David's Astronomy Pages Images - Session 1389 (2025-12-30)

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Session Notes

29P/Schwassmann-Wachmann - Comet   AT 2022cpr - CV Type Transient AT 2023ae - CV Type Transient  (non-detection)   LEDA 924001 - Galaxy M31 - Spiral Galaxy with Transient AT 2025ahch  (non-detection) M31N 2025-10a? - Extragalactic Nova in M31   NGC 3106 - Spiral Galaxy with Type Ia Supernova 2025aauj in M31 NGC 5332 - Elliptical Galaxy with Type II Supernova 2023jkq in M31   SBS 1301+594 - Galaxy with Type Ia Supernova 2024flj   UGCA 312 - Irregular Galaxy (PGC 44549) UGC 4316 - Spiral Galaxy with Type Ic Supernova 2025advo UGC 5381 - Spiral Galaxy with Transient AT 2025ahep   Variable Stars (photometric monitoring) - U And, T CrB, CI Cyg, BL Lac, CY Lyr   - TT Ari, SS Cyg attempt failed (due to occluded view)   Nearby Stars (astrometric monitoring) - Gliese 65 (UV Cet)   - 61 Cyg attempt failed (due to occluded view)

- All-Night Session (13 hrs) interrupted by cloud - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature: 0°C (min) - CCD Temperature:  -20°/-25°C - Notes from 2025-12-30 >> - -

Observing Result

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29P/Schwassmann-Wachmann  - Comet

29P/Schwassmann-Wachmann - 2025-12-31 (passing through Leo) Sun Distance 6.31 AU Earth Distance 6.00 AU (897.1 million km)		29P/Schwassmann-Wachmann - 2025-12-31 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra 1.7 arcsec/hr, Dec -4.6 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 3 x 90s exposure (average combine), 3x3 binning, Clear Filter 2025-12-31 04:38 UT (#1389107-09) 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) 9 x 90s exposure (average combine), 3x3 binning, Clear Filter 2025-12-31 04:43 UT (#1389107-15) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2
Images of Comet_29P_Schwassmann-Wachmann on Comets 2025 Page  >>

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AT 2022cpr  - CV Type Transient

AT 2022cpr (Virgo) AT 2022cpr (Type: CV) discovered 2022-02-15.964 UT by Gaia using Gaia Spacecraft Telescope Alias: Gaia22aqf

Discovery Magnitude 16.90 (G-Gaia Filter) ~0.2 mag slow rise in Gaia/WISE source Alerting Magnitude 16.90 vs Historic Magnitude 17.19 +/- 0.09 SD

( TNS 2022cpr | Gaia22aqf )

AT 2022cpr - 2025-12-31 (T+1414.3d)

Image below (2025-12-31.275) was taken 1414.3 days after discovery of 2022cpr

Position of earlier transient (faint) is shown by white cross-hairs Measured Magnitude +16.45 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 60s exposure (single frame), 3x3 binning, Clear Filter 2025-12-31 06:36 UT (#1389155) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2022cpr on Transients 2022 Page  >>

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AT 2023ae  - CV Type Transient  (non-detection)

AT 2023ae (Hydra) AT 2023ae (Type: CV) discovered 2023-01-01.890 UT by Gaia using Gaia Spacecraft Telescope Alias: Gaia23abi

Discovery Magnitude 15.26 (G-Gaia Filter) 4 mag outburst in candidate CV ASASSN-15hp Alerting Magnitude 15.26 vs Historic Magnitude 18.80 +/- 1.23 SD 4 mag outburst in candidate CV ASASSN-15hp

( TNS 2023ae | Gaia23abi )

AT 2023ae - 2025-12-31 (T+1094.3d)

Image below (2025-12-31.184) was taken 1094.3 days after discovery of 2023ae

Position of earlier transient (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +18.2 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-12-31 04:28 UT (#1389099-103) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2023ae on Transients 2023 Page  >>

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LEDA 924001  - Galaxy

LEDA 924001 (Crater)

( TNS 2022ztk )

Annotated CCD Image (150% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-12-31 03:49 UT (#1389084-88) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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M31  - Spiral Galaxy with Transient AT 2025ahch  (non-detection)

M31 with AT 2025ahch (Andromeda) AT 2025ahch (Type: unk) discovered 2025-12-16.528 UT by XOSS Alias: PSP25W, PNV J00422038+4114207, M31N 2025-12d, PNV J00422066+4114212

Discovery Magnitude 17.60 (Clear Filter) Nova candidate classified by XOSS. Details can be found at http://xjltp.china-vo.org/psp25w.html

( TNS 2025ahch )

M31 with AT 2025ahch - 2025-12-30 (T+14.3d)

Image below (2025-12-30.833) was taken 14.3 days after discovery of 2025ahch

Position of earlier transient (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +17.3 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-12-30 20:09 UT (#1389049-53) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025ahch on Transients 2025 Page  >>

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M31N 2025-10a? - Extragalactic Nova in M31

M31N 2025-10a? (Andromeda) Nova M31 2025-10a? (Type: unk) discovered 2025-10-17.480 UT by Koichi Itagaki Alias: TCP J00384865+4046079

M31N 2025-10a? - 2025-12-30 (T+74.3d)

Image below (2025-12-30.819) was taken 74.3 days after discovery of M31N 2025-10a?

