David's Astronomy Pages Images - Session 1380 (2025-11-28)

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Session Notes

24P/Schaumasse - Comet 29P/Schwassmann-Wachmann - Comet C/2025 R2 (SWAN) - Comet     AT 2025acrt - Transient AT 2025acse - CV Type Transient     M31N 2025-10a? - Extragalactic Nova in M31 M31N 2025-11c? - Extragalactic Nova in M31     NGC 1300 - Spiral Galaxy with Type IIP Supernova 2022acko  (non-detection) NGC 2642 - Spiral Galaxy with Type Ic Supernova 2023aaby NGC 4710 - Spiral Galaxy with Type unconf Transient AT 2025acfi NGC 5448 - Spiral Galaxy with Type unconf Transient AT 2025aesq   UGCA 153 - Spiral Galaxy (PGC 25983) UGC 4316 - Spiral Galaxy with Type Ic Supernova 2025advo   - UGCA 91 attempt failed (due to Cloud)     Variable Stars (photometric monitoring) - YZ Cnc, T CrB, BL Lac, DY Per     Nearby Stars (astrometric monitoring) - None

- Late night Session (8.5hr) interrupted by cloud - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature:  1°C (min) - CCD Temperature:  -20° - Notes from 2025-11-28 >>     -       -

Observing Result

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24P/Schaumasse - Comet

24P/Schaumasse - 2025-11-29 (passing through Leo) Sun Distance 1.30 AU (approaching) Earth Distance 0.70 AU (104.1 million km)		24P/Schaumasse - 2025-11-29 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra 171.2 arcsec/hr, Dec -12.1 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 60s exposure (single frame), 3x3 binning, Clear Filter 2025-11-29 06:30 UT (#1380148) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2		Annotated CCD Image (125% size, square root scale, cropped) 8 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-11-29 06:35 UT (#1380148-55) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2
Images of 24P/Schaumasse  on Comets 2025 Page >>

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29P/Schwassmann-Wachmann - Comet

29P/Schwassmann-Wachmann - 2025-11-29 (passing through Leo) Sun Distance 6.30 AU (receeding slowly) Earth Distance 6.51 AU (974.0 million km)		29P/Schwassmann-Wachmann - 2025-11-29 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra 12.6 arcsec/hr, Dec -8.7 arcsec/hr) Passing between  PGC 156637 (catalog mag +17.1) and PGC 1107778 (catalog mag +18.2)
Annotated CCD Image (50% size, square root scale) 7 x 90s exposure (average combine), 3x3 binning, Clear Filter 2025-11-29 05:23 UT (#1380114-22) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2		Annotated CCD Image (125% size, square root scale, cropped) Image details as left
Images of 29P/Schwassmann-Wachmann on Comets 2023 Page >>
Images of 29P/Schwassmann-Wachmann on Comets 2024 Page >>
Images of 29P/Schwassmann-Wachmann on Comets 2025 Page >>

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C/2025 R2 (SWAN) - Comet

C/2025 R2 (SWAN) - 2025-11-28 (passing through Pisces) Sun Distance 1.63 AU (receeding) Earth Distance 0.93 AU (139.0 million km)		C/2025 R2 (SWAN) - 2025-11-28 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra 86.2 arcsec/hr, Dec 24.5 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 2 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-11-28 23:58 UT (#1380040-41) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2		Annotated CCD Image (100% size, square root scale, cropped) 7 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-11-29 00:01 UT (#1380040-47) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2
Images of C/2025 R2 (SWAN) on Comets 2025 Page >>

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AT 2025acrt  - Transient

AT 2025acrt (Hydra) AT 2025acrt (Type: unk) discovered 2025-11-07.220 UT by GOTO using GOTO-North Telescope Alias: GOTO25jpt, ZTF25accynmt

Discovery Magnitude 14.45 (L-GOTO Filter) vs Prior Non-Detection Limiting Magnitude 19.20 (L-GOTO Filter) This transient was discovered with the assistance of the GOTO Kilonova Seekers Citizen Scientists on Zooniverse. The candidate was flagged by volunteers: Rachel A. Ford, Henryk Krawczyk, Antonio Pasqua, M.T. Mazzucato, Ciro Sirio Perrella

( TNS 2025acrt )

AT 2025acrt - 2025-11-29 (T+22.0d)

Image below (2025-11-29.172) was taken 22.0 days after discovery of 2025acrt

Position of earlier transient (very faint) is shown by white cross-hairs Measured Magnitude +17.46 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-11-29 04:17 UT (#1380089-93) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025acrt on Transients 2025 Page  >>

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AT 2025acse  - CV Type Transient

AT 2025acse (Cygnus) AT 2025acse (Type: CV) discovered 2025-11-07.647 UT by XOSS Alias: KATS25V004, TCP J21314718+3825463

Discovery Magnitude 14.70 (Clear Filter) Cataclysmic variable candidate classified by XOSS. Details can be found at http://xjltp.china-vo.org/kats25v004.html

( TNS 2025acse )

AT 2025acse - 2025-11-28 (T+21.3d)

Image below (2025-11-28.975) was taken 21.3 days after discovery of 2025acse

Position of reported transient (very faint) is shown by white cross-hairs Measured Magnitude +16.72 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-11-28 23:33 UT (#1380028-32) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025acse on Transients 2025 Page  >>

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M31N 2025-10a? - Extragalactic Nova in M31

