-02-14)

AT 2021dbp (Auriga)
AT 2021dbp (Type: CV) discovered 2021/02/14.535 UT by Gaia
Alias: Gaia21auv, GSC 2374:280
( Rochester Supernova site | Gaia21auv )
Based on Gaia Alert at magnitude +10.04

AT 2021dbp - 2021-02-16 (T+2.3d)
CV is shown by white cross hairs.

Annotated CCD Image (50% size, linear scale)
2 x 60s exposure (average combine), 3x3 binning, C Filter
2021-02-16 20:34 UT (#859046-48)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021dbp
Image Sequence T+2.3d to T+43.3d
Transient Discovery Date : 2021-02-14.535 (T0)

AT 2021dbp - 2021-02-16 (T+2.3d)
Image below (2021-02-16.854) was taken 2.3 days after discovery of 2021dbp
CV is shown by white cross hairs. Measured Magnitude +10.5
(vs GSC magnitude +10.2)

Annotated CCD Image (100% size, linear scale, cropped)
2 x 60s exposure (average combine), 3x3 binning, C Filter
2021-02-16 20:34 UT (#859046-48)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021dbp - 2021-02-19 (T+4.5d)
Image below (2021-02-19.014) was taken 4.5 days after discovery of 2021dbp
CV is shown by white cross hairs. Measured Magnitude +10.3 vs GSC magnitude +10.2

Annotated CCD Image (100% size, linear scale, cropped)
2 x 60s exposure (average combine), 3x3 binning, C Filter
2021-02-19 00:21 UT (#860040-41)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021dbp - 2021-02-22 (T+8.4d)
Image below (2021-02-22.928) was taken 8.4 days after discovery of 2021dbp
CV is shown by white cross hairs. Measured Magnitude +10.8 (fading)

Annotated CCD Image (100% size, linear scale, cropped)
3 x 60s exposure (average combine), 3x3 binning, C Filter
2021-02-22 22:21 UT (#861099-101)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021dbp - 2021-02-25 (T+10.5d)
Image below (2021-02-25.075) was taken 10.5 days after discovery of 2021dbp
CV is shown by white cross hairs. Measured Magnitude +10.5 (brightening ?)

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2021-02-25 01:52 UT (#862004-08)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021dbp - 2021-02-25 (T+11.3d)
Image below (2021-02-25.878) was taken 11.3 days after discovery of 2021dbp
CV is shown by white cross hairs. Measured Magnitude +10.95 (fading)

Annotated CCD Image (100% size, linear scale, cropped)
3 x 60s exposure (average combine), 3x3 binning, C Filter
2021-02-25 21:08 UT (#863029-32)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021dbp - 2021-02-26 (T+12.4d)
Image below (2021-02-26.944) was taken 12.4 days after discovery of 2021dbp
CV is shown by white cross hairs. Measured Magnitude +10.90 (flat ?)

Annotated CCD Image (100% size, linear scale, cropped)
2 x 60s exposure (average combine), 3x3 binning, C Filter
2021-02-26 22:44 UT (#864122-23)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021dbp - 2021-02-27 (T+13.4d)
Image below (2021-02-27.981) was taken 13.4 days after discovery of 2021dbp
CV is shown by white cross hairs. Measured Magnitude +10.95 (fading)

Annotated CCD Image (100% size, linear scale, cropped)
4 x 60s exposure (average combine), 3x3 binning, C Filter
2021-02-27 23:35 UT (#865099-103)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021dbp - 2021-03-05 (T+19.4d)
Image below (2021-03-05.888) was taken 19.4 days after discovery of 2021dbp
CV is shown by white cross hairs. Measured Magnitude +10.95 (flat ?)

Annotated CCD Image (100% size, linear scale, cropped)
4 x 60s exposure (average combine), 3x3 binning, C Filter
2021-03-05 21:22 UT (#867047-50)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021dbp - 2021-03-13 (T+27.5d)
Image below (2021-03-13.996) was taken 27.5 days after discovery of 2021dbp
CV is shown by white cross hairs. Measured Magnitude +10.57

Annotated CCD Image (100% size, linear scale, cropped)
60s exposure (single frame), 3x3 binning, C Filter
2021-03-13 23:55 UT (#869094)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021dbp - 2021-03-22 (T+36.4d)
Image below (2021-03-22.885) was taken 36.4 days after discovery of 2021dbp
CV is shown by white cross hairs. Measured Magnitude +11.0 vs GSC magnitude +10.2

Annotated CCD Image (100% size, linear scale, cropped)
4 x 60s exposure (average combine), 3x3 binning, C Filter
2021-03-22 21:18 UT (#874025-29)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021dbp - 2021-03-29 (T+43.3d)
Image below (2021-03-29.855) was taken 43.3 days after discovery of 2021dbp
CV is shown by white cross hairs. Measured Magnitude +10.89 vs GSC magnitude +10.2

Annotated CCD Image (100% size, linear scale, cropped)
4 x 60s exposure (average combine), 3x3 binning, C Filter
2021-03-29 20:35 UT (#877005-08)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021dma - CV Type Transient (discovered 2021/02/18)

AT 2021dma (Cepheus)
AT 2021dma (Type: CV) discovered 2021/02/18.076 UT by Gaia
Alias: Gaia21aye
Discovery Magnitude 14.02 (G-GaiaFilter)
vs Historic Magnitude 14.24 +/- 0.04 SD
Galactic plane source brightens by 0.2 mag
( TNS 2021dma | Gaia21aye )

AT 2021dma - 2021-07-24 (T+156.9d)
Image below (2021-07-24.983) was taken 156.9 days after discovery of 2021dma
Position of transient (distinct) is indication by white cross-hairs
Measured Magnitude +13.58 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2021-07-24 23:38 UT (#902034-38)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021dmc - CV Type Transient (discovered 2021/02/17)

AT 2021dmc (Cygnus)
AT 2021dmc (Type: CV) discovered 2021/02/17.839 UT by Gaia
Alias: Gaia21ayg
Discovery Magnitude 14.16 (G-GaiaFilter)
vs Historic Magnitude 14.45 +/- 0.01 SD
Source in the Galactic plane brightens by 0.3 mag
( TNS 2021dmc | Gaia21ayg )

AT 2021dmc - 2021-07-25 (T+157.2d)
Image below (2021-07-25.064) was taken 157.2 days after discovery of 2021dmc
Position of transient (faint) is indication by white cross-hairs
Measured Magnitude +13.47 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2021-07-25 01:35 UT (#902135-39)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021dtd - Type CV Transient (discovered 2021-02-20), Be-type event

AT 2021dtd (Cepheus)
AT 2021dtd (Type: CV) discovered 2021/02/20.084 UT by Gaia
Alias: Gaia21bal, GSC 2374:280
( Rochester Supernova site | Gaia21bal )
0.25 mag brightening in blue star, Be-type event
Alerting magnitude +11.05
Historic magnitude +11.29
(GSC Magnitude +11.17)

AT 2021dtd - 2021-02-25 (T+5.1d)
Image below (2021-02-25.143) was taken 5.1 days after discovery of 2021dtd
CV is shown by white cross hairs. Measured Magnitude +10.9
Bright star is same FOV is HIP 105091 (mag +6.4)

Annotated CCD Image (100% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-02-25 03:36 UT (#862057-61)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021dtd - 2021-03-12 (T+20.1d)
Image below (2021-03-12.150) was taken 20.1 days after discovery of 2021dtd
CV is shown by white cross hairs. Measured Magnitude +10.5

Annotated CCD Image (100% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-12 03:45 UT (#868110-14)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021dtd - 2021-03-14 (T+22.0d)
Image below (2021-03-14.092) was taken 22.0 days after discovery of 2021dtd
CV is shown by white cross hairs. Measured Magnitude +10.92

Annotated CCD Image (100% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-14 02:22 UT (#869149-53)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021dtd - 2021-03-22 am (T+30.1d)
Image below (2021-03-22.175) was taken 30.1 days after discovery of 2021dtd
CV is shown by white cross hairs. Measured Magnitude +11.09

Annotated CCD Image (100% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-22 04:21 UT (#873110-14)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021dtd - 2021-03-22 pm (T+30.9d)
Image below (2021-03-22.951) was taken 30.9 days after discovery of 2021dtd
CV is shown by white cross hairs. Measured Magnitude +10.8

AT 2021dvd - CV Type Transient (discovered 2021-02-21)

AT 2021dvd (Vulpecula)
AT 2021dvd (Type: CV) discovered 2021/02/21.110 UT by Gaia
Alias: Gaia21bba
Discovery Magnitude 14.42 (G-GaiaFilter)
vs Historic Magnitude 14.61 +/- 0.05 SD
~ 0.2 mag rise in bright Gaia source in the Galactic plane
( TNS 2021dvd | Gaia21bba )

AT 2021dvd - 2021-07-24 (T+153.8d)
Image below (2021-07-24.958) was taken 153.8 days after discovery of 2021dvd
Position of transient (faint) is indication by white cross-hairs
Measured Magnitude +13.47 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2021-07-24 23:02 UT (#902004-08)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021dwy - CV Type Transient (discovered 2021-02-22)

AT 2021dwy (Vulpecula)
AT 2021dwy (Type: CV) discovered 2021/02/22.613 UT by Gaia
Alias: Gaia21bch
Discovery Magnitude 14.20 (G-GaiaFilter)
vs Historic Magnitude 14.59 +/- 0.09 SD
Gaia source brightens by 0.4 mag
( TNS 2021dwy | Gaia21bch )

AT 2021dwy - 2021-07-25 (T+152.4d)
Image below (2021-07-25.028) was taken 152.4 days after discovery of 2021dwy
Position of transient (faint) is indication by white cross-hairs
Measured Magnitude +14.62 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
4 x 60s exposure (average combine), 3x3 binning, C Filter
2021-07-25 00:43 UT (#902097-101)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2021dwy on Transients 2021 Page >>

AT 2021gux - Type CV Transient , TT Boo (discovered 2021-03-21)

AT 2021gux (Bootes)
AT 2021gux (Type: CV) discovered 2021/03/21.599 UT by Gaia
Alias: Gaia21blj, TT Boo
Discovery Magnitude 13.53 (g-Gaia Filter)
vs Historical Magnitude 17.19 +/- 1.79
~5.5 mag outburst in known CV TT Boo
Gaia, 2021-01-27 21:17, Mag 18.85
Gaia, 2021-03-21 16:09, Mag 13.46
Gaia, 2021-05-04 08:39, Mag 17.95
Gaia, 2021-05-19 08:44, Mag 19.00
( TNS 2021gux | Gaia21blj )

AT 2021gux - Known CV Star TT Boo (T+5.6d)
Position of CV is shown by white cross-hairs.

Annotated CCD Image (50% size, linear scale)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2021-03-27 03:40 UT (#876079-83)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021gux / TT Boo - 2021-03-27 (T+5.6d)
Image below (2021-03-27.151) was taken 5.6 days after discovery of 2021guxv
Position of CV is shown by white cross-hairs.
Measured Magnitude +13.8 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2021-03-27 03:40 UT (#876079-83)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021gux - 2021-04-16 (T+25.5d)
Image below (2021-04-16.107) was taken 25.5 days after discovery of 2021gux
Position of CV is shown by white cross-hairs.
Measured Magnitude +18.43 (Clear Filter)
Variable has returned to normal levels

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2021-04-16 02:37 UT (#886152-56)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021gyc - CV Type Transient (discovered 2021-03-19)

AT 2021gyc (Perseus)
AT 2021gyc (Type: CV) discovered 2021/03/19.526 UT by Gaia
Alias: Gaia21blz
Bright blue gal.plane source rises by 0.2 mag
Alerting Magnitude 8.38 (vs historic magnitude 8.62)
( Rochester Supernova site | Gaia21blz )

AT 2021gyc (T+10.4d)
CV is shown by white cross hairs.

Annotated CCD Image (50% size, linear scale)
2 x 60s exposure (average combine), 3x3 binning, C Filter
2021-03-29 21:23 UT (#877031-32)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021gyc - 2021-03-29 (T+10.4d)
Image below (2021-03-29.888) was taken 10.4 days after discovery of 2021gyc
CV is shown by white cross hairs.
Measured Magnitude +10.89 (probably underestimated)

Annotated CCD Image (100% size, linear scale, cropped)
2 x 60s exposure (average combine), 3x3 binning, C Filter
2021-03-29 21:23 UT (#877031-32)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021hdk - CV Type Transient (discovered 2021-03-25)

AT 2021hdk (Ophiuchus)
AT 2021hdk (Type: CV) discovered 2021/03/25.862 UT by XOSS
Alias: XM64HT
Discovery Magnitude 15.71
( Rochester Supernova site | TNS 2021hdk )

AT 2021hdk (T+4.3d)
Reported CV transient (faint) is shown by white cross hairs.

Annotated CCD Image (50% size, linear scale)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2021-03-30 04:00 UT (#877190-94)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021hdk - 2021-03-30 (T+4.3d)
Image below (2021-03-30.165) was taken 4.3 days after discovery of 2021hdk
Reported CV transient is shown by white cross hairs.
Measured Magnitude +16.10

AT 2021hdk - Ref Image
No indication of any object at the position of the
reported transient (shown by mauve cross-hairs)

Reference Image DSS2

AT 2021hfr - Ulens? Transient (discovered 2021-03-26)

AT 2021hfr (Cassiopeia)
AT 2021hfr (Type: ulens?) discovered 2021/03/26.294 UT by Gaia
Alias: Gaia21bnu
Alert triggered at +15.61 (vs historic mag +15.82)
~0.2 mag rise in Gaia galactic plane source -- candidate microlensing event.
( Rochester Supernova site | Gaia21bnu )

AT 2021hfr - 2021-09-20 (T+177.7d)
Image below (2021-09-20.008) was taken 177.7 days after discovery of 2021hfr
Transient Object is shown by white cross hairs.
Measured Magnitude +15.38 (Clear Filter)

Annotated CCD Image (70% size, square root scale)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-09-20 00:21 UT (#914065-69)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021hfr - 2022-01-02 (T+281.7d)
Image below (2022-01-02.006) was taken 281.7 days after discovery of 2021hfr
Transient Object is shown by white cross hairs.
Measured Magnitude +15.3 (Clear Filter)
Linking using detection threshold 80

Annotated CCD Image (70% size, square root scale)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-02 00:18 UT (#947167-71)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021ife - Type CV Transient (discovered 2021-04-05), Attempted Observation

AT 2021ife (Corvus)
AT 2021ife (Type: CV) discovered 2021/04/05.123 UT by BraTS
Alias: BraTS-SON-T2-024
Discovery Magnititude 14.6
(Rochester Supernova site | TNS 2021ife )

AT 2021ife - 2022-01-21 (T+291.1d)
Position of earlier transient (presumed faded / no longer visible) is shown by white circle

Annotated CCD Image (50% size, linear scale)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-21 04:29 UT (#956131-35)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021ife - 2022-01-21 (T+291.1d)
Image below (2022-01-21.180) was taken 291.1 days after discovery of 2021ife
Position of earlier transient (presumed faded / no longer visible) is shown by white circle

Annotated CCD Image (100% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-21 04:29 UT (#956131-35)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2021ife on Transient 2021 Page >>

AT 2021kkh - Type Nova? Transient (discovered 2021-04-22), Attempted Observations

AT 2021kkh (Orion)
AT 2021kkh (Type: Nova?) discovered 2021/04/22.918 UT by BraTS
Alias: BraTS-SON-T2-026
[ TNS 2021kkh ]

