Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

TCP J07222683+6220548

TCP J07222683+6220548   2025 01 20.9416*  07 22 26.83 +62 20 54.8  12.8 U             Cam       9 0

2025 01 20.9416

The transient is found in three 20s exposure images obtained with the NMW survey's wide-field camera (135mm f/2.0 telephoto lens + unfiltered ST-8300 CCD) operating at the Astroverty astrofarm in Nizhnii Arkhyz, Karachay-Cherkessia, Russia ( https://astrovert.ru/astrofarm/ ). No objects brighter than CV=14.5 (unfiltered magnitude with V zero-point set using APASS stars in the field) is visible at the previous NMW image of the field obtained ten days earlier on 2025-01-10.9233 UT. The latest ASAS-SN observation of the field was on 2025-01-20.3957 (13 hours prior to our detection) showing no object brighter than g=17 https://asas-sn.osu.edu/sky-patrol/coordinate/a04b6bc6-6c44-4e07-b250-ffa4a9d7e2ea The NMW discovery images are available at http://kirx.net/~kirx/img/TCPJ07222683+6220548/ A blue source Gaia DR3 1087501559186713472 (07:22:27.05915 +62:20:56.7450 Equinox=J2000.0 at Epoch=J2000, BP=20.00 +/-0.06, RP=20.01 +/-0.09, Plx=1.96 +/-0.53 mas) is located 2.5" from the measured position of the transient, within the few-arcsecond astrometric uncertainty of the discovery observations (8.35"/pix image scale). ---- Oxana Chernyshenko, Kirill Sokolovsky, Stanislav Korotkiy (Astroverty, Ka-Dar)

2025 01 21.4866

Photometry results were B =12.65, V =12.62, Ic =12.75. position end figures 27s.02, 56".8 using 0.20-m f/8 Ritchey-Chretien + CMOS + f/5.4 focal Reducer. Same position as Gaia EDR3 1087501559186713472. An image at URL http://orange.zero.jp/k-yoshimoto/TCP_J07222683+6220548_20250121.jpg. observed by K. Yoshimoto, Yamaguchi, Japan.

2025 01 4485

follow-up : mag is, B=12.600, V=12.593, Rc=12.587, with SCT 0.36-m f/11+ FLI 1001E CCD, 30 sec, obs by, Yasuo Sano (Nayoro Hokkaido Japan) image and Lightcurve, http://sn1997ef.web.fc2.com/sn/nova/20250121-tcpj07222683_6220548_cam.html

2025 01 26.1179

This is asteroid (5) Astraea (V=12m). We were filming this area of the sky Jan. 26.1179UT. Stanislav Korotkiy (Astroverty, Ka-Dar).

2025 01 26.1179

The previous post was about TCP J16154591-1630464.