Position of earlier transient (distinct) is shown by white cross-hairs Measured Magnitude +14.42 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-12-30 19:49 UT (#1389041-45) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of M31N 2025-10a? (in M31) on Transients 2025 Page  >>

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NGC 3106  - Spiral Galaxy with Type Ia Supernova 2025aauj in M31

NGC 3106 with SN 2025aauj (Leo Minor) SN 2025aauj (Type: Ia) discovered 2025-10-18.473 UT by ZTF using Palomar 1.2m Oschin Telescope Alias: ZTF25abxjtsp

Discovery Magnitude 17.69 (r-ZTF Filter) vs Prior Non-Detection Limiting Magnitude 19.83 (r-ZTF Filter)

( TNS 2025aauj )

NGC 3106 with SN 2025aauj - 2025-12-31 (T+73.8d)

Image below (2025-12-31.244) was taken 73.8 days after discovery of 2025aauj

Position of earlier supernova (very faint) is shown by white cross-hairs Estimated Magnitude +18.4 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-12-31 06:01 UT (#1389140-44) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2025aauj (in NGC 3106 on Supernovae 2025 Page  >>

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NGC 5332  - Elliptical Galaxy with Type II Supernova 2023jkq in M31

NGC 5332 with SN 2023jkq (Bootes) SN 2023jkq (Type: II) discovered 2023-05-25.351 UT by ATLAS using ATLAS Haleakala Telescope Alias: ATLAS23ljb

Discovery Magnitude 17.48 (orange-ATLAS Filter) vs Prior Non-Detection Limiting Magnitude 19.55 (orange-ATLAS Filter)

( TNS 2023jkq )

NGC 5332 with SN 2023jkq - 2025-12-31 (T+950.9d)

Image below (2025-12-31.204) was taken 950.9 days after discovery of 2023jkq

Position of earlier supernova (ambiguous detection) is shown by white cross-hairs Non-Detection Limiting Magnitude +19.5 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-12-31 05:03 UT (#1389118-22) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2023jkq (in NGC 5332 on Supernovae 2023 Page  >>

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SBS 1301+594  - Galaxy with Type Ia Supernova 2024flj

SBS 1301+594 with SN 2024flj (Ursa Major) SN 2024flj (Type: Ia) discovered 2024-04-03.328 UT by ZTF using Palomar 1.2m Oschin Telescope Alias: ZTF24aaiegxv, Gaia24bez

Discovery Magnitude 18.51 (g-ZTF Filter) Gaia Alerting Magnitude 17.82 Confirmed SN Ia

( TNS 2024flj | Gaia24bez )

SBS 1301+594 - Galaxy

Alias PGC 2588022 (catalog mag +18.0)

Annotated CCD Image (50% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-12-31 04:10 UT (#1389091-95) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

SBS 1301+594 with SN 2024flj - 2025-12-31 (T+636.8d)

Image below (2025-12-31.167) was taken 636.8 days after discovery of 2024flj

Position of earlier supernova (no longer visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +20.0 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-12-31 04:10 UT (#1389091-95) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2024flj (in SBS 1301+594 on Supernovae 2024 Page  >>

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UGCA 312  - Irregular Galaxy (PGC 44549)

UGCA 312 (Virgo) Alias: PGC 44549 Catalog mag +16.4

[ Irregular Galaxies ]  [ UGCA Galaxies ]

Annotated CCD Image (50% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-12-31 06:22 UT (#1389148-52) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGCA 312 - Detail

Annotated CCD Image (125% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-12-31 06:22 UT (#1389148-52) 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 - 2025-12-31 (T+44.1d)

Image below (2025-12-31.228) was taken 44.1 days after discovery of 2025advo

Position of earlier supernova (distinct) is shown by white cross-hairs Measured Magnitude +15.50 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-12-31 05:38 UT (#1389133-37) 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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UGC 5381  - Spiral Galaxy with Transient AT 2025ahep

UGC 5381 with AT 2025ahep (Leo) AT 2025ahep (Type: unk) discovered 2025-12-17.443 UT by ATLAS using Palomar 1.2m Oschin Telescope Alias: ZTF25acinfdh

Discovery Magnitude 17.51 (g-ZTF Filter) vs Prior Non-Detection Limiting Magnitude 21.01 (g-ZTF Filter) Bright (m_peak <= 18.5) transient candidate identified autonomously by BTSbot (Rehemtulla et al. 2024; arXiv:2401.15167).

( TNS 2025ahep )

UGC 5381 with AT 2025ahep - 2025-12-31 (T+13.7d)

Image below (2025-12-31.138) was taken 13.7 days after discovery of 2025ahep

Position of earlier transient (faint) is shown by white cross-hairs Estimated Magnitude +17.0 (Clear Filter)

Poor quality image (single frame)

Annotated CCD Image (150% size, square root scale, cropped) 180s exposure (single frame), 3x3 binning, Clear Filter 2025-12-31 03:18 UT (#1389080) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2025ahep (in UGC 5381) on Supernovae 2025 Page  >>

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