David's Astronomy Pages Images - Session 1238 (2024-09-04)

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Images (S1239)

Objects	Session Notes
AT 2023abqc - CV Type Transient     Variable Stars (photometric monitoring) - None     Nearby Stars (astrometric monitoring) - Groombridge 34	- Short pre-dawn session (0.8 hrs), start of automated session delayed by cloud.     - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature: 13°C (min) - CCD Temperature:   -10°C - Notes from 2024-09-04 >>

Observing Result

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AT 2023abqc - CV Type Transient

AT 2023abqc (Cygnus) AT 2023abqc (Type: CV) discovered 2023-12-25.743 UT by Gaia Alias: Gaia23duj Discovery Magnitude 16.86 (G-Gaia Filter) vs Historic Magnitude 19.95 +/- 1.38 SD Outburst in candidate CV ASASSN-19mf  ( TNS 2023abqc | Gaia23duj )

AT 2023abqc - 2024-09-05 (T+254.4d) Image below (2024-09-05.125) was taken 254.4 days after discovery of 2023abqc or around 4 days after last outburst on c. 2024-09-01 Position of reported transient (faint, fading) is shown by white cross-hairs Measured Magnitude +16.78 (Clear Filter) It appears the image likely confirms a new outburst in this candidate CV but that it is now fading again (Gaia data shows that this object's normal Low Stand Magnitude is in range +20.2 to +21.1)

Annotated CCD Image (100% size, linear scale, cropped) 2 x 60s exposure (average combine), 3x3 binning, Clear Filter 2024-09-05 03:02 UT (#1238005-06) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2023abqc on Transients 2023 Page >>

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