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M31N 2025-11c? - Extragalatic Nova in M31

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NGC 1300  - Spiral Galaxy with Type IIP Supernova 2022acko  (non-detection)

NGC 1300 with SN 2022acko (Eridanus) SN 2022acko (Type: IIP) discovered 2022-12-06.162 UT by DLT40 Alias: DLT22v, ATLAS22bnms, ZTF22abyivoq, Gaia23aap

Discovery Magnitude 16.54 (Clear Filter) vs Prior Non-Detection Limiting Magnitude 18.95 (Clear Filter) Prompt5 0.4m

( TNS 2022acko | Gaia23aap )

NGC 1300 with SN 2022acko - 2025-11-29 (T+1088.8d)

Image below (2025-11-29.008) was taken 1088.8 days after discovery of 2022acko

Position of earlier supernova (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +17.6 (Clear Filter)

Annotated CCD Image (100% size, square root scale, cropped) 2 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-11-29 00:14 UT (#1380051-52) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2022acko (in NGC 1300 on Supernovae 2022 Page  >>

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NGC 2642  - Spiral Galaxy with Type Ic Supernova 2023aaby

NGC 2642 with SN 2023aaby (Hydra) SN 2023aaby (Type: Ic) discovered 2023-12-14.540 UT by ATLAS using ATLAS Haleakala Telescope Alias: ATLAS23xjl

Discovery Magnitude 17.94 (cyan-ATLAS Filter) vs Prior Non-Detection Limiting Magnitude 19.45 (cyan-ATLAS Filter)

( TNS 2023aaby )

NGC 2642 - Spiral Galaxy

Annotated CCD Image (125% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-11-29 05:01 UT (#1380106-10) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 2642 with SN 2023aaby - 2025-11-29 (T+715.7d)

Image below (2025-11-29.203) was taken 715.7 days after discovery of 2023aaby

Position of earlier supernova (not visible) is shown by white cross-hairs Measured Magnitude, Star Only +15.16 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-11-29 05:01 UT (#1380106-10) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2023aaby (in NGC 2642 on Supernovae 2023 Page  >>

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NGC 4710  - Spiral Galaxy with Type unconf Transient AT 2025acfi

NGC 4710 with AT 2025acfi (Coma Berenices) AT 2025acfi (Type: unconf) discovered 2025-10-29.816 UT by Masayuki Iwamoto

Discovery Magnitude 13.80 (Clear Filter) Discovered by Masayuki Iwamoto, Awa, Tokushima, JAPAN.

( TNS 2025acfi )

NGC 4710 - Spiral Galaxy

Annotated CCD Image (125% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-11-29 06:15 UT (#1380141-45) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 4710 with AT 2025acfi - 2025-11-29 (T+30.4d)

Image below (2025-11-29.254) was taken 30.4 days after discovery of 2025acfi

Position of earlier transient (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +19.1 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-11-29 06:15 UT (#1380141-45) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025acfi on Transients 2025 Page  >>

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NGC 5448  - Spiral Galaxy with Type unconf Transient AT 2025aesq

NGC 5448 with AT 2025aesq (Ursa Major) AT 2025aesq (Type: unconf) discovered 2025-11-23.816 UT by Isao Endoh

Discovery Magnitude 16.00 (Clear Filter) Discovered by Masamitsu Nakamura, Hamamatsu, Shizuoka, JAPAN.

( TNS 2025aesq )

NGC 5448 with AT 2025aesq - 2025-11-29 (T+5.4d)

Image below (2025-11-29.233) was taken 5.4 days after discovery of 2025aesq

Position of earlier transient (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, Clear Filter 2025-11-29 05:45 UT (#1380126-30) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025aesq on Transients 2025 Page  >>

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UGCA 153  - Spiral Galaxy (PGC 25983)

UGCA 153 (Hydra) Alias: PGC 25983 catalog mag +15.0

UGCA 153 - Detail

Position of UGCA 153 (not visible) is shown by white circle Image taken at Altitude: 13.2°, Airmass: 4.33

Poor quality image (poor sky transparency)

Annotated CCD Image (150% size, square root scale, cropped) 180s exposure (single frame), 3x3 binning, Clear Filter 2025-11-29 04:42 UT (#1380102) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGCA 153 - Earlier Image (Mar 2025)

Position of UGCA (not visible) is shown by white circle

Poor quality image / uneven sky background / uneven transparency

Annotated CCD Image (150% size, square root scale, cropped) 3 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-19 21:05 UT (#1304049-52) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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UGC 4316  - Spiral Galaxy with Type Ic Supernova 2025advo

UGC 4316 with SN 2025advo (Hydra) SN 2025advo (Type: Ic) discovered 2025-11-17.144 UT by ATLAS using ATLAS Teide Tenerife Telescope Alias: ATLAS25ogq, ZTF25acglosh, GOTO25kkf

Discovery Magnitude 16.90 (wide-ATLAS Filter) vs Prior Non-Detection Limiting Magnitude 19.76 (wide-ATLAS Filter)

( TNS 2025advo )

UGC 4316 with SN 2025advo - 2025-11-29 (T+12.0d)

Image below (2025-11-29.165) was taken 12.0 days after discovery of 2025advo

Position of earlier supernova (distinct) is shown by white cross-hairs Measured Magnitude +15.65 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped) 2 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-11-29 04:00 UT (#1380084-85) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2025advo (in UGC 4316 on Supernovae 2025 Page  >>

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