AT 2021kkh - Reference Image (DSS2 Color)
No object is visible in DSS2 image at the reported
transient position (shown by purple cross hairs)

DSS2 Image, screen captured via Aladin

AT 2021kkh - Image Sequence x to x

(previous images taken in S942 but are not yet analysed
The earliest of these is still several months after discovery

AT 2021kkh - 2022-01-22 (T+275.0d)
Image below (2022-01-22.888) was taken 275.0 days after discovery of 2021kkh
Position of earlier transient (no longer visible) is shown by white circle

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-22 21:28 UT (#958085-89)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021kkh - 2022-02-06 (T+289.9d)
Image below (2022-02-06.847) was taken 289.9 days after discovery of 2021kkh
Position of earlier transient (no longer visible) is shown by white circle

Annotated CCD Image (100% size, square root scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, C Filter
2022-02-06 20:26 UT (#965016-19)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021kkh - 2022-02-20 (T+303.9d)
Image below (2022-02-20.797) was taken 303.9 days after discovery of 2021kkh
Position of earlier transient (no longer visible) is shown by white circle
(previous images taken in S942, S958 but not yet analysed
The earliest image of these (2021-12-17) is still several months after discovery)

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-02-20 19:17 UT (#973003-07)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT2021kkh on Transients 2021 Page >>

AT 2021aecv - CV Type Transient (discovered 2021-11-09)

AT 2021aecv (Lacerta)
AT 2021aecv (Type: CV) discovered 2021-11-09.661 UT by XOSS
Alias: PSP21ad
Discovery Magnitude 13.99 (Clear Filter)
( TNS 2021aecv )

AT 2021aecv - 2022-11-27 (T+383.3d)
Image below (2022-11-27.992) was taken 383.3 days after discovery of 2021aecv
Position of transient (very faint) is shown by white cross-hairs
Measured Magnitude +17.85 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
3 x 60s exposure (average combine), 3x3 binning, Clear Filter
2022-11-27 23:50 UT (#1063161-63)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021aecv - 2024-08-29 (T+1024.3d)
Image below (2024-08-29.976) was taken 1024.3 days after discovery of 2021aecv
Position of transient (very faint) is shown by white cross-hairs
Measured Magnitude +18.54 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, Clear Filter
2024-08-29 23:28 UT (#1235044-48)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2021aecv on Transients 2021 Page >>

AT 2021aeft - CV Type Transient (discovered 2021-11-09)

AT 2021aeft (Pegasus)
AT 2021aeft (Type: CV) discovered 2021-11-09.667 UT by Gaia
Alias: Gaia21fci, CSS 111021:231909+331540 (Candidate CV/XRB)
Alerting Magnitude 16.62 (G-Gaia Filter)
vs Historic Magnitude 18.30 +/- 0.45 SD
Ouburst in known CV, previously alerted as Gaia15abx (2014-11-21)
( TNS 2021aeft | Gaia21fci )

AT 2021aeft - 2022-01-07 (T+59.1d)
Image below (2022-01-07.745) was taken 59.1 days after discovery of 2021aeft
Position of reported transient (faint) is shown by white cross-hairs
Measured Magnitude TBA (Clear Filter)

Annotated CCD Image (100% size, square root scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2022-01-07 17:56 UT (#950010-14)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021aeft - 2022-11-05 (T+361.3d)
Image below (2022-11-05.924) was taken 361.3 days after discovery of 2021aeft
Position of earlier transient (not visible) is shown by white cross-hairs
Non-Detection, Limiting Magnitude +17.0 (Clear Filter)

Annotated CCD Image (100% size, square root scale, cropped)
4 x 60s exposure (average combine), 3x3 binning, Clear Filter
2022-11-05 22:13 UT (#1055138-42)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021aeft - 2022-11-11 (T+367.2d)
Image below (2022-11-11.899) was taken 367.2 days after discovery of 2021aeft
Position of earlier transient (faint) is shown by white cross-hairs
Measured Magnitude +17.54 (Clear Filter)

Annotated CCD Image (100% size, square root scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, Clear Filter
2022-11-11 21:38 UT (#1057136-40)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021aeft - 2024-09-15 (T+1041.3d)
Image below (2024-09-15.979) was taken 1041.3 days after discovery of 2021aeft
Position of earlier transient (very faint) is shown by white cross-hairs
Measured Magnitude +18.23 (Clear Filter)

Annotated CCD Image (100% size, square root scale, cropped)
4 x 60s exposure (average combine), 3x3 binning, Clear Filter
2024-09-15 23:33 UT (#1244123-27)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021aena - CV Type Transient (discovered 2021-11-11) (Attempt)

AT 2021aena (Corvus)
AT 2021aena (Type: CV) discovered 2021-11-11.846 UT by Gaia
Alias: Gaia21fdi

Transient alert triggered at magnitude +14.56
(vs historic magnitiude +17.51)
( Rochester Supernova site | Gaia21fdi )

Annotated CCD Image (50% size, linear scale)
4 x 60s exposure (average combine), 3x3 binning, C Filter
2021-12-17 06:11 UT (#942351-55)
12" LX200R (at f/10.4) + ST-10XME
Unguided

AT 2021aena - 2021-12-17 (T+35.4d)
Image below (2021-12-17.255) was taken 35.4 days after discovery of 2021aena
Reported position of transient (not visible) is shown by white circle
Star has most-likely faded back to its usual brightness +17.5

Annotated CCD Image (100% size, linear scale, cropped)
Image details as above
Unguided

AT 2021aeoz - CV Type Transient (discovered 2021-11-13) (Attempt)

AT 2021aeoz (Perseus)
AT 2021aeoz (Type: CV) discovered 2021-11-13.841 UT by XOSS
Alias: PSP21ah
Discovery Mag +16.86 (Clear Filter)
( TNS 2021aeoz )

AT 2021aeoz - 2022-11-28 (T+379.2d)
Image below (2022-11-28.059) was taken 379.2 days after discovery of 2021aeoz
Position of earlier transient (faded / not visible) is shown by white cross-hairs

Annotated CCD Image (100% size, linear scale, cropped)
60s exposure (single frame), 3x3 binning, Clear Filter
2022-11-28 01:25 UT (#1063206)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021aeoz - 2022-12-12 (T+393.2d)
Image below (2022-12-12.056) was taken 393.2 days after discovery of 2021aeoz
Position of earlier transient (faded / not visible) is shown by white cross-hairs

Annotated CCD Image (100% size, linear scale, cropped)
4 x 60s exposure (average combine), 3x3 binning, Clear Filter
2022-12-12 01:25 UT (#1068305-08)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021aesn - CV Type Transient (discovered 2021-11-14) (Attempt)

AT 2021aesn (Cetus)
AT 2021aesn (Type: CV) discovered 2021-11-14.136 UT by Gaia
Alias: Gaia21fec
Discovery magnitude 14.59 (G-Gaia) vs Historic Mag 20.67
5.5 mag outburst in CV candidate ASASSN-13bd
CV had fallen back to mag 20.60 on 2021-12-19 (T+35d)
A further outburst was recorded by Gaia approximately
one year later ( 2022-12-29, mag 14.62)
( TNS 2021aesn | Gaia21fec )

AT 2021aesn - 2021-11-19 (T+5.7d)
Image below (2021-11-19.845) was taken 5.7 days after discovery of 2021aesn
Position of reported transient (not visible) is shown by white cross-hairs

Gaia Measurements (from Gaia21fec) indicate that CV Candidate had dimmed back to
historic levels by T+35.5d. But with no measurements between T+0.25d and T35.5d
there is uncertainity over the rate at which the CV Candidate dimmed.

From the image below it is likely that star had returned to close to
historic levels by T+5.7d and this indicates that the dimming was fairly quick.
2021-11-02 03:09:55 UT, mag 20.86 (T-12.0d)
2021-11-14 03:16:36 UT, mag 14.59 (T+0.00d)
2021-11-14 05:03:10 UT, mag 14.54 (T+0.07d)
2021-11-14 09:16:49 UT, mag 14.66 (T+0.25d)
2021-12-19 14:39:53 UT, mag 20.60 (T+35.5d) ]

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2021-11-19 20:20 UT (#935101-05)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021aesn - 2022-09-19 (T+309.0d)
Image below (2022-09-19.091) was taken 309.0 days after discovery of 2021aesn
Position of earlier transient (no longer visible) is shown by white cross-hairs

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, Clear Filter
2022-09-19 02:14 UT (#1039263-67)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021aesn - 2023-10-04 (T+689.8d)
Image below (2023-10-04.963) was taken 689.8 days after discovery of 2021aesn
Position of earlier transient (no longer visible) is shown by white cross-hairs

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, Clear Filter
2023-10-04 23:09 UT (#1154074-78)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021afdl - CV Type Transient (discovered 2021-11-22)

AT 2021afdl (Pegasus)
AT 2021afdl (Type: CV) discovered 2021-11-22.240 UT by Gaia
Alias: Gaia21fgm
Alerting magnitude 15.22 (vs Historic magnitude 18.78)
Outburst in candidate CV, previous outburst reported
in Gaia15abf (disc. 2014-11-21 02:2, mag 15.28)
(Further outburst seen in Gaia data 2021-01-17 19:35, mag 15.54)
( TNS 2021afdl | Gaia21fgm )

AT 2021afdl - 2022-12-31 (T+404.5d)
Image below (2022-12-31.739) was taken 404.5 days after discovery of 2021afdl
Position of earlier reported transient (not visible) is shown by white circle
Object is likely at it's normal (non-outburst) magnitude level

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, Clear Filter
2022-12-31 17:48 UT (#1079022-26)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021afdl - 2023-10-22 (T+699.7d)
Image below (2023-10-22.929) was taken 699.7 days after discovery of 2021afdl
Position of earlier reported transient (very faint) is shown by white cross-hairs
Measured Magnitude +18.98 (Clear Filter)
Object is at it's normal (non-outburst) magnitude level

Annotated CCD Image (100% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2023-10-22 22:26 UT (#1158114-18)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021afdl - 2024-09-13 (T+1025.8d)
Image below (2024-09-13.031) was taken 1025.8 days after discovery of 2021afdl
Position of earlier transient (not visible or barely visible ?) is shown by white cross-hairs
Non-Detection Limiting Magnitude +19.5 (Clear Filter)
Object is likely at it's normal lowstand magnitude level (mag 19.2 to 20.0)

Annotated CCD Image (100% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2024-09-13 00:52 UT (#1242103-07)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agbq - Type ulens? Transient (discovered 2021-12-02)

AT 2021agbq (Cygnus)
AT 2021agbq (Type: ulens?) discovered 2021-12-02.662 UT by Gaia
Alias: Gaia21fka
Alerting Magnitude 13.94 (vis historic mag 14.20)
Bright red gal.plane source candidate microlensing event or Be-type outburst rises by 0.3 mag
( TNS 2021agbq | Gaia21fka )

AT 2021agbq - 2022-04-23 (T+141.4d)
Image below (2022-04-23.109) was taken 141.4 days after discovery of 2021agbq
Position of transient object (visible) is shown by white cross-hairs
Measured magnitude +13.88

Annotated CCD Image (100% size, linear scale, cropped)
180s exposure (single frame), 3x3 binning, C Filter
2022-04-23 02:40 UT (#1003121)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021kmb - Transient (discovered 2021-04-22) (Attempt)

AT 2021kmb (Virgo)
AT 2021kmb (Type: *) discovered 2021/04/22.146 UT by Pierluigi Catizone
Alias: AT2020lrn
(Rochester Supernova site )

AT 2021kmb - 2021-05-06 (T+13.9d)
Image below (2021-05-06.019) was taken 13.9 days after discovery of 2021kmb
Position of reported transient (not visible) is shown by white cross-hairs
No object is evident at the reported position. Transient has seemingly faded
Glare at bottom of image is from HIP 68215 (mag 7.1) which lies just outside FOV

Annotated CCD Image (100% size, square root scale, cropped)
180s exposure (single frame), 3x3 binning, C Filter
2021-05-06 00:27 UT (#894069)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021kmb - 2022-01-21 (T+274.0d)
Image below (2022-01-21.149) was taken 274.0 days after discovery of 2021kmb
Position of earlier transient (not visible) is shown by white cross-hairs
No object is evident at the reported position
Transient has probably faded and is no longer visible.

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-21 03:44 UT (#956117-21)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021kmb - 2022-01-28 (T+281.0d)
Image below (2022-01-28.193) was taken 281.0 days after discovery of 2021kmb
Position of earlier transient (not visible) is shown by white cross-hairs
No object is evident at the reported position
Transient has probably faded and is no longer visible.

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-28 04:47 UT (#960124-28)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021kmb - 2022-02-13 (T+296.9d)
Image below (2022-02-13.036) was taken 296.9 days after discovery of 2021kmb
Position of earlier transient (not visible) is shown by white cross-hairs
No object is evident at the reported position
Transient has probably faded and is no longer visible.

Annotated CCD Image (100% size, square root scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, C Filter
2022-02-13 01:04 UT (#970041-43)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021koz - Type QSO? Transient (discovered 2021-04-28)

AT 2021koz (Aquarius)
AT 2021koz (Type: QSO?) discovered 2021-04-28.220 UT by MASTER
Alias: MASTER OT J211634.43-015312.7
Discovery Magnitude 14.19 (r-ZTF Filter)
( Rochester Supernova site | Discovery Image ) | ZTF19aaywash )
( TNS 2021koz )

(see https://lasair.roe.ac.uk/lasair/static/ztf/stamps/jpg/1494/candid1494161754615015005.jpg )

AT 2021koz - 2021-09-29 (T+154.6d)
Image below (2021-09-29.859) was taken 154.6 days after discovery of 2021koz
Position of earlier transient position (now faded & no longer visible)
is shown approximately by white cross hairs.

