David's Astronomy Pages Images - Session 1381 (2025-11-30)

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Session Notes

(2) Pallas - Minor Planet C/2025 T1 (ATLAS) - Comet     Nova Ser 2025 (V691 Ser)     AT 2022xao - Type QSO Transient, QSO B0647+250 (non-detection) AT 2024eh - CV Type Transient AT 2025absq - Transient AT 2025adxl - Type CV? Transient  (non-detection)   CGCG 250-013 - Galaxy with Type Ia Supernova 2023jf  (non-detection) LEDA 68428 - Galaxy with Type Ia Supernova 2025acqv M31 2025-11c? - Extragalactic Nova in M31     Variable Stars (photometric monitoring) - RX And, BL Lac, CY Lyr   - SS Cyg attempted failed (due to cloud(     Nearby Stars (astrometric monitoring) - None

- Evening Session (4.2hr) , finished early due to cloud and later forecast rain. Cold evening -2deg C min, warming later - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature:  -2°C (min) - CCD Temperature:  -25° - Notes from 2025-11-30 >>     -       -

Observing Result

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(2) Pallas - Minor Planet

(2) Pallas - 2025-11-30 (passing through Aquarius)) Sun Distance 3.434 AU (approaching) Earth Distance 3.61 AU (540.0 million km) (Ra 37.8 arcsec/hr, Dec -8.4 arcsec/hr) Measured Magnitude +10.45 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 20s exposure (average combine), 3x3 binning, Clear Filter 2025-11-30 18:36 UT (#1381034-38) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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C/2025 T1 (ATLAS) - Comet

C/2025 T1 (ATLAS) - 2025-11-30 (passing through Vulpecula) Sun Distance 1.11 AU Earth Distance 1.18 AU (176.8 million km)		C/2025 T1 (ATLAS) - 2025-11-30 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra 164.5 arcsec/hr, Dec -187.9 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 45s exposure (single frame), 3x3 binning, Clear Filter 2025-11-30 18:43 UT (#1381041) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2		Annotated CCD Image (100% size, log scale, cropped) 10 x 45s exposure (average combine), 3x3 binning, Clear Filter 2025-11-30 18:48 UT (#1381041-50) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2
Images of C/2025 T1 (ATLAS) on Comets 2025 Page >>

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Nova Ser 2025 (V691 Ser)

Nova Ser 2025  (Serpens) Nova Ser 2025 discovered 2025-07-17.908 UT by New Milky Way Survey (TCP J18385851-0351482 - discovered 2025-07-17.909 UT by ZTF Alias: ZTF25abbsdyb, N Ser 2025, V691 Ser Discovery Magnitude 11.9

Nova Ser 2025 - 2025-11-30 (T+135.8d) Image below (2025-11-30.728) was taken 135.8 days after discovery of Nova Ser 2025 Position of nova (very faint) is shown by white cross-hairs Measured Magnitude +16.49 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-11-30 17:32 UT (#1381008-12) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Nova Ser 2025 - Earlier Image, 2025-08-09 (T+23.1d) Image below (2025-08-09.997) was taken 23.1 days after discovery Position of nova (bright) is shown by white cross-hairs Measured Magnitude +12.93 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-08-10 00:04 UT (#1346013-17) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of Nova Ser 2025 on Novae 2025 Page >>

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AT 2022xao - Type QSO Transient, QSO B0647+250  (non-detection)

AT 2022xao (Gemini) AT 2022xao (Type: QSO) discovered 2022-10-02.836 UT by Gaia Alias: Gaia22eda Alerting Magnitude 16.48 (vs Historic magnitude 15.20) Fading in known blazar QSO B0647+250  ( TNS 2022xao | Gaia22eda)

AT 2022xao - 2025-11-30 (T+1155.0d) Image below (2025-11-30.881) was taken 1155.0 days after discovery of 2022xao Position of QSO (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +14.0 (Clear Filter) Poor quality image (poor sky transparency, single frame)

Annotated CCD Image (100% size, square root scale, cropped) 180s exposure (single frame), 3x3 binning, Clear Filter 2025-11-30 21:08 UT (#1381099) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2022xao - Earlier Image, 2025-03-18 (T+898.1d) Image below (2025-03-18.888) was taken 898.1 days after discovery of 2022xao Position of QSO (faint) is shown by white cross-hairs Measured Magnitude +16.00 (Clear Filter)

Annotated CCD Image (100% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-18 21:27 UT (#1303029-33) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2022xao (QSO B0647+250) on Transients 2022 Page >>

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AT 2024eh  - CV Type Transient

AT 2024eh (Cygnus) AT 2024eh (Type: CV) discovered 2024-01-01.323 UT by Gaia using Gaia Spacecraft Telescope Alias: Gaia24abw

