Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

TCP J16161949-2643054

TCP J16161949-2643054   2022 07 08.7848*  16 16 19.49 -26 43 05.4  11.5 U             Sco       0 0

2022 07 08.7848

The flaring object was found on NMW survey images (135 mm f/2.0 telephoto lens + unfiltered SBIG ST-8300M; https://scan.sai.msu.ru/nmw/ ). The typical astrometric uncertainty of NMW images is about 1". The transient coincides with a Young Stellar Object (YEO) candidate WSB 2. The ASAS-SN lightcurve ( https://asas-sn.osu.edu/sky-patrol/coordinate/933c0101-820d-451e-93f7-f4856a9855f2 ) shows hints of previous short-term brightenings. The Gaia DR3 6042418828224074752 object corresponding to the YSO candidate is listed in Gaia DR3 as variable. ---- Stanislav Korotkiy, Kirill Sokolovsky, Olga Smolyankina, Anna Prokudina

2022 07 08.81113

The new NMW frames taken 40 minutes after the discovery images show the object dimming by 0.6mag. It seems likely that the transient is a UV Ceti-type chromospheric flare on a YSO. The lightcurve plot, finder chart and plate-solved FITS images may be found at http://scan.sai.msu.ru/~kirx/img/TCPJ1616/ ---- Stanislav Korotkiy, Kirill Sokolovsky, Olga Smolyankina, Anna Prokudina, Sergei Ostapenko

2022 07 08.991

Position end figures 19s.46, 03".0 measured with 0.20m Hyperbolic reflector + CCD at Skygems Observatory, Namibia. J2000, Gaia DR2 positions. Visual estimate from the CCD image on July 8.991 at magnitude 14.0 using APASS V magnitude comparison stars. Andrew Pearce, Nedlands, Western Australia