Annotated CCD Image (125% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-09-29 20:46 UT (#918040-44)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT2021wuy - Type CV Transient (discovered 2021-08-22) - Attempt

AT2021wuy (Auriga)
AT2021wuy (Type: CV) discovered 2021-08-22.291 UT by Gaia
Alias: Gaia21dxt
Transient alert triggered by 2.5 mag rise in magnitude from +19.4 to +16.9
[ Gaia21dxt ]

AT2021wuy - 2021-11-17 (T+86.7d)
Reported position of AT2021wuy is shown by white circle

Annotated CCD Image (50% size, linear scale)
4 x 60s exposure (average combine), 3x3 binning, C Filter
2021-11-17 00:09 UT (#934072-76)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021wuy - 2021-09-20 (T+28.8d)
Image below (2021-09-20.122) was taken 28.8 days after discovery of 2021wuy
Position of reported transient (not visible) is shown by white cross-hairs
Object has likely faded back to its historic magnitude of +19.4

Annotated CCD Image (125% size, linear scale)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2021-09-20 02:59 UT (#914173-77)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT2021wuy - 2021-11-17 (T+86.7d)
Image below (2021-11-17.004) was taken 86.7 days after discovery of 2021wuy

Star shown by white cross-hairs may or may not be AT2021wuy
Measured magnitude +14.8 (vs catalog mag +15.4 in UCA/USNO2)

Adjacent faint star has estimated mag of +16.8 and might be AT2021wuy instead.
Alternatively AT2021wuy might be a third star (not visible) that has faded back
to its historic magnitude of +19.4

Annotated CCD Image (125% size, linear scale)
4 x 60s exposure (average combine), 3x3 binning, C Filter
2021-11-17 00:09 UT (#934072-76)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Negative CCD Image (125% size, linear scale)
Image details as above

Reference picture for Gaia21dxt
Aladin Insert on gsaweb's Gaia21dxt web page

AT 2021wxe - CV Type Transient (discovered 2021-08-23)

AT 2021wxe (Taurus)
AT 2021wxe (Type: CV) discovered 2021-08-23.622 UT by Gaia
Alias: Gaia21dyv
Discovery Magnitude 15.82 (G-Gaia Filter)
vs Historic Magnitude 17.06 +/- 0.23 SD
Outburst in candidate CV ASASSN-15pq
[ TNS 2021wxe | Gaia21dyv ]

AT 2021wxe - 2021-09-20 (T+27.5d)
Image below (2021-09-20.087) was taken 27.5 days after discovery of 2021wxe
Position of reported transient (faint) is shown by white cross-hairs
Measured Magnitude +16.73 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
2 x 60s exposure (average combine), 3x3 binning, C Filter
2021-09-20 02:06 UT (#914138-39)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021xbh - Type Nova? Transient (discovered 2021-08-27) (Attempt)

AT 2021xbh (Camelopardalis)
AT 2021xbh (Type: Nova?) discovered 2021-08-27.873 UT by XOSS
Alias: KATS21Q001
( Rochester Supernova site | KATS21Q001 Image )

Annotated CCD Image (50% size, linear scale)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2021-12-16 22:35 UT (#942117-21)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021xbh - Detail, 2021-12-16 (T+111.1d)
Image below (2021-12-16.935) was taken 111.1 days after discovery of 2021xbh
Position of earlier transient (no longer visible) is shown by white circle

Annotated CCD Image (100% size, linear scale, cropped)
Image details as above

AT 2021xmw - Type YSO Transient, V546 Mon (discovered 2021-08-30)

AT 2021xmw (Monoceros)
AT 2021xmw (Type: YSO) discovered 2021-08-30.807 UT by Gaia
Alias: Gaia21ebu, V546 Mon
Alerting magnitude 15.25 (vs Historic magnitude 16.26)
1 magnitude brightening of Orion variable V546 Mon
( TNS 2021xmw | Gaia21ebu )

Annotated CCD Image (50% size, square root scale)
2 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-09 23:50 UT (#952150-51)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021xmw - 2021-10-23 (T+53.3d)
Image below (2021-10-23.105) was taken 53.3 days after discovery of 2021xmw
Position of V546 Mon (faint) is shown by white cross-hairs
Measured Magnitude +15.04 (Clear Filter)

Annotated CCD Image (125% size, linear scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2021-10-23 02:38 UT (#926139-42)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Annotated negative CCD Image (125% size, square root scale, cropped)
Image details as above

AT 2021xmw / V546 Mon - 2022-01-09 (T+132.2d)
Image below (2022-01-09.990) was taken 132.2 days after discovery of 2021xmw
Position of V546 Mon (faint) is shown by white cross-hairs

Annotated CCD Image (125% size, square root scale, cropped)
2 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-09 23:50 UT (#952150-51)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Annotated negative CCD Image (125% size, square root scale, cropped)
Image details as above

AT 2021xrf - Type CV? Transient (discovered 2021-09-02) - Attempt

AT 2021xrf (Perseus)
AT 2021xrf (Type: CV) discovered 2021-09-02.359 UT by Kumar
Alias: GEOTS-2021-022
Discovery Mag +13.5
( Rochester Supernova site | TNS 2021xrf )

AT 2021xrf - 2021-10-05 (T+32.7d)
Image below (2021-10-05.038) was taken 32.7 days after discovery of 2021xrf
Position of reported transient (not visible) is shown by white circle
Transient is presumed to have faded back to normal level

Annotated CCD Image (125% size, square root scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, C Filter
2021-10-05 01:00 UT (#921152-54)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021xrf - 2021-10-15 (T+42.8d)
Image below (2021-10-15.165) was taken 42.8 days after discovery of 2021xrf
Position of reported transient (not visible) is shown by white circle
Transient is presumed to have faded back to normal level
Poor quality image (poor sky transparency, single frame)

Annotated CCD Image (125% size, square root scale, cropped)
180s exposure (single frame), 3x3 binning, C Filter
2021-10-15 03:57 UT (#925158)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021xrf - 2021-12-29 (T+118.5d)
Image below (2021-12-29.883) was taken 118.5 days after discovery of 2021xrf
Position of reported transient (not visible) is shown by white circle
Transient is presumed to have faded to normal level

Annotated CCD Image (125% size, square root scale, cropped)
2 x 180s exposure (average combine), 3x3 binning, C Filter
2021-12-29 21:16 UT (#946026-27)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021xrf - 2022-01-05 (T+125.5d)
Image below (2022-01-05.873) was taken 125.5 days after discovery of 2021xrf
Position of reported transient (not visible) is shown by white circle
Transient is presumed to have faded to normal level

Annotated CCD Image (125% size, square root scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-05 21:04 UT (#949053-56)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021xrf - 2022-01-09 (T+129.5d)
Image below (2022-01-09.860) was taken 129.5 days after discovery of 2021xrf
Position of reported transient (not visible) is shown by white cross-hairs
Transient is presumed to have faded to normal level

Annotated CCD Image (125% size, square root scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-09 20:46 UT (#952110-13)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021yel - CV Type Transient (discovered 2021-09-05)

AT 2021yel (Lyra)
AT 2021yel (Type: CV) discovered 2021-09-05.712 UT by Gaia
Alias: Gaia21edo
Discovery Magnitude 16.18 (g-Gaia Filter)
Outburst of confirmed CV TCP J19092450+3041330
( TNS 2021yel | Gaia21edo )

AT 2021yel - 2021-10-25 (T+50.1d)
Image below (2021-10-25.803) was taken 50.1 days after discovery of 2021yel
Position of earlier transient (not visible) is shown by white cross hairs.

Annotated CCD Image (125% size, square root scale, cropped)
4 x 60s exposure (average combine), 3x3 binning, C Filter
2021-10-25 19:19 UT (#928022-26)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2021yel on Transients 2021 Page >>

AT 2021yjl - CV Type Transient (discovered 2021-09-06) - Attempt

AT 2021yjl (Draco)
AT 2021yjl (Type: CV) discovered 2021-09-06.981 UT by Gaia
Alias: Gaia21eem
Discovery Magnitude 15.25 (G-Gaia Filter)
vs Historic Magnitude 17.92 +/- 1.15 SD
Outburst of known CV 1RXS J185310.0+594509
( TNS 2021yjl | Gaia21eem )

AT 2021yjl - 2021-09-21 (T+14.9d)
Image below (2021-09-21.918) was taken 14.9 days after discovery of 2021yjl
Position of reported transient (not visible) is indicated by white cross-hairs
Non-Detection Limiting Magnitude +18.0 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
3 x 60s exposure (average combine), 3x3 binning, C Filter
2021-09-21 22:04 UT (#915115-17)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021yjl - 2021-09-21 (T+14.9d), Detail
Position of reported transient (not visible) is indicated by black cross-hairs

Annotated negative CCD Image (100% size, square root scale, cropped)
3 x 60s exposure (average combine), 3x3 binning, C Filter
2021-09-21 22:04 UT (#915115-17)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021zkf - YSO Transient, V0645 Cyg (discovered 2021-09-13)

AT 2021zkf / V0645 Cyg (Cygnus)
AT2021zkf (Type: YSO) discovered 2021-09-13.232 UT by Gaia
Alias: Gaia21ego, GCVS V0645 Cyg
Triggering Magnitude 11.16 (G-Gaia Filter)
vs Historic Magnitude 12.14 +/- 0.29 SD
Slow rise of known YSO V645 Cyg, 1 mag in over 5 years
( TNS 2021zkf | Gaia21ego )

V0645 Cyg / AT2021zkf

Annotated CCD Image (50% size, linear scale)
2 x 180s exposure (average combine), 3x3 binning, C Filter
2021-11-28 22:06 UT (#938050-51)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021zkf - 2021-10-04 (T+20.8d)
Image below (2021-10-04.024) was taken 20.8 days after discovery of 2021zkf
Position of transient (distinct) is shown by white cross-hairs
Estimated Magnitude +10.4 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, C Filter
2021-10-04 00:41 UT (#920081-84)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021zkf - 2021-10-04 (T+21.7d)
Image below (2021-10-04.932) was taken 21.7 days after discovery of 2021zkf
Position of transient (distinct) is shown by white cross-hairs
Measured Magnitude +11.49 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2021-10-04 22:31 UT (#921071-75)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021zkf - 2021-10-10 (T+26.9d)
Image below (2021-10-10.118) was taken 26.9 days after discovery of 2021zkf
Position of transient (distinct) is shown by white cross-hairs
Measured Magnitude +11.24 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, C Filter
2021-10-10 02:57 UT (#922083-85)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021zkf - 2021-10-22 (T+39.8d)
Image below (2021-10-22.984) was taken 39.8 days after discovery of 2021zkf
Position of transient (distinct, brightening) is shown by white cross-hairs
Measured Magnitude +11.03 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-10-22 23:46 UT (#926122-26)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021zkf - 2021-10-24 (T+41.8d)
Image below (2021-10-24.999) was taken 41.8 days after discovery of 2021zkf
Position of transient (distinct, fading) is shown by white cross-hairs
Measured Magnitude +11.41 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2021-10-25 00:06 UT (#927045-49)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021zkf - 2021-10-25 (T+42.6d)
Image below (2021-10-25.811) was taken 42.6 days after discovery of 2021zkf
Position of transient (distinct, fading) is shown by white cross-hairs
Measured Magnitude +11.50 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-10-25 19:37 UT (#928029-33)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

V0645 Cyg / AT2021zkf - 2021-11-28 (T+76.7d)
Image below (2021-11-28.912) was taken 76.7 days after discovery of 2021zkf
Star is shown by white cross-hairs
Measured Magnitude +11.55 (Clear Filter)

CCD Image (100% size, linear scale, cropped)
2 x 180s exposure (average combine), 3x3 binning, C Filter
2021-11-28 22:06 UT (#938050-51)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021aagc - HPM Type Transient (discovered 2021-09-26)

AT 2021aagc (Auriga)
AT 2021aagc (Type: HPM) discovered 2021-09-26.036 UT by MASTER
Alias: MASTER OT J071112.22+432945.9
Discovery Mag +13.7
vs Historical Mag > +20.3 (2010)
HPM = High Proper Motion ?
[ TNS 2021aagc ]

AT 2021aagc (T+134.8d)

Annotated CCD Image (50% size, square root scale)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-02-07 19:37 UT (#966029-33)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021aagc - 2021-10-10 (T+14.2d)
Image below (2021-10-10.190) was taken 14.2 days after discovery of 2021aagc
Position of reported transient (distinct) is shown by white cross hairs.
Measured magnitude +13.85 (Clear Filter)

Annotated CCD Image (100% size, square root scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, C Filter
2021-10-10 04:40 UT (#922123-25)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021aagc - 2022-02-07 (T+134.8d)
Image below (2022-02-07.811) was taken 134.8 days after discovery of 2021aagc
Reported transient is shown by white cross hairs.
Measured magnitude +14.0

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-02-07 19:37 UT (#966029-33)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021aagc - 2022-02-09 (T+136.8d)
Image below (2022-02-09.838) was taken 136.8 days after discovery of 2021aagc
Reported transient is shown by white cross hairs.
Measured magnitude +13.89

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-02-09 20:16 UT (#968067-71)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021aagc - 2022-01-27 (T+123.9d)
Image below (2022-01-27.918) was taken 123.9 days after discovery of 2021aagc
Reported transient is shown by white cross hairs.
Measured magnitude +14.06

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-27 22:12 UT (#960051-55)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021aagc - 2022-03-05 (T+160.9d)
Image below (2022-03-05.901) was taken 160.9 days after discovery of 2021aagc
Reported transient is shown by white cross hairs.
Measured magnitude +13.95

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-03-05 21:47 UT (#982071-75)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021aagc - Reference Image (DSS2 Color)
Reported transient position is shown by purple cross hairs.
The transient appears to be a stellar object that has moved position since the DSS2 image was taken

DSS2 Image, screen captured via Aladin

AT 2021agdc - CV Type Transient (discovered 2021-12-05)

AT 2021agdc (Vulpecula)
AT 2021agdc (Type: CV) discovered 2021-12-05.154 UT by Gaia
Alias: Gaia21fld
Alerting Magnitude 10.14 (g-GAIA Filter) vs Historic Magnitude 10.45 +/- 0.06)
Bright blue gal.plane source candidate microlensing event
or Be-type outburst rises by 0.3 mag
( TNS 2021agdc | Gaia21fld)

AT 2021agdc - 2023-04-20 (T+501.0d)
Image below (2023-04-20.123) was taken 501.0 days after discovery of 2021agdc
Position of reported CV Transient (not visible / likely faded) is shown by white cross-hairs

Annotated CCD Image (100% size, linear scale, cropped)
4 x 60s exposure (average combine), 3x3 binning, Clear Filter
2023-04-20 03:00 UT (#1115157-61)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2021agdc on Transients 2021 Page >>

AT 2021agdj - CV Type Transient (discovered 2021-12-05)

AT 2021agdj (Sagitta)
AT 2021agdj (Type: CV) discovered 2021-12-05.977 UT by Gaia
Alias: Gaia21flm
Discovery Magnitude 15.23 (G-Gaia Filter)
vs Historical Magnitude 15.49 +/- 0.02 SD
Gaia source brightens by ~0.3 mag
( TNS 2021aecv | Gaia21flm )

AT 2021agdj - 2024-08-31 (T+1000.0d)
Image below (2024-08-31.959) was taken 1000.0 days after discovery of 2021agdj
Position of transient (faint) is shown by white cross-hairs
Measured Magnitude +15.72 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
4 x 60s exposure (average combine), 3x3 binning, Clear Filter
2024-08-31 23:04 UT (#1237074-78)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021aggy - CV Type Transient (discovered 2021-12-12)

AT 2021aggy (Aquila)
AT 2021aggy (Type: CV) discovered 2021-12-12.396 UT by Gaia
Alias: Gaia21fno
Alerting Magnitude 15.74 (G-Gaia Filter)
vs Historic Magnitude 15.91 +/-0.06 SD
Gaia source brightens by 0.2 mag over 17 months
( TNS 2021aggy | Gaia21fno )

AT 2021aggy - 2024-10-19 (T+1042.5d)
Image below (2024-10-19.847) was taken 1042.5 days after discovery of 2021aggy
Positon of earlier transient (faint) is shown by white cross hairs.
Measured magnitude +15.52 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, Clear Filter
2024-10-19 20:22 UT (#1257102-06)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2021aggy on Transients 2021 Page >>

AT 2021agjs - Ulens? Transient (discovered 2021-12-16)

AT 2021agjs (Puppis)
AT 2021agjs (Type: ulens?) discovered 2021-12-16.612 UT by Gaia
Alias: Gaia21fpg, GSC 5404:2476
Alert triggered at +10.55 (vs historic mag +10.82)
bright gal.plane source candidate microlensing event or Be-type outburst rises by 0.3 mag
( Rochester Supernova site | Gaia21fpg )

AT 2021agjs / GSC 5404:2476 (T+16.4d)

