David's Astronomy Pages CCD Images - Session 873 (2021-03-21)

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C/2020 T2 (Palomar) - Comet     AT 2021dtd - Type CV Transient     IC 863 - Spiral Galaxy with Type IIn Supernova 2021foa IC 992 - Spiral Galaxy with Type Ic Supernova 2021dwg LEDA 1634284 - Galaxy with Type Ia Supernova 2021bkw MCG +6-30-84 - Galaxy (PGC 48870) with Type Ia Supernova 2021K     NGC 3515 - Spiral Galaxy with Possible Transient AT 2021fmd NGC 3987 - Spiral Galaxy NGC 3993 - With NGC 3987, NGC 3989 & NGC 3997 NGC 3993 - Spiral Galaxy NGC 3997 - Spiral Galaxy NGC 4015 - Spiral Galaxy (ARP 138) with NGC 4021 & NGC 4023 NGC 4227 - Spiral Galaxy with Type Ia Supernova 2021biz NGC 4533 - Spiral Galaxy with Type II Supernova 2021bug (attempt) NGC 4631 - Spiral Galaxy with Type LRN Transient AT2021biy NGC 5018 - Elliptical Galaxy with Type Ia Supernova 2021fxy     UGC 7522 - Spiral Galaxy (PGC 40621)       - AT2021ckv attempt failed (due to cloud)     Variable Stars (photometric monitoring) - BL Lac, CY Lyr     Nearby Stars (astrometric monitoring) - None

- All Night session (8.2 hours) - Main aims of the session were to acquire a selection of variable star, nearby star and comet targets and deep sky targets - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature: -0.5°C (min) - CCD Temperature:  -20°/25°C - Notes from 2021-03-21 >>    [ Local Files >> ]   -

C/2020 T2 (Palomar) - Comet

C/2020 T2 (Palomar) (passing through Canes Venatici) Sun Distance 2.44 AU (approaching) Earth Distance 1.62 AU (242.9 million km) Comet indicated by white cross-hairs		C/2020 T2 (Palomar) - 2021-03-22, Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra -6.94 arcsec/hr, Dec 13.70 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 3 x 45s exposure (average combine), 3x3 binning, C Filter 2021-03-22 03:05 UT (#873082-84) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2		CCD Image (100% size, log scale, cropped) 14 x 45s exposure (average combine), 3x3 binning, C Filter 2021-03-22 03:09 UT (#873082-96) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2
Images of C/2020 T2 (Palomar) on Comets 2021 Page >>

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AT 2021dtd - Type CV Transient, 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

AT 2021dtd - 2021-03-22 (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

Images of AT 2021dtd on Transients 2021 Page >>

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IC 863 - Spiral Galaxy with Type IIn Supernova 2021foa

IC 863 with SN2021foa (Virgo) SN 2021foa (Type: IIn) discovered 2021/03/15.450 UT by ASAS-SN Alias: ASASSN-21dg Discovery Magnitude 15.9 (g-Sloan Filter) vs Prior Non-Detection Limiting Magnitude 17.9  ( Rochester Supernova site | Discovery Image | TNS 2021foa )

IC 863 with SN 2021foa - 2021-03-22 (T+6.6d) Image below (2021-03-22.010) was taken 6.6 days after discovery of 2021foa SN is indicated by white cross-hairs.  Measured magnitude +15.02 (for SN)

Annotated CCD Image  (150% size, square root scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, C Filter 2021-03-22 00:22 UT (#873030-33) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2021foa (IC 863) on Supernovae 2021 Page >>

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IC 992 - Spiral Galaxy with Type Ic Supernova 2021dwg

IC 992 with SN 2021dwg (Virgo) SN 2021dwg (Type: Ic) discovered 2021/02/27.420 UT by ZTF Alias: ZTF21aannoix Magnitude +18.44 at discovery  ( Rochester Supernova site | TNS 2021dwg )

IC 992 with SN 2021dwg - 2021-03-22 (T+22.7d) Image below (2021-03-22.099) was taken 22.7 days after discovery of 2021dwg Position of SN (distinct) is shown by white cross-hairs Measured magnitude +17.39

Annotated CCD Image  (125% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, C Filter 2021-03-22 02:31 UT (#873069-73) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2021dwg (IC 992) on Supernovae 2021 Page >>

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LEDA 1634284 - Galaxy with Type Ia Supernova 2021bkw

LEDA 1634284 with SN 2021bkw (Bootes) SN 2021bkw (Type: Ia) discovered 2021/01/31.553 UT by ATLAS Alias: ATLAS21dhp [ Supernovae ]  (Rochester Supernova site | Gianluca Masi image  )

LEDA 1634284 with SN 2021bkw - 2021-03-22 (T+49.6d) Image below (2021-03-22.113) was taken 49.6 days after discovery of 2021bkw Measured Magnitude +15.91 (SN + Host Galaxy Nucleus)

Annotated CCD Image  (150% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, C Filter 2021-03-22 02:51 UT (#873076-80) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2021bkw (LEDA 1634284) on Supernovae 2021 Page >>

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MCG +6-30-84 - Galaxy (PGC 48870) with Type Ia Supernova 2021K

MCG +6-30-84 / PGC 48870 with SN 2021K (Canes Venatici) MCG +6-30-84 / Alias SN 2021K (Type: Ia) discovered 2021/01/01.490 UT by ZTF  Alias: ZTF21aaabvjk, Gaia21acj  (Rochester Supernova site | ZTF observations | )

MCG +6-30-84 with SN 2021K - 2021-03-22 (T+79.7d) Image below (2021-03-22.140) was taken 79.7 days after discovery of 2021K SN is shown by white cross hairs.  Measured magnitude +15.29 (SN + Galaxy Centre) vs  Host Galaxy Catalog Mag +15.29

