David's Astronomy Pages Images - Session 1377 (2025-11-24)

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Image (S1378)

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Session Notes

3I/ATLAS - Interstellar Comet C/2025 K1 (ATLAS) - Comet     AT 2022obq - CV Type Transient AT 2023hxd - CV Type Transient AT 2025absq - Transient  (non-detection) AT 2025acvr - CV Type Transient   NGC 678 & NGC 680 - Galaxies (part of NGC 691 Group) NGC 1300 - Spiral Galaxy with Type IIP Supernova 2022acko     UGCA 3 - Irregular Galaxy (PGC 721)     - NGC 2170 attempt failed (due to bad guiding)   Variable Stars (photometric monitoring) - SY Cnc, SS Cyg, RZ LMi, BL Lac     Nearby Stars (astrometric monitoring) - None

- All-Night Night Session (11.1 hr) interrupted several times by cloud and occasional light rain showers - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature:  -x°C (min) - CCD Temperature:  -20° - Notes from 2025-11-24 >>     -       -

Observing Result

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3I/ATLAS - Interstellar Comet

3I/ATLAS - 2025-11-25  (passing through Virgo) Sun Distance 1.67 AU Earth Distance 1.98 AU (296.1 million km) (poor guiding, single frame)		3I/ATLAS - 2025-11-25 Detail  Alias: C/2025 N1 (ATLAS) Autoguided on offset star using PHD2 without Lock Shift (Ra -119.41 arcsec/hr, Dec 41.88 arcsec/hr) (poor guiding, single frame)
Annotated CCD Image (50% size, square root scale) 60s exposure (single frame), 3x3 binning, C Filter 2025-11-25 06:09 UT (#1377098) 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) Image details as left
Images of 3I/Atlas on Comets 2025 Page >>

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C/2025 K1 (ATLAS) - Comet

C/2025 K1 (ATLAS) - 2025-11-25 (passing through Ursa Major) Sun Distance 1.20 AU (receeding) Earth Distance 0.40 AU (60.1 million km)		C/2025 K1 (ATLAS) - 2025-11-25 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra -427.5 arcsec/hr, Dec 540.9 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 30s exposure (single frame), 3x3 binning, Clear Filter 2025-11-25 04:54 UT (#1377069) 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) 30 x 30s exposure (average combine), 3x3 binning, Clear Filter 2025-11-21 00:51 UT (#1375142-71) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2
Annotated CCD Image (175% size, square root scale, cropped) Image details as above right		Annotated CCD Image (175% size, square root scale, cropped) Image details as above
Images of C/2025 K1 (ATLAS) on Comets 2025 Page >>

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AT 2022obq  - CV Type Transient

AT 2022obq (Andromeda) AT 2022obq (Type: CV) discovered 2022-07-01.104 UT by Gaia using Gaia Spacecraft Telescope Alias: Gaia22cti

Alerting Magnitude 13.15 (G-Gaia Filter) vs Historic Magnitude 15.23 +/- 0.87 SD Outburst in known CV LX And

( TNS 2022obq | Gaia22cti )

AT 2022obq - 2025-11-24 (T+1242.8d)

Image below (2025-11-24.907) was taken 1242.8 days after discovery of 2022obq

Position of earlier transient (faint) is shown by white cross-hairs Measured Magnitude +15.98 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-11-24 21:49 UT (#1377039-43) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2022obq on Transients 2022 Page  >>

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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 13.40 (Clear Filter) vs Prior Non-Detection Limiting Magnitude 17.10 (Clear Filter)

( TNS 2023hxd )

AT 2023hxd - 2025-11-24 (T+928.6d)

Image below (2025-11-24.806) was taken 928.6 days after discovery of 2023hxd

Position of earlier transient (faint) is shown by white cross-hairs Measured Magnitude +14.81 (Clear Filter)

Annotated CCD Image (150% size, linear scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2025-11-24 19:24 UT (#1377006-10) 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  >>

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AT 2025absq  - Transient  (non-detection)

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 - 2025-11-24 (T+32.2d)

Image below (2025-11-24.878) was taken 32.2 days after discovery of 2025absq

Position of earlier transient (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +19.9 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-11-24 21:13 UT (#1377030-34) 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 2025acvr  - CV Type Transient

AT 2025acvr (Ursa Major) AT 2025acvr (Type: CV) discovered 2025-11-08.492 UT by ZTF Alias: ZTF25acdhetm, GOTO25jsd

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

( TNS 2025acvr )

AT 2025acvr - 2025-11-25 (T+16.7d)

Image below (2025-11-25.155) was taken 16.7 days after discovery of 2025acvr

Position of earlier transient (faint) is shown by white cross-hairs Measured Magnitude +17.41 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 180s exposure (single frame), 3x3 binning, Clear Filter 2025-11-25 03:43 UT (#1377065) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2025acvr on Transients 2025 Page  >>

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 NGC 678 & NGC 680 - Galaxies (part of NGC 691 Group)

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NGC 1300  - Spiral Galaxy with Type IIP Supernova 2022acko

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)

( TNS 2022acko | Gaia23aap )

NGC 1300 with SN 2022acko - 2025-11-24 (T+1084.8d)

Image below (2025-11-24.916) was taken 1084.8 days after discovery of 2022acko

Position of earlier supernova (not visible) is shown by white cross-hairs Measured Magnitude +18.0 (Clear Filter)

Annotated CCD Image (100% size, square root scale, cropped) 2 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-11-24 22:02 UT (#1377047-48) 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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UGCA 3  - Irregular Galaxy (PGC 721)

UGCA 3 (Cetus) Alias: PGC 721 (catalog mag +15.4)

[ UGCA Galaxies ]

Annotated CCD Image (125% size, square root scale, cropped) 2 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-11-24 19:46 UT (#1377018-19) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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