Annotated CCD Image (70% size, square root scale)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-02 01:03 UT (#947181-85)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agjs / GSC 5404:2476 - 2022-01-02 (T+16.4d)
Image below (2022-01-02.037) was taken 16.4 days after discovery of 2021agjs
Transient Object is shown by white cross hairs.
Measured Magnitude +11.53

Annotated CCD Image (100% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-02 01:03 UT (#947181-85)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agjs / GSC 5404:2476 - 2022-01-04 (T+18.4d)
Image below (2022-01-04.058) was taken 18.4 days after discovery of 2021agjs
Transient Object is shown by white cross hairs.
Measured Magnitude +11.24

Annotated CCD Image (100% size, linear scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-04 01:30 UT (#948127-29)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agjs - 2022-01-08 (T+22.4d)
Image below (2022-01-08.052) was taken 22.4 days after discovery of 2021agjs
Transient Object is shown by white cross hairs.
Measured Magnitude +10.95

Annotated CCD Image (100% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-08 01:24 UT (#950176-80)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agjs - 2022-01-09 (T+23.4d)
Image below (2022-01-09.051) was taken 23.4 days after discovery of 2021agjs
Transient Object is shown by white cross hairs.
Measured Magnitude +11.17

Annotated CCD Image (100% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-09 01:22 UT (#951010-14)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agrm - Type HPM Transient (discovered 2021-12-25)

AT 2021agrm (Eridanus)
AT 2021agrm (Type: HPM) discovered 2021-12-25.090 UT by Gaia
Alias: Gaia21ftx
( TNS 2022agrm , Gaia21ftx)

AT 2021agrm - 2022-11-21 (T+331.0d)
Image below (2022-11-21.056) was taken 331.0 days after discovery of 2021agrm
Position of reported transient is shown by white cross-hairs
Some uncertainty on target due Linking Failure
(3 parallel satellite tracks cross the image)

Annotated CCD Image (100% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2022-11-21 01:29 UT (#1059228-32)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agpw - CV Type Transient (discovered 2021-12-27)

AT 2021agpw (CV) (Serpens)
AT 2021agpw (Type: CV) discovered 2021-12-27.275 UT by MASTER
Alias: MASTER OT J155629.78+090149.3
Discovery Mag 10.1 (red long variability ?)
[ TNS 2021agpw ]

AT 2021agpw (T+43.0d)

Annotated CCD Image (50% size, linear scale)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2022-02-08 06:15 UT (#966118-22)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agpw - Reference Image (DSS2 Color)
Reported transient position is shown by purple cross hairs.
Object is clearly less bright in this reference image compared to the object in the latest image above

DSS2 Image, screen captured via Aladin

AT 2021agpw - 2022-01-06 (T+9.9d)
Image below (2022-01-06.189) was taken 9.9 days after discovery of 2021agpw
Reported transient is shown by white cross hairs.
Measured magnitude +10.53

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2022-01-06 04:35 UT (#949106-10)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agpw - 2022-01-09 (T+13.0d)
Image below (2022-01-09.256) was taken 13.0 days after discovery of 2021agpw
Reported transient is shown by white cross hairs.
Measured magnitude +10.58

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2022-01-09 06:12 UT (#951125-29)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agpw - 2022-01-11 (T+15.0d)
Image below (2022-01-11.263) was taken 15.0 days after discovery of 2021agpw
Reported transient is shown by white cross hairs.
Measured magnitude +10.54

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2022-01-11 06:22 UT (#953055-59)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agpw - 2022-01-14 (T+18.0d)
Image below (2022-01-14.251) was taken 18.0 days after discovery of 2021agpw
Reported transient is shown by white cross hairs.
Measured magnitude +10.56

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2022-01-14 06:04 UT (#954104-08)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agpw - 2022-01-21 (T+25.0d)
Image below (2022-01-21.229) was taken 25.0 days after discovery of 2021agpw
Reported transient is shown by white cross hairs.
Measured magnitude +10.81

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2022-01-21 05:33 UT (#956152-56)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agpw - 2022-01-26 (T+29.9d)
Image below (2022-01-26.205) was taken 29.9 days after discovery of 2021agpw
Reported transient is shown by white cross hairs.
Measured magnitude +10.82

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2022-01-26 04:58 UT (#959185-89)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agpw - 2022-02-05 (T+39.9d)
Image below (2022-02-05.160) was taken 39.9 days after discovery of 2021agpw
Reported transient is shown by white cross hairs.
Measured magnitude +11.07

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2022-02-05 03:54 UT (#963224-28)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agpw (CV) - 2022-02-08 (T+43.0d)
Image below (2022-02-08.258) was taken 43.0 days after discovery of 2021agpw
Reported transient is shown by white cross hairs.
Measured magnitude +11.25

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2022-02-08 06:15 UT (#966118-22)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agpw - 2022-02-10 (T+44.9d)
Image below (2022-02-10.144) was taken 44.9 days after discovery of 2021agpw
Reported transient (bright) is shown by white cross hairs.
Measured magnitude +11.26

Annotated CCD Image (100% size, linear scale, cropped)
4 x 60s exposure (average combine), 3x3 binning, C Filter
2022-02-10 03:30 UT (#968232-35)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agpw - 2022-02-24 (T+58.9d)
Image below (2022-02-24.144) was taken 58.9 days after discovery of 2021agpw
Reported transient is shown by white cross hairs.
Measured magnitude +11.68
Poor quality image (bad seeing/wind)

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2022-02-24 03:31 UT (#976182-86)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agpw - 2022-03-06 (T+68.9d)
Image below (2022-03-06.169) was taken 68.9 days after discovery of 2021agpw
Reported transient is shown by white cross hairs.
Measured magnitude +12.09

Annotated CCD Image (100% size, linear scale, cropped)
4 x 60s exposure (average combine), 3x3 binning, C Filter
2022-03-06 04:07 UT (#982222-26)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agpw - 2022-03-17 (T+79.9d)
Image below (2022-03-17.161) was taken 79.9 days after discovery of 2021agpw
Reported transient is shown by white cross hairs.
Measured magnitude +12.39

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2022-03-17 03:55 UT (#986025-29)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agpw - 2022-03-18 (T+80.7d)
Image below (2022-03-18.022) was taken 80.7 days after discovery of 2021agpw
Reported transient is shown by white cross hairs.
Measured magnitude +12.25

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2022-03-18 00:35 UT (#987145-49)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agpw - 2022-03-23 (T+85.8d)
Image below (2022-03-23.103) was taken 85.8 days after discovery of 2021agpw
Reported transient is shown by white cross hairs.
Measured magnitude +12.22

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2022-03-23 02:31 UT (#992164-68)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agpw - 2022-03-24 (T+86.9d)
Image below (2022-03-24.163) was taken 86.9 days after discovery of 2021agpw
Reported transient is shown by white cross hairs.
Measured magnitude +12.41

Annotated CCD Image (100% size, linear scale, cropped)
3 x 60s exposure (average combine), 3x3 binning, C Filter
2022-03-24 03:57 UT (#993164-66)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agpw (CV) - 2022-03-25 (T+87.8d)
Image below (2022-03-25.090) was taken 87.8 days after discovery of 2021agpw
Reported transient is shown by white cross hairs.
Measured magnitude +12.55

Annotated CCD Image (100% size, linear scale, cropped)
3 x 60s exposure (average combine), 3x3 binning, C Filter
2022-03-25 02:15 UT (#994106-08)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agpw - 2022-04-01 (T+94.8d)
Image below (2022-04-01.098) was taken 94.8 days after discovery of 2021agpw
Reported transient is shown by white cross hairs.
Measured magnitude +12.75

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2022-04-01 02:24 UT (#997058-62)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agpw - 2022-05-11 (T+135.7d)
Image below (2022-05-11.990) was taken 135.7 days after discovery of 2021agpw
Reported transient is shown by white cross hairs.
Measured magnitude +13.15

Annotated CCD Image (100% size, linear scale, cropped)
4 x 60s exposure (average combine), 3x3 binning, C Filter
2022-05-11 23:50 UT (#1009048-52)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agpw - 2022-05-15 (T+138.8d)
Image below (2022-05-15.047) was taken 138.8 days after discovery of 2021agpw
Reported transient is shown by white cross hairs.
Measured magnitude +13.14
Poor quality due to thin cloud & bright moon lit sky

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2022-05-15 01:10 UT (#1010042-46)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agpw - 2024-04-11 (T+835.9d)
Image below (2024-04-11.144) was taken 835.9 days after discovery of 2021agpw
Reported transient (brightened again) is shown by white cross hairs.
Measured magnitude +10.42

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, Clear Filter
2024-04-11 03:31 UT (#1206118-22)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agxs - CV Type Transient Star (discovered 2021-12-28)

AT 2021agxs (Gemini)
AT 2021agxs (Type: CV) discovered 2021-12-28.532 UT by Tadashi Kojima
Alias: TCP J07094936+1412280
Magnitude +13.6 at discovery. Possible CV
[ TNS 2021agxs ]

AT 2021agxs - 2022-01-21 (T+24.4d)
Image below (2022-01-21.927) was taken 24.4 days after discovery of 2021agxs
Reported transient is shown by white cross hairs.
Measured magnitude +15.1 (fading)

Annotated CCD Image (100% size, linear scale, cropped)
4 x 60s exposure (average combine), 3x3 binning, C Filter
2022-01-21 22:18 UT (#957160-64)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agxs - Reference Image (DSS2 Color)
Reported transient position is shown by purple cross hairs.
No object is evident at reported position.

DSS2 Image, screen captured via Aladin

AT2021agxs - 2022-02-04 (T+38.4d)
Image below (2022-02-04.963) was taken 38.4 days after discovery of 2021agxs
Position of earlier transient (now significantly faded) is shown by white cross hairs.

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2022-02-04 23:10 UT (#963116-20)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Annotated CCD Image (200% size, linear scale, cropped)
Image details as above

AT 2021agxs - 2022-11-29 (T+335.5d)
Image below (2022-11-29.032) was taken 335.5 days after discovery of 2021agxs
Position of earlier transient (not visible) is shown by white cross hairs.

Annotated CCD Image (100% size, linear scale, cropped)
4 x 60s exposure (average combine), 3x3 binning, Clear Filter
2022-11-29 00:50 UT (#1064273-76)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Extragalactic Transients

M31 Transients (2021)

AT 2021fbz - Extragalactic Nova (discovered 2021-03-08) in M31 (Attempt)

M31 with Nova 2021fbz (Andromeda)
AT 2021fbz (Type: EGN) discovered 2021/03/08.397 UT by Koichi Itagaki
Alias: PNV J00434013+4127123, XN03JR
Discovery Magnitude 16.5
(Rochester Supernova site | TNS 2021fbz | Discovery Image )

M31 with Nova 2021fbz (T+8.5d)
Position of EGN (very faint / barely distinguishable) is shown by white cross hairs.

Annotated CCD Image (50% size, square root scale)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-16 20:51 UT (#871017-20)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

M31 with Nova 2021fbz - Image Sequence (T+5.5d to T+14.4d)
T0 = 2021-03-08.397

M31 with Nova 2021fbz - 2021-03-13 (T+5.5d)
Image below (2021-03-13.857) was taken 5.5 days after discovery of 2021fbzj
Transient's reported position is shown by white circle.
No indication of any object at the reported position. Nova is unconfirmed

Annotated CCD Image (100% size, square root scale, cropped)
2 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-13 20:43 UT (#869011-15)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

M31 with Nova 2021fbz - 2021-03-16 (T+8.5d)
Image below (2021-03-16.864) was taken 8.5 days after discovery of 2021fbz
Position of EGN (very faint) is shown by white cross hairs.

Annotated CCD Image (100% size, square root scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-16 20:51 UT (#871017-20)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

M31 with Nova 2021fbz - Negative (T+8.5d)
Position of EGN (very faint) is shown by black cross hairs.

Annotated negative CCD Image (150% size, square root scale, cropped)
Image details as above

M31 with Nova 2021fbz - 2021-03-17 (T+9.5d)
Image below (2021-03-17.865) was taken 9.5 days after discovery of 2021fbz
Position of EGN (very faint) is shown by white cross hairs.
Poor quality image (developing cloud / single frame )

Annotated CCD Image (100% size, square root scale, cropped)
180s exposure (single frame), 3x3 binning, C Filter
2021-03-17 20:48 UT (#872009)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

M31 with Nova 2021fbz - 2021-03-22 (T+14.4d)
Image below (2021-03-22.844) was taken 14.4 days after discovery of 2021fbzj
Transient's reported position is shown by white circle..

Annotated CCD Image (100% size, log scale cropped)
Image details as above

AT 2021zdh - Transient (discovered 2021-09-18) in M31

M31 with AT 2021zdh (Andromeda)
AT 2021zdh (Type: unk) discovered 2021-09-18.608 UT by XOSS
Alias: XM58MZ, PNV J00424123+4114322
Discovery Magnitude 18.4 (Clear Filter)
vs Prior Non-Detection Limiting Magnitude 19.0
(Rochester Supernova site | Rochester EGN Page | http://xjltp.china-vo.org/xm58mz.html)
( TNS 2021zdh )

M31 with AT 2021zdh - 2021-09-28 (T+9.4d)
Image below (2021-09-28.017) was taken 9.4 days after discovery of 2021zdh
Transient's reported position is shown by white circle

Annotated CCD Image (70% size, log scale)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-09-28 00:33 UT (#917205-09)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

M31 with AT 2021zdh - Detail
Transient's reported position is shown by white circle
Background near to M31 nucleus is too bright to show the transient
which in any case may have faded since its discovery

Annotated CCD Image (150% size, log scale)
Image details above

AT 2021aaxp - CV Type Transient (discovered 2021-10-09) in M31

M31 with AT2021aaxp (Andromeda)
AT2021aaxp (Type: CV) discovered 2021-10-09.613 UT by Balam
Alias: PNV J00444033+4113068
Discovery Magnitude 17.77 (G-Gaia Filter)
Spectrum indicates this object is not a nova in M31 but a
CV in the Milky Way Galaxy (TNS 2021aaxp classification)
Rochester EGN Page | Klaus Wenzel image | TNS 2021aaxp )

M31 with AT2021aaxp
Image taken with secondary scope showing position of reported transient (blue circle)
relative to outline of M31 galaxy (white ellipse) & M31 Galaxy centre (labelled)

CMOS Image (16% size)
10s exposure (stacked), 1x1 binning
2021-10-15 01:30 UT (#Cam2_Ref)
TS 80mm APO, ZWO ASI178MC & PHD2

M31 with AT2021aaxp (T+5.4d)
Position of reported transient is shown by white cross-hairs
FOV of CCD Images is shown by yellow rectangle in wider view CMOS image above

Annotated CCD Image (50% size, square root scale)
3 x 60s exposure (average combine), 3x3 binning, C Filter
2021-10-15 00:35 UT (#925084-86)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

M31 with AT 2021aaxp - 2021-10-15 (T+5.4d)
Image below (2021-10-15.023) was taken 5.4 days after discovery of 2021aaxp
Position of reported transient (faint) is shown by white cross-hairs

Annotated CCD Image (125% size, square root scale, cropped)
3 x 60s exposure (average combine), 3x3 binning, C Filter
2021-10-15 00:35 UT (#925084-86)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

M31 with AT 2021aaxp - 2021-10-22 (T+13.3d)
Image below (2021-10-22.958) was taken 13.3 days after discovery of 2021aaxp
Position of reported transient (no longer visible) is shown by white cross-hairs

Annotated CCD Image (125% size, square root scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2021-10-22 23:03 UT (#926076-80)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

