David's Astronomy - Images 2025-09-09 (S1360)

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Images - Session 1360 (2025-09-09)

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Objects Session Notes

AT 2021aggw - CV Type Transient

AT 2022bvc - CV Type Transient

AT 2022wut - Transient (non-detection)

AT 2023cn - Transient (non-detection)

AT 2023hxd - CV Type Transient

AT 2023qqq - Transient (non-detection)

AT 2025fbb - Type CV? Transient (non-detection)

AT 2025nda - Type CV? Transient (non-detection)

AT 2025rcf - Type CV? Transient (non-detection)

M31 - Spiral Galaxy with EGN Type Transient AT 2025wwe

SN 2023eoc - Type Ia Supernova in WISEA Galaxy (non-detection)

- Nova Ser 2025 attempted failed (due to cloud)

Variable Stars (photometric monitoring)

- T CrB, CI Cyg, SS Cyg, AM Her, BL Lac

Nearby Stars (astrometric monitoring)

- None

- Attempted All-night session (4.8 hr), finished early at around 02:20 LT due to cloud

- 12" LX200 + ST-10XME for imaging

- TS 80mm APO + ZWO ASI178MC for guiding & imaging

- Ambient Temperature : 14°C (min).

- CCD Temperature: -10°C

- Notes from 2025-09-09 >>

-

Observing Result

AT 2021aggw - CV Type Transient

AT 2021aggw (Aquila)
AT 2021aggw (Type: CV) discovered 2021-12-12.402 UT by Gaia
Alias: Gaia21fnl
Discovery Magnitude 15.27 (G-Gaia Filter)
vs Historic Magnitude 15.43 +/- 0.03 SD
Gaia source brightens by ~0.2 mag
( TNS 2021aggw | Gaia21fnl )

AT 2021aggw - 2025-09-09 (T+1367.6d)
Image below (2025-09-09.978) was taken 1367.6 days after discovery of 2021aggw
Position of earlier transient (very faint) is shown by white cross-hairs
Limiting Magnitude +16.0 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
3 x 60s exposure (average combine), 3x3 binning, Clear Filter
2025-09-09 23:32 UT (#1360070-74)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2021aggw on Transients 2021 Page >>

AT 2022bvc - CV Type Transient

AT 2022bvc (Cygnus)
AT 2022bvc (Type: CV) discovered 2022-02-08.960 UT by Gaia
Alias: Gaia22ang
Discovery Magnitude 15.27 (G-Gaia Filter)
vs Historic Magnitude 15.43 +/- 0.03 SD
Gaia source brightens by ~0.2 mag
( TNS 2022bvc | Gaia22ang )

AT 2022bvc - 2025-09-09 (T+1309.0d)
Image below (2025-09-09.994) was taken 1309.0 days after discovery of 2022bvc
Position of earlier transient (faint) is shown by white cross-hairs
Limiting Magnitude +15.38 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, Clear Filter
2025-09-09 23:55 UT (#1360089-93)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2022bvc Transients 2022 Page >>

AT 2022wut - Transient (non-detection)

AT 2022wut (Aquila)
AT 2022wut (Type: unk) discovered 2022-10-05.190 UT by ZTF
Alias: ZTF22ablcjkn
( TNS 2022wut )

AT 2022wut - 2025-09-10 (T+1070.8d)
Image below (2025-09-10.012) was taken 1070.8 days after discovery of 2022wut
Position of reported transient (not visible) is indicated by white cross-hairs.
Very poor quality image (due to cloud / poor sky transparency)

Annotated CCD Image (125% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-09-10 00:25 UT (#1360107-11)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2022wut - Earlier Image, 2023-08-08 (T+307.8d)
Image below (2023-08-08.961) was taken 307.8 days after discovery of 2022wut
Position of reported transient (no longer visible) is indicated by white cross-hairs.

Annotated CCD Image (125% size, square root scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, Clear Filter
2023-08-08 23:09 UT (#1127033-35)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2022wut on Transients 2022 Page >>

AT 2023cn - Transient (non-detection)

AT 2023cn (Hercules)
AT 2023cn (Type: unk) discovered 2023-01-05.802 UT by Gaia
Alias: Gaia23ade, ZTF23aaahwws
Alias: ZTF22ablcjkn
Discovery Magnitude 16.72 (G-Gaia Filter)
No prior historic data (Gaia)
Transient on blue PanSTARRS source
Gaia, 2023-01-05 19:15:30, mag 16.72
Gaia, 2023-01-06 01:15:45, mag 16.70
Gaia, 2023-01-14 17:37:08, mag 17.35
Gaia, 2023-01-15 05:37:38, mag 17.43
Gaia, 2023-01-15 11:37:53, mag 17.51
( TNS 2023cn | Gaia23ade)

AT 2023cn - 2025-09-09 (T+978.1d)
Image below (2025-09-09.924) was taken 978.1 days after discovery of 2023cn
Position of reported transient (not visible) is indicated by white cross-hairs.
Non-Detection Limiting Magnitude +17.0 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-09-09 22:15 UT (#1360035-37)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2023cn on Transients 2023 Page >>

AT 2023hxd - CV Type Transient

AT 2023hxd (Aquila)
AT 2023hxd (Type: CV) discovered 2023-05-11.245 UT by MASTER
Alias: MASTER OT J190920.77+004831.4
Discovery magnitude 13.4 (Clear filter)
( TNS 2023hxd)

AT 2023hxd - 2025-09-09 (T+852.7d)
Image below (2025-09-09.964) was taken 852.7 days after discovery of 2023hxd
Position of earlier transient (faint) is shown by white cross-hairs
Measured Magntitude +14.28 (Clear Filter)
Poor quality image