Annotated CCD Image  (125% size, square root scale, cropped) 180s exposure (single frame), 3x3 binning, C Filter 2021-03-22 03:25 UT (#873098) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2021K (MCG +6-30-84) on Supernovae 2021 Page >>

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NGC 3515 - Spiral Galaxy with Possible Transient AT 2021fmd

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 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

Images of AT 2021fmd (NGC 3515) on Transients 2021 Page >>

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NGC 3987 - Spiral Galaxy

NGC 3987 (Leo)

Annotated CCD Image (50% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, C Filter 2021-03-22 01:48 UT (#873054-58) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 3987 - Detail

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

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

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NGC 3993 - With Surrounding Galaxies (NGC 3987, NGC 3989 & NGC 3997)

NGC 3993 with surrounding galaxies (Leo) NGC 3993 with NGC 3987, NGC 3989 & NGC 3997 Ast.Now Deep Sky Challenge Object, Apr 2021  [ Deep Sky Challanges (Ast.Now) ] Unexplained light artefact in lower left of image

Annotated CCD Image (100% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, C Filter 2021-03-22 01:48 UT (#873054-58) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 3993 with surrounding galaxies - Negative Unexplained light artefact in lower left of image

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

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NGC 3993 - Spiral Galaxy

NGC 3993  (Leo) Ast.Now Deep Sky Challenge Object, Apr 2021  [ Deep Sky Challanges (Ast.Now) ]

Annotated CCD Image (50% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, C Filter 2021-03-22 01:48 UT (#873054-58) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 3993 - Detail

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

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

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NGC 3997 - Spiral Galaxy

NGC 3997 (Leo)

Annotated CCD Image (50% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, C Filter 2021-03-22 01:48 UT (#873054-58) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 3997 - Detail

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

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

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NGC 4015 - Spiral Galaxy (ARP 138) with NGC 4021 & NGC 4023

NGC 4015 (Coma Berenices) Alias: NGC 4015 (ARP 138) with NGC 4021 & NGC 4023 Ast.Now Deep Sky Challenge Object, Apr 2021 [ ARP Galaxies ]  [ Deep Sky Challanges (Ast.Now) ]

NGC 4015, NGC 4021 & NGC 4023 with other galaxies in field of view: NGC 4005 & NGC 4011 Suboptimal image (single sub only) Target to be rescheduled for a future session

Annotated CCD Image (50% size, square root scale) 180s exposure (single frame), 3x3 binning, C Filter 2021-03-21 23:20 UT (#873010) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 4015 (ARP 138) Suboptimal image (single sub only) Target to be rescheduled for a future session

Annotated CCD Image (150% size, square root scale, cropped) 180s exposure (single frame), 3x3 binning, C Filter 2021-03-21 23:20 UT (#873010) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2 [ See Later Image 2021-03-22 (S874) ]

NGC 4015 (ARP 138) - Earlier Image (2008)

Annotated CCD Image 5 x 3 min exposure (average combine), 2x2 binning, C Filter 2008-02-16 05:28 h UT (#264512-16) 8" LX200 Classic + ST-7E

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NGC 4227 - Spiral Galaxy with Type Ia Supernova 2021biz

NGC 4227 with SN 2021biz (Canes Venatici) SN 2021biz (Type: Ia) discovered 2021/01/29.543 UT by ATLAS Alias: ATLAS21dfz  (Rochester Supernova site | Gianluca Masi image | Jean-Claude Merlin image )

NGC 4227 with SN 2021biz - 2021-03-22 (T+51.5d) Image below (2021-03-22.022) was taken 51.5 days after discovery of 2021biz SN shown by white cross hairs.  Measured magnitude +16.87

Annotated CCD Image (125% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, C Filter 2021-03-22 00:41 UT (#873035-39) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2021biz (NGC 4227) on Supernovae 2021 Page >>

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NGC 4533 - Spiral Galaxy with Type II Supernova 2021bug (Attempt)

NGC 4533 with SN2021bug (Virgo) SN 2021bug (Type: II) discovered 2021/02/04.413 UT by ZTF Alias: ZTF21aagydmn, ATLAS21dqt Discovery Magnitude 18.29  ( Rochester Supernova site | TNS 2021bug )

NGC 4533 with SN 2021bug - 2021-03-21 (T+45.6d) Image below (2021-03-21.994) was taken 45.6 days after discovery of 2021bug Reported position of SN (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 2021-03-22 00:02 UT (#873022-26) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2021bug (NGC 4533) on Supernovae 2021 Page >>

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NGC 4631 - Spiral Galaxy with Type LRN Transient AT2021biy

NGC 4631 with AT2021biy (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 ) LRN = Luminous Red Nova [ LRN Transients ]

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

Images of AT 2021biy (NGC 4631) on Transients 2021 Page >>

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NGC 5018 - Elliptical Galaxy with Type Ia Supernova 2021fxy

NGC 5018 with SN 2021fxy (Virgo) SN 2021fxy (Type: Ia) discovered 2021/03/17.725 UT by Koichi Itagaki Discovery Mag 16.9 (Clear Filter)  ( Rochester Supernova site | Discovery Image | Paolo Campaner image ) ( TNS 2021fxy )

NGC 5018 with SN 2021fxy - 2021-03-22 (T+4.4d) Image below (2021-03-22.084) was taken 4.4 days after discovery of 2021fxy SN is indicated by white cross-hairs.  Measured magnitude + 14.61

Annotated CCD Image  (100% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, C Filter 2021-03-22 02:10 UT (#873062-66) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2021fxy (NGC 5018) on Supernovae 2021 Page >>

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UGC 7522 - Spiral Galaxy (PGC 40621)

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