M31 with AT2021aaxp - 2021-12-13 (T+65.2d)
Image below (2021-12-13.797) was taken 65.2 days after discovery of 2021aaxp
Position of earlier transient (no longer visible) is shown by white circle

Annotated CCD Image (125% size, square root scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, C Filter
2021-12-13 19:10 UT (#941055-59)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021aceg - Extragalactic Nova (discovered 2021-10-25) in M31

Nova 2021aceg in M31 (Andromeda)
AT2021aceg (Type: EGN) discovered 2021-10-25.570 UT by XOSS
Alias: PSP21ac, PNV J00473256+3938102
(Rochester Supernova site | Rochester EGN Page | Klaus Wenzel image )

M31 with AT 2021aceg
Image taken with secondary scope showing position of reported transient (blue circle)

CMOS Image (16% size)
10s exposure (stacked), 1x1 binning
2021-10-30 02:30 UT (#Cam2_Ref)
TS 80mm APO, ZWO ASI178MC & PHD2

Nova M31 AT 2021aceg (T+4.5d)
FOV of CCD image below is shown as a yellow rectangle in CMOS image above
Position of EGN is indicated by white cross-hairs

Annotated CCD Image (50% size, square root scale)
2 x 180s exposure (average combine), 3x3 binning, C Filter
2021-10-30 01:37 UT (#929109-10)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Nova M31 AT 2021aceg - 2021-10-30 (T+4.5d)
Image below (2021-10-30.065) was taken 4.5 days after discovery of 2021aceg
Position of EGN (faint but distinct) is shown by white cross-hairs
Measured magnitude +16.87 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped)
2 x 180s exposure (average combine), 3x3 binning, C Filter
2021-10-30 01:37 UT (#929109-10)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Nova 2021aceg in M31 - 2021-10-31 (T+5.5d)
Image below (2021-10-31.102) was taken 5.5 days after discovery of 2021aceg
Position of EGN is shown by white cross-hairs
Measured magnitude +17.15 (Clear Filter)
Object confirmed not to be a known foreground star using Aladin

Annotated CCD Image (150% size, square root scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2021-10-31 02:36 UT (#930169-73)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Nova 2021aceg in M31 - 2021-11-03 (T+9.4d)
Image below (2021-11-03.998) was taken 9.4 days after discovery of 2021aceg
EGN is shown by white cross-hairs
Measured magnitude +17.8
Object confirmed not to be a known foreground star using Aladin

Annotated CCD Image (150% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-11-04 00:06 UT (#931088-92)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Nova 2021aceg in M31 - 2021-11-23 (T+29.2d)
Image below (2021-11-23.751) was taken 29.2 days after discovery of 2021aceg
EGN (faint) is shown by white cross-hairs

Annotated CCD Image (150% size, square root scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2021-11-23 18:09 UT (#936013-17)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Nova 2021aceg in M31 - 2021-11-24 (T+30.2d)
Image below (2021-11-24.765) was taken 30.2 days after discovery of 2021aceg
EGN position is shown by white cross-hairs
The image is unfortunately ruined by a residual light trail left in the CCD Substrate
from a plane that crossed the field of view during the previous frame

Annotated CCD Image (150% size, square root scale, cropped)
180s exposure (single frame), 3x3 binning, C Filter
2021-11-24 18:30 UT (#937021)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Nova 2021aceg in M31 - 2021-12-05 (T+41.3d)
Image below (2021-12-05.820) was taken 41.3 days after discovery of 2021aceg
Position of earlier EGN (no longer visible) is shown by white cross-hairs

Annotated CCD Image (150% size, square root scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2021-12-05 19:49 UT (#939058-61)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021yul - Nova (discovered 2021-09-13) in M110

M110 with AT 2021yul (Andromeda)
AT 2021yul (Type: Nova) discovered 2021-09-13.740 UT by XOSS
Alias: PSP21J, ZTF21acbutpl
Discovery Magnitude +17.7 (Clear Filter)
vs Prior Non-Detection Limiting Magnitude 18.0
(Rochester Supernova site | Rochester EGN Page | TNS 2021yul )

Nova's reported position is shown by white circle

Annotated CCD Image (50% size, square root scale)
3 x 180s exposure (average combine), 3x3 binning, C Filter
2021-09-28 02:43 UT (#917265-69)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

M110 with AT 2021yul - 2021-09-28 (T+14.4d)
Image below (2021-09-28.106) was taken 14.4 days after discovery of 2021yul
Nova (faint) is shown by white cross-hairs

Annotated CCD Image (100% size, square root scale, cropped
Image details above

M110 with AT 2021yul - 2021-10-25 (T+41.4d)
Image below (2021-10-25.116) was taken 41.4 days after discovery of 2021yul
Position of earlier nova (faded & no longer visible) is shown by white cross-hairs
Non-Detection Limiting Magnitude +19.2 (Clear Filter)

Annotated CCD Image (100% size, square root scale, cropped
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-10-25 02:55 UT (#927122-26)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

M110 with AT2021yul - 2021-11-24 (T+72.2d)
Image below (2021-11-24.896) was taken 72.2 days after discovery of 2021yul
Position of earlier Nova (no longer visible) is shown by white cross-hairs

Annotated CCD Image (100% size, square root scale, cropped
3 x 180s exposure (average combine), 3x3 binning, C Filter
2021-11-24 21:36 UT (#937160-62)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

M33 Transients (2021)

AT 2021wcf - Transient (discovered 2021-07-20) in M33

M33 with AT2021wcf (Triangulum)
AT2021wcf (Type: unk) discovered 2021-07-20.704 UT by Koichi Itagaki
Alias: Gaia21duh, Nova M33 2021-07a?, TCP J01333854+3035364
Discovery Magnitude 18.5 (g-Gaia Filter)
(Rochester Supernova site | Rochester EGN Page | Nick James image |

AT2021wcf is a blue transient / possibly a nova
[ TNS 2021wcf | Gaia21duh ]

M33 with AT2021wcf (T+42.3d)
Region with the reported transient is shown by the white rectangle

Annotated CCD Image (70% size, square root scale)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2021-09-01 00:10 UT (#910065-68)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

M33 with AT2021wcf - 2021-09-01 (T+42.3d)
Image below (2021-09-01.001) was taken 42.3 days after discovery of 2021wcf
FOV is showed by the white rectangle in wider view image above
The reported transient (faint) is shown by white cross-hairs

Annotated CCD Image (200% size, square root scale, cropped
4 x 180s exposure (average combine), 3x3 binning, C Filter
2021-09-01 00:10 UT (#910065-68)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Negative CCD Image (200% size, square root scale, cropped
Image details as above

M33 with AT 2021wcf - 2021-09-08 (T+49.3d)
Image below (2021-09-08.020) was taken 49.3 days after discovery of 2021wcff
The reported transient (very faint) is shown by white cross-hairs

Annotated CCD Image (200% size, square root scale, cropped
4 x 180s exposure (average combine), 3x3 binning, C Filter
2021-09-08 00:36 UT (#912117-20)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

M33 with AT 2021wcf - 2021-09-30 (T+71.3d)
Image below (2021-09-30.003) was taken 71.3 days after discovery of 2021wcf
Position of earlier transient (no longer visible) is shown by white cross-hairs

Annotated CCD Image (200% size, square root scale, cropped
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-09-30 00:14 UT (#918167-71)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Other Extragalactic Transients (2024)

AT 2021rl - BL Type Transient (QSO 0954+658)

AT2 021rl (Ursa Major)
BL Type Transient, QSO 0954+658, 6C 095456+654857
AT 2021rl (Type: BL) discovered 2021/01/06.449 UT by Gaia
Alias: Gaia21acz

Triggering Magnitude 14.21 (vs Historic Magnitude 15.57)
( Gaia21acz )

AT 2021rl - 2021-01-24 (T+17.6d)
BL Type object shown by white cross hairs.

Annotated CCD Image (50% size, linear scale)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-01-24 00:28 UT (#854245-49)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT2021rl - 2021-01-24 (T+17.6d)
Image below (2021-01-24.013) was taken 17.6 days after discovery of 2021rl
BL Type object shown by white cross hairs.
Measured magnitude +14.1 (vs catalog mag of +15.5)

Annotated CCD Image (100% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-01-24 00:28 UT (#854245-49)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021rl - 2021-02-02 (T+26.6d)
Image below (2021-02-02.002) was taken 26.6 days after discovery of 2021rl
BL Type object shown by white cross hairs.
Measured magnitude +14.3 (vs catalog mag of +15.5)

Annotated CCD Image (100% size, linear scale, cropped)
180s exposure (single frame), 3x3 binning, C Filter
2021-02-02 00:06 UT (#857195)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021rl - 2021-02-17 (T+41.6d)
Image below (2021-02-17.065) was taken 41.6 days after discovery of 2021rl
BL Type object shown by white cross hairs.
Measured magnitude +14.2 (vs catalog mag of +15.5)

Annotated CCD Image (100% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-02-17 01:43 UT (#859200-04)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021rl - 2021-02-22 (T+47.5d)
Image below (2021-02-22.914) was taken 47.5 days after discovery of 2021rl
BL Type object shown by white cross hairs.
Measured magnitude +13.5 (vs catalog mag of +15.5)

Annotated CCD Image (100% size, linear scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, C Filter
2021-02-22 22:02 UT (#861089-91)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021rl - 2021-12-17 (T+344.7d)
Image below (2021-12-17.124) was taken 344.7 days after discovery of 2021rl
BL Type object shown by white cross hairs.
Measured magnitude +15.1 (vs catalog mag of +15.5)

Annotated CCD Image (100% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-12-17 03:08 UT (#942276-80)
12" LX200R (at f/10.4) + ST-10XME
Non-guided

AT 2021rl - 2022-01-17 (T+376.5d)
Image below (2022-01-17.923) was taken 376.5 days after discovery of 2021rl
BL Type object shown by white cross hairs.
Measured magnitude +15.02

Annotated CCD Image (100% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-17 22:19 UT (#955094-98)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021rl - 2022-01-22 (T+380.7d)
Image below (2022-01-22.145) was taken 380.7 days after discovery of 2021rl
BL Type object shown by white cross hairs.
Measured magnitude +15.05 (vs catalog mag of +15.5)

Annotated CCD Image (100% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-22 03:38 UT (#957332-36)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021rl - 2022-01-22 (T+381.5d)
Image below (2022-01-22.919) was taken 381.5 days after discovery of 2021rl
BL Type object shown by white cross hairs.
Measured magnitude +14.89 (vs catalog mag of +15.5)

Annotated CCD Image (100% size, linear scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-22 22:11 UT (#958099-102)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021bgi - AGN / Transient (discovered 2021-01-27) in 2MASX J12303540+4257559

AT2021bgi (Canes Venatici)
In 2MASX J12303540+4257559
AT2021bgi (Type AGN, zhost=0.065590) discovered 2021-01-27.048 UT by GSNST
Alias: GSNST-21ar
( Rochester Supernova site )

2MASX J12303540+4257559 with AT2021bgi
Galaxy with transient is shown by white cross hairs.
Other galaxies in same field of view :
PGC 41314 (catalog mag +16.5),
PGC 2208351 (catalog mag +17.2)

Annotated CCD Image (50% size, square root scale)
2 x 180s exposure (average combine), 3x3 binning, C Filter
2021-02-02 02:05 UT (#857263-66)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

2MASX J12303540+4257559 with AT2021bgi - 2021-02-02 (T+6.0d)
Image below (2021-02-02.079) was taken 6.0 days after discovery of 2021bgi
Transient/Galaxy nucleus is shown by white cross hairs. Combined magnitude +15.8

Annotated CCD Image (125% size, square root scale, cropped)
2 x 180s exposure (average combine), 3x3 binning, C Filter
2021-02-02 02:05 UT (#857263-66)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

2MASX J12303540+4257559 with AT2021bgi - 2021-02-28 (T+32.0d)
Image below (2021-02-28.037) was taken 32.0 days after discovery of 2021bgi
Transient/Galaxy nucleus is shown by white cross hairs. Combined magnitude +15.5 (brightening)

Annotated CCD Image (125% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-02-28 01:02 UT (#865133-37)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

2MASX J12303540+4257559 with AT 2021bgi - 2021-03-29 (T+61.9d)
Image below (2021-03-29.990) was taken 61.9 days after discovery of 2021bgi
Transient/Galaxy nucleus is shown by white cross hairs.
Combined magnitude +15.61 (fading ?)

Annotated CCD Image (125% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-29 23:56 UT (#877081-85)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

2MASX J12303540+4257559 / AT2021bgi - 2022-03-06 (T+403.0d)
Image below (2022-03-06.094) was taken 403.0 days after discovery of 2021bgi
Position of earlier transient/Galaxy nucleus is shown by white cross hairs.
Combined magnitude +15.57 (? steady)

Annotated CCD Image (125% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-03-06 02:24 UT (#982173-77)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021biy - Type LRN Transient (discovered 2021-01-29) in NGC 4631

NGC 4631 with AT 2021biy (Canes Venatici)
AT 2021biy (Type: LRN) discovered 2021/01/29.559 UT by ATLAS
Alias: ATLAS21dfy (Discovery Note)
(Rochester Supernova site | Odd Trondal image | Nick James image | TNS 2021biy)

LRN = Luminous Red Nova [ LRN Transients ]

NGC 4631 with AT 2021biy
Other galaxy in same field of view is NGC 4627 (catalog mag +12.0)

Annotated CCD Image (70% size, square root scale, cropped)
2 x 180s exposure (average combine), 3x3 binning, C Filter
2021-02-02 04:39 UT (#857292-94)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Negative CCD Image (70% size, square root scale, cropped)
Image details as above

NGC 4631 with AT 2021biy - Image sequence T-2110d to T+52.6d
(SN discovery, T = 2021-01-29.559)

NGC 4631 before AT 2021biy - 2015-04-21
Image below (2015-04-21) was taken 2110 days before discovery of LRN 2021biy
Position of the later LRN is shown by a white circle.

Annotated CCD Image (95% size, square root scale, cropped)
3 x 90s exposure (average combine), 3x3 binning, C Filter
2015-04-21 00:29 h UT (#585105-07)
12" LX200R (at f/10.4) + ST-10XME

NGC 4631 with AT 2021biy - 2021-02-02 (T+3.6d)
Image below (2021-02-02.190) was taken 3.6 days after discovery of 2021biy
LRN shown by white cross hairs. Measured magnitude +16.6

Annotated CCD Image (100% size, square root scale, cropped)
2 x 180s exposure (average combine), 3x3 binning, C Filter
2021-02-02 04:39 UT (#857292-94)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 4631 with AT 2021biy - 2021-02-11 (T+12.7d)
Image below (2021-02-11.229) was taken 12.7 days after discovery of 2021biy
LRN shown by white cross hairs. Measured magnitude +16.6

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-02-11 05:39 UT (#858257-61)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 4631 with AT 2021biy - 2021-02-19 (T+20.5d)
Image below (2021-02-19.081) was taken 20.5 days after discovery of 2021biy
LRN shown by white cross hairs. Measured magnitude +16.6

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-02-19 02:05 UT (#860077-81)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 4631 with AT 2021biy - 2021-02-25 (T+26.6d)
Image below (2021-02-25.109) was taken 26.6 days after discovery of 2021biy
LRN shown by white cross hairs. Measured magnitude ?