Annotated CCD Image (150% size, linear scale, cropped)
3 x 60s exposure (average combine), 3x3 binning, Clear Filter
2025-09-09 23:11 UT (#1360053-57)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2023hxd on Transients 2023 Page >>

AT 2023qqq - Transient (non-detection)

AT 2023qqq (Delphinus)
AT 2023qqq (Type: unk) discovered 2023-08-15.268 UT by ZTF
Alias: ZTF23aaxvtnh
Discovery magnitude 16.03 (r-ZTF filter)
vs Prior Non-Detection Limiting Magnitude 20.51
( TNS 2023qqq )

AT 2023qqq - 2025-09-10 (T+756.8d)
Image below (2025-09-10.027) was taken 756.8 days after discovery of 2023qqq
Position of earlier transient (not visible) is shown by white cross-hairs
Non-Detection Limiting Magntitude +17.2 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-09-10 00:46 UT (#1360115-18)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2023qqq on Transients 2023 Page >>

AT 2025fbb - Type CV? Transient (non-detection)

AT 2025fbb (Ophiuchus)
AT 2025fbb (Type: CV?) discovered 2025-03-20.899 UT by XOSS
Alias: KATS25F019, TCP J18441632+1114538
Discovery magnitude 16.91 (Clear Filter)
CV candidate classified by XOSS
( TNS 2025fbb )

AT 2025fbb - 2025-09-09 (T+173.1d)
Image below (2025-09-09.949) was taken 173.1 days after discovery of 2025fbb
Position of earlier transient (not visible) is shown by white cross-hairs
Non-Detection Limiting Magntitude +16.3 (Clear Filter)
Poor quality image (single frame)

Annotated CCD Image (100% size, linear scale, cropped)
180s exposure (single frame), 3x3 binning, Clear Filter
2025-09-09 22:47 UT (#1360045)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025fbb on Transients 2025 Page >>

AT 2025nda - Type CV? Transient (non-detection)

AT 2025nda (Hercules)
AT 2025nda (Type: CV?) discovered 2025-06-08.776 UT by XOSS
Alias: KATS25L001, TCP J18345128+2209168
Discovery magnitude 16.78 (Clear Filter)
CV candidate classified by XOSS
( TNS 2025nda )

AT 2025nda - 2025-09-09 (T+93.2d)
Image below (2025-09-09.943) was taken 93.2 days after discovery of 2025nda
Position of reported transient (not visible) is shown by white cross-hairs
Non-Detection Limiting Magntitude +16.9 (Clear Filter)
Poor quality image (single frame)

Annotated CCD Image (100% size, linear scale, cropped)
180s exposure (single frame), 3x3 binning, Clear Filter
2025-09-09 22:38 UT (#1360042)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025nda on Transients 2025 Page >>

AT 2025rcf - Type CV? Transient (non-detection)

AT 2025rcf (Cygnus)
AT 2025rcf (Type: CV?) discovered 2025-07-13.775 UT by XOSS
Alias: KATS25N013, TCP J20581282+2955099
Discovery magnitude 16.53 (Clear Filter)
CV candidate classified by XOSS
( TNS 2025rcf )

AT 2025rcf - 2025-09-10 (T+58.3d)
Image below (2025-09-10.040) was taken 58.3 days after discovery of 2025rcf
Position of reported transient (not visible) is shown by white cross-hairs
Non-Detection Limiting Magntitude +16.2 (Clear Filter)
Poor quality image (bright moonlit sky background & low SN)

Annotated CCD Image (100% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-09-10 01:07 UT (#1360121-25)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025rcf on Transients 2025 Page >>

M31 - Spiral Galaxy with EGN Type Transient AT 2025wwe (non-detection)

M31 with AT 2025wwe (Andromeda)
AT 2025wwe (Type: EGN) discovered 2025-09-04.455 UT by ZTF
using Palomar 1.2m Oschin Telescope
Alias: ZTF25aborgma, PNV J00431125+4146081
Discovery Magnitude 17.86 (g-ZTF Filter)
Bright (m_peak <= 18.5) transient candidate identified autonomously by BTSbot
( TNS 2025wwe )

Nova M31 AT 2025wwe - 2025-09-09 (T+5.4d)
Image below (2025-09-09.869) was taken 5.4 days after discovery of 2025wwe
Position of reported transient (not visible) is shown by white cross-hairs
Non-Detection Limiting Magnitude +17.60 (Clear Filter)
Poor quality image (thin cloud, bright moonlit sky background)

Annotated CCD Image (125% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-09-09 21:00 UT (#1360005-09)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025wwe (in M31) on Transients 2025 Page >>

SN 2023eoc - Type Ia Supernova in WISEA Galaxy (non-detection)

SN 2023eoc (Draco)
Alias: In WISEA J161130.45+522745.5
SN 2023eoc (Type: Ia) discovered 2023-04-04.810 UT by XOSS
Alias: PSP23F, ZTF23aaejwfe
Discovery magnitude 17.43 (Clear Filter)
( TNS 2023eoc )

SN 2023eoc - 2025-09-09 (T+889.1d)
Image below (2025-09-09.900) was taken 889.1 days after discovery of 2023eoc
Position of earlier supernova (not visible) is shown by white cross-hairs
Non-Detection Limiting Magntitude +15.7 (Clear Filter)
Poor quality image (bright moonlit sky background, single frame)

Annotated CCD Image (100% size, linear scale, cropped)
180s exposure (single frame), 3x3 binning, Clear Filter
2025-09-09 21:36 UT (#1360030)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2023eoc (in WISEA Galaxy) on Supernova 2023 Page >>

This Web Page:	Images - Session 1360 (2025-09-09)
Last Updated :	2025-09-18
Site Owner :	David Richards
Home Page :	David's Astronomy Web Site

David's Astronomy Pages Images - Session 1360 (2025-09-09)