Discovery Magnitude 16.91 (G-Gaia Filter) Alerting Magnitude 16.91 vs Historic Magnitude 15.80 +/- 0.19 SD 1.4 mag dimming in erratic Galactic plane source

( TNS 2024eh | Gaia24abw )

AT 2024eh - 2025-11-30 (T+699.5d)

Image below (2025-11-30.790) was taken 699.5 days after discovery of 2024eh

Position of earlier transient (faint) is shown by white cross-hairs Measured Magnitude +15.49 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 4 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-11-30 19:01 UT (#1381053-57) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2024eh on Transients 2024 Page  >>

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AT 2025absq  - Transient

AT 2025absq (Cassiopeia) AT 2025absq (Type: unk) discovered 2025-10-23.635 UT by MASTER Alias: MASTER OT J010405.54+500734.9

Discovery Magnitude 16.90 (Other Filter) vs Prior Non-Detection Limiting Magnitude 21.00 (Other Filter)

( TNS 2025absq )

AT 2025absq - 2025-11-30 (T+38.2d)

Image below (2025-11-30.841) was taken 38.2 days after discovery of 2025absq

Position of earlier transient (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +18.9 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-11-30 20:20 UT (#1381086-90) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025absq on Transients 2025 Page  >>

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

AT 2025adxl (Perseus) AT 2025adxl (Type: CV?) discovered 2025-11-16.817 UT by XOSS Alias: KATS25W001, TCP J03053214+4548185

Discovery Magnitude 16.73 (Clear Filter) Cataclysmic variable candidate classified by XOSS. Details can be found at http://xjltp.china-vo.org/kats25w001.html

( TNS 2025adxl )

AT 2025adxl - 2025-11-30 (T+14.1d)

Image below (2025-11-30.888) was taken 14.1 days after discovery of 2025adxl

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

Annotated CCD Image (175% size, linear scale, cropped) 180s exposure (single frame), 3x3 binning, Clear Filter 2025-11-30 21:19 UT (#1381102) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025adxl on Transients 2025 Page  >>

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CGCG 250-013  - Galaxy with Type Ia Supernova 2023jf  (non-detection)

CGCG 250-013 with SN 2023jf (Hercules) SN 2023jf (Type: Ia) discovered 2023-01-09.456 UT by ZTF using Palomar 1.2m Oschin Telescope Alias: ZTF23aaaepzi, ATLAS23arf, Gaia23auk

Discovery Magnitude 16.76 (g-ZTF Filter) vs Prior Non-Detection Limiting Magnitude 19.91 (r-ZTF Filter) Gaia Alerting Magnitude 17.09 vs Historic Magnitude None +/- None SD Confirmed SN Ia

( TNS 2023jf | Gaia23auk )

CGCG 250-013 - Spiral Galaxy (PGC 56115)

Annotated CCD Image (50% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-11-30 17:48 UT (#1381015-19) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

CGCG 250-013 - Detail

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

CGCG 250-013 with SN 2023jf - 2025-11-30 (T+1056.3d)

Image below (2025-11-30.736) was taken 1056.3 days after discovery of 2023jf

Position of earlier supernova (likely faded & no longer visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +19.6 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-11-30 17:48 UT (#1381015-19) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2023jf (in CGCG 250-013 on Supernovae 2023 Page  >>

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LEDA 68428  - Galaxy with Type Ia Supernova 2025acqv

LEDA 68428 with SN 2025acqv (Lacerta) SN 2025acqv (Type: Ia) discovered 2025-11-05.162 UT by ZTF using Palomar 1.2m Oschin Telescope Alias: ZTF21acbfyew, GOTO25kzy

Discovery Magnitude 19.17 (g-ZTF Filter) vs Prior Non-Detection Limiting Magnitude 18.90 (g-ZTF Filter) Bright (m_peak <= 18.5) transient candidate identified autonomously by BTSbot (Rehemtulla et al. 2024; arXiv:2401.15167). Alerting Magnitude 17.09 vs Historic Magnitude None +/- None SD Confirmed SN Ia

( TNS 2025acqv )

LEDA 68428 - Galaxy w/SN 2025acqv (T+25.6d)

Annotated CCD Image (50% size, square root scale) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-11-30 18:12 UT (#1381022-26) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

LEDA 68428 with SN 2025acqv - 2025-11-30 (T+25.6d)

Image below (2025-11-30.751) was taken 25.6 days after discovery of 2025acqv

Position of earlier supernova (distinct ?) is shown by white cross-hairs Measured Magnitude (SN + Galaxy) +14.98 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-11-30 18:12 UT (#1381022-26) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2025acqv (in LEDA 68428 on Supernovae 2025 Page  >>

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M31 2025-11c? - Extragalatic Nova in M31

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