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-02-25 02:46 UT (#862027-31)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 4631 with AT 2021biy - 2021-02-28 (T+29.5d)
Image below (2021-02-28.068) was taken 29.5 days after discovery of 2021biy
LRN shown by white cross hairs. Measured magnitude +16.5
(Image affected by offset light source)

Annotated CCD Image (100% size, square root scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2021-02-28 01:46 UT (#865160-63)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 4631 with AT 2021biy - 2021-03-13 (T+43.4d)
Image below (2021-03-13.964) was taken 43.4 days after discovery of 2021biy
LRN (very faint) is shown by white cross hairs.

Annotated CCD Image (100% size, square root scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-13 23:14 UT (#869078-80)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 4631 with AT 2021biy - 2021-03-14 (T+44.4d)
Image below (2021-03-14.924) was taken 44.4 days after discovery of 2021biy
LRN (very faint) is shown by white cross hairs.
Very poor quality image (due to poor guiding)

Annotated CCD Image (100% size, square root scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-14 22:21 UT (#870022-26)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 4631 with AT 2021biy - 2021-03-22 (T+51.5d)
Image below (2021-03-22.036) was taken 51.5 days after discovery of 2021biy
LRN (very faint) is shown by white cross hairs.

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-22 01:01 UT (#873041-45)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 4631 with AT 2021biy - 2021-03-23 (T+52.6d)
Image below (2021-03-23.147) was taken 52.6 days after discovery of 2021biy
LRN shown by white cross hairs. Measured magnitude ? (fading)

Annotated CCD Image (100% size, square root scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-23 03:39 UT (#874207-10)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 4631 with AT 2021biy - 2021-03-16 (T+46.4d)
Image below (2021-03-16.928) was taken 46.4 days after discovery of 2021biy
LRN (very faint) is shown by white cross hairs.

Annotated CCD Image (100% size, square root scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-16 22:24 UT (#871052-55)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 4631 with AT 2021biy - 2021-03-30 (T+59.6d)
Image below (2021-03-30.119) was taken 59.6 days after discovery of 2021biy
Position of earlier LRN (not distinguishable/not visible) is shown by white cross hairs.

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-30 03:00 UT (#877140-44)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021blu - LBV Transient (discovered 2021-02-01) in UGC 5829

UGC 5829 with LBV 2021blu (Leo Minor)
AT 2021blu (Type: LBV) discovered 2021/02/01.467 UT by ATLAS
Alias: ATLAS21dic, ZTF21aagppzg
[ Irregular Galaxies ]

LBV is indicated by white cross-hairs

Annotated CCD Image (50% size, square root scale)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-02-11 03:03 UT (#858205-09)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 5829 with LBV 2021blu - 2021-02-11 (T+9.7d)
Image below (2021-02-11.120) was taken 9.7 days after discovery of 2021blu
LBV is indicated by white cross-hairs. Measured magnitude +16.4

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-02-11 03:03 UT (#858205-09)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Negative CCD Image (100% size, square root scale, cropped)
Image details as above

UGC 5829 with LBV 2021blu - 2021-03-13 (T+40.5d)
Image below (2021-03-13.949) was taken 40.5 days after discovery of 2021blu
LBV is indicated by white cross-hairs. Measured magnitude +17.71

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-13 22:56 UT (#869071-75)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 5829 with LBV2021blu - 2021-03-16 (T+43.5d)
Image below (2021-03-16.998) was taken 43.5 days after discovery of 2021blu
LBV is indicated by white cross-hairs. Measured magnitude +17.68

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-17 00:06 UT (#871102-06)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 5829 with LBV2021blu - 2021-03-29 (T+56.5d)
Image below (2021-03-29.933) was taken 56.5 days after discovery of 2021blu
Position of LBV (faint) is indicated by white cross-hairs.
Measured magnitude +17.83 (fading)

Annotated CCD Image (100% size, square root scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-29 22:32 UT (#877055-57)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 5829 - 2022-01-01 (T+334.5d)
Image below (2022-01-01.938) was taken 334.5 days after discovery of 2021blu
Position of earlier LBV (no longer visible) is indicated by white cross-hairs.

Annotated CCD Image (100% size, square root scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-01 22:41 UT (#947132-36)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 5829 with LBV 2021blu - 2022-01-06 (T+338.7d)
Image below (2022-01-06.153) was taken 338.7 days after discovery of 2021blu
Position of earlier LBV (no longer visible) is indicated by white cross-hairs.

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-06 03:51 UT (#949090-94)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021cek - Unconfirmed Transient (discovered 2021-02-06) in NGC 4041 (Unconfirmed)

NGC 4041 with AT 2021cek (Ursa Major)
AT 2021cek (Type: unconf) discovered 2021/02/06.501 UT by Akihiro Nakayama
Discovery magnitude 16.5
( Rochester Supernova site | TNS 2021cek )

NGC 4041 - Spiral Galaxy
NGC 4041 / alias: Herschel I-252 (catalog mag +11.1)
Other galaxy in same field of view is PGC 38090 (catalog mag +15.9)

Annotated CCD Image (50% size, log scale)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-02-11 01:26 UT (#858171-75)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 4041 with AT 2021cek - 2021-02-11 (T+4.6d)
Image below (2021-02-11.053) was taken 4.6 days after reported discovery of 2021cek
No firm indication of transient in the image below. It is either faint or lies too
close to the nucleus to distinguish as a distinct object.
Transient is unconfirmed.

CCD Image (100% size, log scale, cropped)
Image details as above

Negative CCD Image (100% size, log scale, cropped)
Image details as above

NGC 4041 with AT 2021cek - 2021-03-14 (T+35.5d)
Image below (2021-03-14.046) was taken 35.5 days after discovery of 2021cek
Position of reported transient (not visible) is shown by white cross-hairs
Transient is unconfirmed.

CCD Image (100% size, log scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-14 01:14 UT (#869124-27)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021djx - Type QSO Transient (discovered 2021-02-19)

AT 2021djx (Sextans)
AT 2021djx (Type: QSO) discovered 2021/02/19.145 UT by MASTER
Alias: MASTER OT J094759.84+061043.6
QSO Outburst

Discovery Magnitude 16.2 (C)
(vs earlier non-detection (limiting) magnitude 19.8)
( Rochester Supernova site | TNS 2021djx )

Seems to correspond to two Simbad objects :
GALEX J094759.8+061043 -- UV-emission source
GALEX J094759.8+061044 -- UV-emission source

AT 2021djx - 2022-01-14 (T+328.9d)
Image below (2022-01-14.076) was taken 328.9 days after discovery of 2021djx
Position of earlier QSO transient (no longer visible) is shown by white circle

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-14 01:58 UT (#954072-76)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021fbu - Type AGN Transient (discovered 2021-03-06) in VV 807

VV 807 with AT 2021fbu (Hercules)
AT 2021fbu (Type: AGN) discovered 2021/03/06.861 UT by Gaia
Alias: Gaia21bgd
Discovery Magnitude +16.36 (G-Gaia Filter)
(Rochester Supernova site | TNS 2021fbu | Gaia21bgd )

VV 807 - Galaxy
[ Vorontsov-Velyaminov Galaxies ]

Annotated CCD Image (150% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-04-15 01:35 UT (#885114-18)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

VV 807 with AT 2021fbu - 2021-04-15 (T+39.2d)
Image below (2021-04-15.060) was taken 39.2 days after discovery of 2021fbu
Position of transient (not separately distinguishable) is shown by white cross hairs.
Measured magnitude +14.99 (nucleus + transient, Clear Filter)

VV 807 with AT 2021fbu - 2021-06-01 (T+86.2d)
Image below (2021-06-01.021) was taken 86.2 days after discovery of 2021fbu
Position of transient (not separately distinguishable) is shown by white cross hairs.
Measured magnitude +15.14 (nucleus + transient, Clear Filter)
Poor quality image (bright sky background)

Annotated CCD Image (150% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-06-01 00:38 UT (#899056-60)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

VV 807 - 2022-02-09
Measured magnitude +xxx (nucleus + transient, Clear Filter)

CCD Image (150% size,square root scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2022-02-09 04:56 UT (#967196-200)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021fmd - Possible Transient (discovered 2021-03-12) in NGC 3515 (Unconfirmed)

NGC 3515 with AT 2021fmd (Leo Minor)
AT 2021fmd (Type: unk) discovered 2021/03/12.290 UT by ASAS-SN
Alias: ASASSN-21de
Discovery Magnitude 17.3 (ABMag vs Limiting flux: 17.5)
( Rochester Supernova site | TNS 2021fmd )

NGC 3515 - Spiral Galaxy
NGC 3515 / PGC 33467 (catalog mag +13.9 or +14.8)
with other galaxies in same FOV:
PGC 1832094 (catalog mag +17.3), PGC 1830775 (catalog mag +17.7),
PGC 1831688 (catalog mag +17.9), PGC 1831328 (catalog mag +18.2)

Annotated CCD Image (50% size, square root scale)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-23 00:53 UT (#874146-50)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 3515 with AT 2021fmd
Image Sequence T+9.8d to T+10.7d
Transient Discovery : 2021/03/12.290 (T0)

NGC 3515 with AT 2021fmd - 2021-03-22 (T+9.8d)
Image below (2021-03-22.051) was taken 9.8 days after discovery of 2021fmd
No definate confirmation of transient object it may be faint or very close to galaxy nucleus
Measured magnitude + 15.39 (nucleus+transient)

Annotated CCD Image (125% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-22 01:23 UT (#873048-52)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 3515 with AT 2021fmd - 2021-03-23 (T+10.7d)
Image below (2021-03-23.031) was taken 10.7 days after reported discovery of 2021fmd
No definate confirmation of transient object it may be faint or very close to galaxy nucleus
Measured magnitude + 15.5 (nucleus+transient)

Annotated CCD Image (125% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-23 00:53 UT (#874146-50)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 3515 with AT 2021fmd - 2021-03-30 (T+17.7d)
Image below (2021-03-30.017) was taken 17.7 days after discovery of 2021fmd
No definate confirmation of transient object it may be faint or very close to galaxy nucleus
Measured magnitude + 15.36 (nucleus+transient)

Annotated CCD Image (125% size, square root scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-30 00:35 UT (#877096-99)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021fyd - Transient (discovered 2022-03-17) in IC 357 (unconfirmed)

IC 357 with AT 2021fyd (Taurus)
AT 2021fyd (Type: unk) discovered 2021/03/17.187 UT by ZTF
Alias: ZTF21aapdpup
Discovery Magnitude 18.01
(Rochester Supernova site | TNS 2021fyd )

IC 357 - Spiral Galaxy
Alias PGC 14384 (catalog mag +15.0)

Other galaxies is same field of view are:
PGC 14400 (catalog mag +16.2), PGC 14398 (catalog mag +16.8),
PGC 213269 (catalog mag +18.3)

Annotated CCD Image (50% size, square root scale)
2 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-24 20:58 UT (#875014-15)
12" LX200R (at f/10.4) + ST-10XME
(Auto-guiding failed)

IC 357 - Spiral Galaxy, Detail

Annotated CCD Image (125% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-09-20 03:16 UT (#914181-85)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

IC 357 with AT 2021fyd - 22 (T+5.7d)
Image below (2021-03-22.905) was taken 5.7 days after discovery of 2021fyd
Unable to identify transient. It might lay at or very close to
the galaxy' center. Transient is unconfirmed.
Measured Magnitude (nucleus) +14.9

CCD Image (125% size, square root scale, cropped)
2 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-22 21:48 UT (#874041-42)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

IC 357 with AT 2021fyd - 2021-03-24 (T+7.7d)
Image below (2021-03-24.864) was taken 7.7 days after reported discovery of 2021fy
Unable to identify transient. It might lay at or very close to
the galaxy' center. Transient is unconfirmed.

CCD Image (125% size, square root scale, cropped)
2 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-24 20:58 UT (#875014-15)
12" LX200R (at f/10.4) + ST-10XME
(Auto-guiding failed)

IC 357 with AT 2021fyd - 2021-03-29 (T+12.7d)
Image below (2021-03-29.872) was taken 12.7 days after discovery of 2021fyd
Unable to identify transient. It might lay at or very close to
the galaxy' center. Transient is unconfirmed.
Measured Magnitude (nucleus) +14.77

Annotated CCD Image (125% size, square root scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, C Filter
2021-03-29 21:04 UT (#877021-23)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

IC 357 with AT 2021fyd - 2021-09-20 (T+186.9d)
Image below (2021-09-20.131) was taken 186.9 days after discovery of 2021fyd
Position of reported transient (not separately distinguishable) is shown by white cross-hairs
Measured Magnitude (nucleus +SN) +14.57 (Clear Filter)

IC 357 with AT 2021fyd - 2021-09-22 (T+188.9d)
Image below (2021-09-22.063) was taken 188.9 days after discovery of 2021fyd
Position of reported transient (not separately distinguishable) is shown by white cross-hairs
Measured Magnitude (nucleus +SN) +14.62 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-09-22 01:38 UT (#915232-36)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT2021hut - Type AGN Transient (discovered 2021-04-03) in PGC 48045

AT2021hut (Virgo)
In 2MASX J13364424-0329521 ( PGC 48045)
AT2021hut (Type: AGN) discovered 2021/04/03.020 UT by GSNST
Alias: GSNST-21bj
( Rochester Supernova site | TNS 2021hut )

2MASX J13364424-0329521 (PGC 48045) with AT2021hut (T+346.0d)
Position of host galaxy with earlier AGN transient AT2021hut is shown by white cross-hairs
PGC 48045 (catalog mag +15.2)

Annotated CCD Image (50% size, square root scale)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2022-03-15 01:28 UT (#985019-23)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021hut - 2021-04-21 (T+18.9d)
Image below (2021-04-21.958) was taken 18.9 days after discovery of 2021hut
Position of earlier transient (distinct ?) is shown by white cross-hairs
Measured Magnitude +15.46 (Clear Filter, galaxy + nucleus)

Annotated CCD Image (50% size, square root scale)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2021-04-21 23:07 UT (#889013-16)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

2MASX J13364424-0329521 with AT2021hut - 2022-03-15 (T+346.0d)
Image below (2022-03-15.054) was taken 346.0 days after discovery of 2021hut
Position of earlier transient (presumably faded) is shown by white cross-hairs
Measured Magnitude +15.63 (Nucleus + AGN, Clear Filter)

AT 2021ilb - Transient (discovered 2021-04-05) in M61

M61 with AT2021ilb (Virgo)
AT2021ilb (Type: unconf) discovered 2021-04-05.815 UT by Lorenzo Siciliano
Discovery Magnitude 16.0 (Clear Filter)
( TNS 2021ilb )

M61 - Spiral Galaxy

Annotated CCD Image (50% size, square root scale)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-04-12 23:23 UT (#883067-71)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

M61 with AT2021ilb (Attempt) - 2021-04-12 (T+7.2d)
Image below (2021-04-12.967) was taken 7.2 days after discovery of 2021ilb
Position of reported transient (not visible) is indicated by white cross-hairs

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-04-12 23:23 UT (#883067-71)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021irz - Transient (discovered 2021-04-07) in UGC 1977

UGC 1977 with AT 2021irz (Andromeda)
AT 2021irz (Type: unk) discovered 2021/04/07.539 UT by Gaia
Alias: Gaia21bsj
Discovery Magnitude 17.89 (G-Gaia Filter)
Candidate SN in galaxy UGC 1977 (never classified/confirmed)
The gsaweb web page for Gaia21bsj shows that transient
reached mag +17.8 on 2021-04-07 before fading to +20.9 by 2021-07-05
( TNS 2021irz | Gaia21bsj )

UGC 1977 with AT 2021irz - 2021-09-22 (T+167.6d)
Image below (2021-09-22.113) was taken 167.6 days after discovery of 2021irz
Position of earlier tranisent (not visible) is shown by white cross-hairs.
Non-Detection Limiting Magnitude +19.0 (Clear Filter)

Annotated CCD Image (175% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-09-22 02:51 UT (#915274-78)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2021irz (in UGC 1977) on Transients 2021 Page >>

AT 2021lwx - Type AGN Transient (discovered 2021-04-13) in Unnamed Galaxy (Attempt)

AT 2021lwx (Vulpecula)
2021lwx (Type: AGN) discovered 2021-04-13 10:55.51 UT by ZTF
Discovery Magnitude 18.05 (r-ZTF Filter)

Event was reported on BBC Website on 2023-05-12
"Astronomers detect largest cosmic explosion ever seen"
https://www.bbc.co.uk/news/science-environment-65571309
The explosion is more than 10 times brighter than any recorded
exploding star - known as a supernova. So far it has lasted more than three years, much longer than
most supernovae which are usually only visibly bright for a few months. One theory is that
the blast was caused when a vast cloud of gas was swallowed up by a black hole.
( TNS 2021lwx )

AT 2021lwx - 2023-05-12 (T+759.5d), Locate Frame
Position of reported transient (not visible) is shown by cyan circle

Annotated CCD Image (50% size, linear)
10s exposure (single frame), 3x3 binning, Clear Filter
2023-05-12 23:08 UT (#1119025)
12" LX200R (at f/10.4) + ST-10XME

AT 2021lwx - 2023-05-12 (T+759.5d)
Image below (2023-05-12.967) was taken 759.5 days after discovery of 2021lwx
Position of reported transient (not visible) is shown by white circle
Poor quality image (poor guiding / single frame only)

Annotated CCD Image (100% size, square root scale, cropped)
180s exposure (single frame), 3x3 binning, Clear Filter
2023-05-12 23:13 UT (#1119026)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021lwx - 2023-05-12 (T+759.5d)
Above image altered to remove guiding artefact

Annotated CCD Image (100% size, square root scale, cropped)
Image details as above

Images of AT 2021lwx on Transients 2021 Page >>

AT 2021knq - Transient (discovered 2021-04-26) in UGC 8426

UGC 8426 with AT 2021knq (Canes Venatici)
AT 2021knq (Type: unk) discovered 2021/04/26.034 UT by MASTER
Alias: MASTER OT J132415.53+312019.0
Discovery Magnitude 17.2
( Rochester Supernova site | TNS 2021knq )

UGC 8426 - Spiral Galaxy

Annotated CCD Image (50% size, square root scale)
3 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-02 04:29 UT (#947253-56)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 8426 with AT 2021knq - 2021-04-30 (T+4.9d)
Image below (2021-04-30.949) was taken 4.9 days after discovery of 2021knq
Reported position of transient (faint) is shown by white cross-hairs
Estimated Magnitude +17.8

Annotated CCD Image (125% size, square root scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2021-04-30 22:53 UT (#893022-25)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 8426 with AT 2021knq - 2021-05-05 (T+10.0d)
Image below (2021-05-05.984) was taken 10.0 days after discovery of 2021knq
Reported position of transient (faint) is shown by white cross-hairs
Estimated Magnitude +17.8 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-05-05 23:46 UT (#894041-45)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 8426 with AT 2021knq - 2021-05-07 (T+11.0d)
Image below (2021-05-07.013) was taken 11.0 days after discovery of 2021knq
Reported position of transient (faint) is shown by white cross-hairs
Estimated Magnitude +17.9 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-05-07 00:28 UT (#895026-30)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 8426 with AT 2021knq - 2021-05-08 (T+12.0d)
Image below (2021-05-08.011) was taken 12.0 days after discovery of 2021knq
Reported position of transient (faint) is shown by white cross-hairs

Annotated CCD Image (125% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-05-08 00:25 UT (#896011-15)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 8426 with AT 2021knq - 2021-05-22 (T+27.0d)
Image below (2021-05-22.989) was taken 27.0 days after discovery of 2021knq
Reported position of transient (faint) is shown by white cross-hairs
Poor quality image (poor sky transparency, cloud, single frame)

Annotated CCD Image (125% size, square root scale, cropped)
180s exposure (single frame), 3x3 binning, C Filter
2021-05-22 23:44 UT (#898022)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 8426 with AT 2021knq - 2022-01-02 (T+251.1d)
Image below (2022-01-02.181) was taken 251.1 days after discovery of 2021knq
Reported position of transient (very faint ?) is shown by white cross-hairs

Annotated CCD Image (125% size, square root scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-02 04:29 UT (#947253-56)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 8426 with AT 2021knq - 2022-01-09 (T+258.2d)
Image below (2022-01-09.210) was taken 258.2 days after discovery of 2021knq
Reported position of transient (very faint ?) is shown by white cross-hairs

Annotated CCD Image (125% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-09 05:11 UT (#951103-07)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021ugn - Transient (discovered 2021-07-28) in UGC 11252 (attempted observation)

UGC 11252 with AT 2021ugn (Draco)
AT 2021ugn (Type: unk) discovered 2021-07-28.308 UT by ZTF
Alias: ZTF19abvxgtn, Gaia21edh

( Rochester Supernova site | TNS 2021ugn | Gaia21edh )

UGC 11252 - Spiral Galaxy

Annotated CCD Image (50% size, square root scale)
2 x 180s exposure (average combine), 3x3 binning, C Filter
2022-03-18 01:48 UT (#987182-86)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 11252 with AT 2021ugn - 2022-03-18 (T+232.8d)
Image below (2022-03-18.069) was taken 232.8 days after discovery of 2021ugn
Position of reported transient (not visible) is shown by white cross-hairs

Annotated CCD Image (125% size,square root scale, cropped)
2 x 180s exposure (average combine), 3x3 binning, C Filter
2022-03-18 01:48 UT (#987182-86)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021vqu - Type QSO Transient (discovered 2021-08-09)

AT 2021vqu (Pisces)
AT 2021vqu (Type: QSO) discovered 2021-08-09.570 UT by Gaia
Alias: Gaia21dsc
Discovery Magnitude 16.68 (G-Gaia Filter)
vs Historic Magnitude 16.94 +/- 0.06 SD
~0.25 mag rise in known QSO
( TNS 2021vqu | Gaia21dsc )

AT 2021vqu - 2021-09-25 (T+46.6d)
Image below (2021-09-25.126) was taken 46.6 days after discovery of 2021vqu
Position of reported transient (faint but distinct) is indicated by white cross-hairs
Measured Magnitude +16.55 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2021-09-25 03:09 UT (#916039-42)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Annotated negative CCD Image (100% size, square root scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2021-09-25 03:09 UT (#916039-42)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021wkx - M Dwarf Type Transient in WISEA Galaxy (PGC 2670810)

AT 2021wkx (Draco)
Alias: In WISEA J165817.77+644220.4
AT 2021wkx (Type: M Dwarf) discovered 2021-08-20.027 UT by MASTER
Alias: MASTER OT J165819.02+644213.9
Discovery Magnitude 16.6 (Clear Filter)
(Rochester Supernova site | TNS 2021wkx )

WISEA J165817.77+644220.4 - Galaxy
Alias : PGC 2670810

Annotated CCD Image (150% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-09-21 20:45 UT (#915045-49)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021wkx - 2021-09-21 (T+32.8d)
Image below (2021-09-21.858) was taken 32.8 days after discovery of 2021wkx
Position of reported transient (not visible) is shown by white cross-hairs

AT 2021abbn - Transient (discovered 2021-10-07) in UGC 3383

UGC 3383 with AT 2021abbn (Auriga)
AT 2021abbn (Type: unk) discovered 2021-10-07.564 UT by ATLAS
Alias: ATLAS21bkav
(Rochester Supernova site, TNS 2021abbn )

UGC 3383 - Spiral Galaxy
Bright star in on left handside of FOV is SAO 25509 (mag +7.9)
Glare at bottom of image is from HIP 28358 (mag +3.7) lying 2.5' outside of FOV

Annotated CCD Image (50% size, square root scale)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-02-04 20:31 UT (#963056-60)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 3383 with AT 2021abbn - 2022-01-05 (T+90.3d)
Image below (2022-01-05.897) was taken 90.3 days after discovery of 2021abbn
Position of reported transient (not visible / probably faded) is shown by white cross-hairs.

Annotated CCD Image (125% size, square root scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-05 21:38 UT (#949072-74)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 3383 with AT 2021abbn - 2022-02-04 (T+120.3d)
Image below (2022-02-04.849) was taken 120.3 days after discovery of 2021abbn
Position of reported transient (not distinguishable/not visible) is shown by white cross-hairs.

Annotated CCD Image (125% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-02-12 20:50 UT (#970003-07)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021ably - Transient (discovered 2021-10-14) in UGC 5994

UGC 5994 with AT2021ably (Leo)
AT2021ably (Type: unk) discovered 2021-10-14.615 UT by ATLAS
Alias: ATLAS21bkdw, Gaia21eym,
Discovery Magnitude 17.87 (orange-ATLAS Filter)
vs Prior Non-Detection Limiting Magnitude 19.44
(Rochester Supernova site | TNS 2021ably | Gaia21eym )

UGC 5994 - Spiral Galaxy

Annotated CCD Image (50% size, square root scale)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2021-11-17 06:12 UT (#934270-73)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 5994 with AT 2021ably - 2021-10-23 (T+8.6d)
Image below (2021-10-23.168) was taken 8.6 days after discovery of 2021ably
Position of reported transient (not visible) is close to galaxy centre
Very poor quality image (bright sky background, low S/N)

Annotated CCD Image (125% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-10-23 04:11 UT (#926203-07)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 5994 with AT 2021ably - 2021-10-25 (T+10.6d)
Image below (2021-10-25.173) was taken 10.6 days after discovery of 2021ably
Position of reported transient (close to galaxy centre &
not separately distinguishable) is shown by white cross-hairs

Annotated CCD Image (125% size, square root scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, C Filter
2021-10-25 04:14 UT (#927149-51)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 5994 with AT2021ably - 2021-11-17 (T+33.6d)
Image below (2021-11-17.252) was taken 33.6 days after discovery of 2021ably
Position of reported transient is close to galaxy centre
(no indication of transient or significant brightening of galaxy)

Annotated CCD Image (125% size, square root scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2021-11-17 06:12 UT (#934270-73)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021acbu - Transient (discovered 2021-10-24) in LEDA 1352843 (faded)

LEDA 1352843 with AT 2021acbu (Pisces)
AT 2021acbu (Type: unk) discovered 2021-10-24.074 UT by MASTER
Alias: MASTER OT J004711.21+084427.4
Discovery Magnitude +16.6 VegaMag (prior non-detection >+20.1)
( TNS 2021acbu )

LEDA 1352843 - Galaxy
LEDA 1352843 (alias PGC 1352843, catalog mag +17.6)

Position of LEDA 1352843 / PGC 1352843 is shown by white circle

Annotated CCD Image (50% size, square root scale)
4 x 180s exposure (average combine), 3x3 binning, Clear Filter
2022-09-15 02:13 UT (#1037065-68)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

LEDA 1352843 with AT 2021acbu - 2022-09-15 (T+326.0d)
Image below (2022-09-15.087) was taken 326.0 days after discovery of 2021acbu
Position of AT 2021acbu (no longer visible) is shown by white cross-hairs

Annotated CCD Image (150% size, square root scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, Clear Filter
2022-09-15 02:13 UT (#1037065-68)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2021acbu (LEDA 1352843) on Transients 2021 Page >>

AT 2021aczn - Type HPM Transient (discovered 2021-11-01) in NGC 1569

NGC 1569 with AT 2021aczn (Camelopardalis)
AT 2021aczn (Type: HPM) discovered 2021-11-01.000 UT by Jordi Camarasa
Discovery magnitude 14 (vs last non-detection mag <19 on 2021-10-20)
( Rochester Supernova site | TNS 2021aczn )

NGC 1569 - Irregular Galaxy
[ Irregular Galaxies ]

CCD Image (50% size, log scale)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-01 19:57 UT (#947050-53)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 1569 - Pre-Transient Image (2013)
A progenitor object to AT2021aczn seems to be present in this 2013 image

CCD Image (125% size, log scale, cropped)
4 x 120 sec exposure (average combine), 3x3 binning, C Filter
2013-10-15 19:08hUT (#549026-31)
12" LX200R (at f/9.7) + ST-10XME

NGC 1569 with AT 2021aczn - 2021-11-09 (T+8.9d)
Image below (2021-11-09.898) was taken 8.9 days after discovery of 2021aczn

The object marked as a 'Supernova' in Odd Trondal image is shown in the
image below by white cross-hairs, but the feature doesn't seem
to have changed since image taken in 2013

Annotated CCD Image (125% size, log scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-11-09 21:42 UT (#932060-64)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 1569 with AT 2021aczn - 2022-01-01 (T+61.8d)
Image below (2022-01-01.826) was taken 61.8 days after discovery of 2021aczn
Position of reported transient (apparently visible) is shown by white cross-hairs

CCD Image (125% size, log scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-01 19:57 UT (#947050-53)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 1569 with AT 2021aczn - 2022-01-07 (T+67.9d)
Image below (2022-01-07.872) was taken 67.9 days after discovery of 2021aczn
Position of reported transient (apparently visible) is shown by white cross-hairs

CCD Image (125% size, log scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-07 21:05 UT (#950080-84)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 1569 with AT 2021aczn - 2022-01-09 (T+69.9d)
Image below (2022-01-09.877) was taken 69.9 days after discovery of 2021aczn
Position of reported transient (visible) is shown by white cross-hairs

CCD Image (125% size, log scale, cropped)
180s exposure (single frame), 3x3 binning, C Filter
2022-01-09 21:06 UT (#952118)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021adlx - Transient (discovered 2021-11-05) in NGC 4134 (Attempted Observation)

NGC 4134 with AT 2021adlx (Coma Berenices)
AT 2021adlx (Type: unk) discovered 2021-11-05.548 UT by ZTF
Alias: ZTF21aclzzex, Gaia21fdu
Discovery Mag +18.82
Fading to Mag +19.5 by 2022-01-24
(Rochester Supernova site | TNS 2021adlx | Gaia21fdu )

NGC 4134 with AT 2021adlx - 2022-03-24 (T+138.5d)
Image below (2022-03-24.051) was taken 138.5 days after discovery of 2021adlx
Position of earlier transient (no longer visible) is shown by white cross-hairs

Annotated CCD Image (125% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-03-24 00:38 UT (#993088-92)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 4134 with AT 2021adlx - 2022-04-22 (T+168.5d)
Image below (2022-04-22.999) was taken 168.5 days after discovery of 2021adlx
Position of earlier transient (no longer visible) is shown by white cross-hairs

Annotated CCD Image (125% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-04-23 00:07 UT (#1003053-57)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021afkg - AGN Transient (discovered 2021-11-23) in 2MASS J09361749+0918146

AT 2021afkg in 2MASS J09361749+0918146 (Leo)
Alias: In 2MASS J09361749+0918146
AT 2021afkg (Type: AGN) discovered 2021-11-23.760 UT by Gaia
Alias: Gaia21fhb
( Rochester Supernova site | Gaia21fhb )

2MASS J09361749+0918146 - Seyfert 1 Galaxy

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-02-06 23:15 UT (#965059-63)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021afkg - 2021-12-30 (T+36.3d)
Image below (2021-12-30.072) was taken 36.3 days after discovery of 2021afkg
Galaxy with AGN is shown by white cross-hairs
Poor quality image (poor sky transparency)

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2021-12-30 01:53 UT (#946122-26)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021afkg - 2022-01-28 (T+65.3d)
Image below (2022-01-28.026) was taken 65.3 days after discovery of 2021afkg
Galaxy with AGN is shown by white cross-hairs
Measured Magnitude +16.25 (Galaxy with AGN)

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-28 00:46 UT (#960100-04)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT2021afkg - 2022-02-06 (T+75.2d)
Image below (2022-02-06.963) was taken 75.2 days after discovery of 2021afkg
Galaxy with AGN is shown by white cross-hairs
Measured magnitude (galaxy + nucleus) +16.29

AT 2021agbu - Type HPM Transient (discovered 2021-12-03) in NGC 1325A (Attempt)

NGC 1325A with AT 2021agbu (Eridanus)
AT2 021agbu (Type: HPM) discovered 2021-12-03.565 UT by Hidenori Nohara
Discovery Magnitude 17.5
[ Rochester Supernova site | TNS 2021agbu ]

NGC 1325A - Spiral Galaxy

Annotated CCD Image (50% size, square root scale)
3 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-21 19:37 UT (#957074-77)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 1325A with AT 2021agbu - 2022-01-20 (T+48.2d)
Image below (2022-01-20.810) was taken 48.2 days after discovery of 2021agbu
No sign of transient object
Poor quality image (bright background)

CCD Image (100% size, square root scale, cropped)
2 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-20 19:32 UT (#956020-21)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 1325A - 2022-01-21 (T+49.2d)
Image below (2022-01-21.813) was taken 49.2 days after discovery of 2021agbu
No sign of transient object

CCD Image (100% size, square root scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-21 19:37 UT (#957074-77)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 1325A with AT 2021agbu - 2022-01-22 (T+50.2d)
Image below (2022-01-22.808) was taken 50.2 days after discovery of 2021agbu
No sign of reported transient 2021agbu

CCD Image (100% size, square root scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-22 19:33 UT (#958019-21)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agfn - Blazer Transient (discovered 2021-12-12) in PKS0735+17

PKS0735+17 with AT 2021agfn (Gemini)
AT 2021agfn (Type: Blazer) discovered 2021-12-12.159 UT by GSNST
Alias: GSNST-21cx
( Rochester Supernova site )

PKS0735+17 - Galaxy
Galaxy with transient is shown by white cross-hairs

Annotated CCD Image (50% size, square root scale)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-01 20:39 UT (#947073-77)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

PKS0735+17 with AT 2021agfn - 2022-01-01 (T+20.7d)
Image below (2022-01-01.869) was taken 20.7 days after discovery of 2021agfn
Reported transient object is shown by white cross-hairs
Measured magnitude +15.25

Annotated CCD Image (100% size, square root scale, cropped)
Image details as above

PKS0735+17 with AT 2021agfn - 2022-01-07 (T+26.8d)
Image below (2022-01-07.915) was taken 26.8 days after discovery of 2021agfn
Reported transient object is shown by white cross-hairs
Measured magnitude +15.27

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-07 22:07 UT (#950096-100)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

PKS0735+17 with AT 2021agfn - 2022-01-22 (T+40.9d)
Image below (2022-01-22.062) was taken 40.9 days after discovery of 2021agfn
Reported transient object is shown by white cross-hairs
Measured magnitude +15.36 (fading ?)

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-22 01:38 UT (#957267-71)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

PKS0735+17 with AT 2021agfn - 2022-02-08 (T+58.7d)
Image below (2022-02-08.892) was taken 58.7 days after discovery of 2021agfn
Reported transient object is shown by white cross-hairs
Measured magnitude +15.75

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-02-08 21:34 UT (#967004-08)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

PKS0735+17 with AT 2021agfn - 2022-02-22 (T+72.7d)
Image below (2022-02-22.853) was taken 72.7 days after discovery of 2021agfn
Reported transient object is shown by white cross-hairs
Measured magnitude +15.52

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-02-22 20:37 UT (#975041-45)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

PKS0735+17 with AT 2021agfn - 2022-03-05 (T+83.7d)
Image below (2022-03-05.833) was taken 83.7 days after discovery of 2021agfn
Reported transient object is shown by white cross-hairs
Measured magnitude +15.63

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-03-05 20:09 UT (#982035-39)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

PKS0735+17 with AT 2021agfn - 2022-03-19 (T+97.8d)
Image below (2022-03-19.977) was taken 97.8 days after discovery of 2021agfn
Reported transient object is shown by white cross-hairs
Measured magnitude +15.87

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-03-19 23:36 UT (#989077-81)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agiv - Type AGN Transient (discovered 2021-12-14) in Mrk 506

Mrk 506 with AT 2021agiv (Hercules)
AT 2021agiv (Type: AGN) discovered 2021-12-14.928 UT by Gaia
Alias: Gaia21fot
Alerting Magnitude 15.65
(vs Historic magnitude 16.93)
Brightening in Gaia source coincident with Seyfert I Galaxy
( Rochester Supernova site | Gaia21fot )

Mrk 506 - Galaxy

Annotated CCD Image (50% size, square root scale)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-03-15 04:00 UT (#985085-89)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Mrk 506 with AT 2021agiv - 2022-02-10 (T+57.3d)
Image below (2022-02-10.244) was taken 57.3 days after discovery of 2021agiv
Position of reported AGN transient is shown by white cross-hairs
Measured magnitude +14.85

Annotated CCD Image (150% size, square root scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2022-02-10 06:02 UT (#968308-12)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Mrk 506 with AT 2021agiv - 2022-03-15 (T+90.2d)
Image below (2022-03-15.160) was taken 90.2 days after discovery of 2021agiv
Position of reported AGN transient is shown by white cross-hairs
Measured magnitude +14.93

Annotated CCD Image (150% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-03-15 04:00 UT (#985085-89)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Mrk 506 with AT 2021agiv - 2022-03-18 (T+93.2d)
Image below (2022-03-18.169) was taken 93.2 days after discovery of 2021agiv
Position of reported AGN transient is shown by white cross-hairs
Measured magnitude +14.93 (unchanged)

Annotated CCD Image (150% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-03-18 04:12 UT (#987250-54)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Mrk 506 with AT 2021agiv - 2022-05-12 (T+148.1d)
Image below (2022-05-12.042) was taken 148.1 days after discovery of 2021agiv
Position of reported AGN transient is shown by white cross-hairs
Measured magnitude +14.98

Annotated CCD Image (150% size, square root scale, cropped)
2 x 180s exposure (average combine), 3x3 binning, C Filter
2022-05-12 01:05 UT (#1009086-87)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021agrr - Type BL Transient (discovered 2021-12-27)

AT 2021agrr (Aries)
AT 2021agrr (Type: BL) discovered 2021-12-27.856 UT by Gaia
Alias: Gaia21fuf
1 mag rise in BL Lac Type object 2MASX J01593439+1047052
Alerting magnitude 16.18 (vs historic magnitude 17.25)
( Rochester Supernova site | TNS 2021agrr | Gaia21fuf )

AT 2021agrr - 2022-01-07 (T+11.0d)
Image below (2022-01-07.811) was taken 11.0 days after discovery of 2021agrr
Position of reported transient (distinct) is shown by white cross-hairs
Measured magnitude +15.87

Annotated CCD Image (100% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-07 19:37 UT (#950057-61)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2021ahep - Type AGN Transient (discovered 2021-12-29) in UGC 1098

UGC 1098 with AT2 021ahep (Pisces)
AT 2021ahep (Type: AGN) discovered 2021-12-29.365 UT by Gaia
Alias: Gaia21fva
Gaia alert triggered at +18.15 mag
( Rochester Supernova site | Gaia21fva )

UGC 1098

Annotated CCD Image (50% size, square root scale)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-02 00:40 UT (#947174-78)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 1098 with AT 2021ahep - 2022-01-02 (T+3.7d)
Image below (2022-01-02.022) was taken 3.7 days after discovery of 2021ahep

CCD Image (125% size, square root scale, cropped)
Image details as above

UGC 1098 with AT2021ahep - 2022-01-05 (T+7.4d)
Image below (2022-01-05.801) was taken 7.4 days after discovery of 2021ahep
AGN is highlighted by white cross-hairs
Measured Mag +15.35 (AGN / Nucleus)

CCD Image (125% size, square root scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-05 19:25 UT (#949015-18)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 1098 with AT 2021ahep - 2022-01-07 (T+9.4d)
Image below (2022-01-07.753) was taken 9.4 days after discovery of 2021ahep
AGN is highlighted by white cross-hairs
Measured Mag +15.37 (AGN / Nucleus)

CCD Image (125% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, C Filter
2022-01-07 18:14 UT (#950017-21)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

This Web Page:	Astronomical Transients - 2021
Last Updated :	2024-10-23
Site Owner :	David Richards
Home Page :	David's Astronomy Web Site

David's Astronomy Pages (Deep Sky) Astronomical Transients - 2021

Galactic Transients

AT 2021axb - Type YSO? Transient (discovered 2021-01-19)

AT 2021bpy - Transient (discovered 2021-02-03)

AT 2021bur - CV Type Transient (discovered 2021-02-04)

AT 2021ckv - Type YSO Transient (discovered 2021-02-08), PR Ori

AT 2021dbp - Type CV Transient (discovered 2021-02-14)

AT 2021dma - CV Type Transient (discovered 2021/02/18)

AT 2021dmc - CV Type Transient (discovered 2021/02/17)

AT 2021dtd - Type CV Transient (discovered 2021-02-20), Be-type event

AT 2021dvd - CV Type Transient (discovered 2021-02-21)

AT 2021dwy - CV Type Transient (discovered 2021-02-22)

AT 2021gux - Type CV Transient , TT Boo (discovered 2021-03-21)

AT 2021gyc - CV Type Transient (discovered 2021-03-19)

AT 2021hdk - CV Type Transient (discovered 2021-03-25)

AT 2021hfr - Ulens? Transient (discovered 2021-03-26)

AT 2021ife - Type CV Transient (discovered 2021-04-05), Attempted Observation

AT 2021kkh - Type Nova? Transient (discovered 2021-04-22), Attempted Observations

AT 2021aecv - CV Type Transient (discovered 2021-11-09)

AT 2021aeft - CV Type Transient (discovered 2021-11-09)

AT 2021aena - CV Type Transient (discovered 2021-11-11) (Attempt)

AT 2021aeoz - CV Type Transient (discovered 2021-11-13) (Attempt)

AT 2021aesn - CV Type Transient (discovered 2021-11-14) (Attempt)

AT 2021afdl - CV Type Transient (discovered 2021-11-22)

AT 2021agbq - Type ulens? Transient (discovered 2021-12-02)

AT 2021kmb - Transient (discovered 2021-04-22) (Attempt)

AT 2021koz - Type QSO? Transient (discovered 2021-04-28)

AT2021wuy - Type CV Transient (discovered 2021-08-22) - Attempt

AT 2021wxe - CV Type Transient (discovered 2021-08-23)

AT 2021xbh - Type Nova? Transient (discovered 2021-08-27) (Attempt)

AT 2021xmw - Type YSO Transient, V546 Mon (discovered 2021-08-30)

AT 2021xrf - Type CV? Transient (discovered 2021-09-02) - Attempt

AT 2021yel - CV Type Transient (discovered 2021-09-05)

AT 2021yjl - CV Type Transient (discovered 2021-09-06) - Attempt

AT 2021zkf - YSO Transient, V0645 Cyg (discovered 2021-09-13)

AT 2021aagc - HPM Type Transient (discovered 2021-09-26)

AT 2021agdc - CV Type Transient (discovered 2021-12-05)

AT 2021agdj - CV Type Transient (discovered 2021-12-05)

AT 2021aggy - CV Type Transient (discovered 2021-12-12)

AT 2021agjs - Ulens? Transient (discovered 2021-12-16)

AT 2021agrm - Type HPM Transient (discovered 2021-12-25)

AT 2021agpw - CV Type Transient (discovered 2021-12-27)

AT 2021agxs - CV Type Transient Star (discovered 2021-12-28)

Extragalactic Transients

M31 Transients (2021)

AT 2021fbz - Extragalactic Nova (discovered 2021-03-08) in M31 (Attempt)

AT 2021zdh - Transient (discovered 2021-09-18) in M31

AT 2021aaxp - CV Type Transient (discovered 2021-10-09) in M31

AT 2021aceg - Extragalactic Nova (discovered 2021-10-25) in M31

AT 2021yul - Nova (discovered 2021-09-13) in M110

M33 Transients (2021)

AT 2021wcf - Transient (discovered 2021-07-20) in M33

Other Extragalactic Transients (2024)

AT 2021rl - BL Type Transient (QSO 0954+658)

AT 2021bgi - AGN / Transient (discovered 2021-01-27) in 2MASX J12303540+4257559

AT 2021biy - Type LRN Transient (discovered 2021-01-29) in NGC 4631

AT 2021blu - LBV Transient (discovered 2021-02-01) in UGC 5829

AT 2021cek - Unconfirmed Transient (discovered 2021-02-06) in NGC 4041 (Unconfirmed)

AT 2021djx - Type QSO Transient (discovered 2021-02-19)

AT 2021fbu - Type AGN Transient (discovered 2021-03-06) in VV 807

AT 2021fmd - Possible Transient (discovered 2021-03-12) in NGC 3515 (Unconfirmed)

AT 2021fyd - Transient (discovered 2022-03-17) in IC 357 (unconfirmed)

AT2021hut - Type AGN Transient (discovered 2021-04-03) in PGC 48045

AT 2021ilb - Transient (discovered 2021-04-05) in M61

AT 2021irz - Transient (discovered 2021-04-07) in UGC 1977

AT 2021lwx - Type AGN Transient (discovered 2021-04-13) in Unnamed Galaxy (Attempt)

AT 2021knq - Transient (discovered 2021-04-26) in UGC 8426

AT 2021ugn - Transient (discovered 2021-07-28) in UGC 11252 (attempted observation)

AT 2021vqu - Type QSO Transient (discovered 2021-08-09)

AT 2021wkx - M Dwarf Type Transient in WISEA Galaxy (PGC 2670810)

AT 2021abbn - Transient (discovered 2021-10-07) in UGC 3383

AT 2021ably - Transient (discovered 2021-10-14) in UGC 5994

AT 2021acbu - Transient (discovered 2021-10-24) in LEDA 1352843 (faded)

AT 2021aczn - Type HPM Transient (discovered 2021-11-01) in NGC 1569

AT 2021adlx - Transient (discovered 2021-11-05) in NGC 4134 (Attempted Observation)

AT 2021afkg - AGN Transient (discovered 2021-11-23) in 2MASS J09361749+0918146

AT 2021agbu - Type HPM Transient (discovered 2021-12-03) in NGC 1325A (Attempt)

AT 2021agfn - Blazer Transient (discovered 2021-12-12) in PKS0735+17

AT 2021agiv - Type AGN Transient (discovered 2021-12-14) in Mrk 506

AT 2021agrr - Type BL Transient (discovered 2021-12-27)

David's Astronomy Pages (Deep Sky)
Astronomical Transients - 2021