Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

TCP J18080786+6244515

TCP J18080786+6244515   2025 01 01.8481*  18 08 07.86 +62 44 51.5  12.6 U             Dra       9 1 

2025 01 01.84808

Discovered by Hideo Nishimura and Shizuo Kaneko, Kakegawa, Shizuoka, Japan on three frames (30-s exp. limiting mag 16) using Canon EOS 6D digital camera + 200-mm F/3.0 lens. Nothing is visible at this location on the frames taken on 2024 Dec. 31.87797 UT (limiting mag 14.8) and 2024 Dec. 28.81307 UT (limiting mag 15.8) by same instrument. --- Isao Endoh and Hitoshi Yamaoka(NAOJ)

2025 01 02.376

http://k-itagaki.jp/images/TCP-Dra.jpg

2025 01 01.8016

No object brighter than 13.5 CV was visible in the image obtained on 2025-01-01.8016 UT (1h 7min prior to discovery) by the NMW survey's ( http://scan.sai.msu.ru/nmw/ ) 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/ ). The object Gaia DR3 2159386170608968576 (BPmag= 21.01 +/-0.13, RPmag= 17.58 +/-0.01, Plx= 9.6 +/-0.2 mas) is located about 1.5 arcsec from the reported position, suggesting that the transient may be a flare of a previously unknown UV Ceti type variable. ---- Kirill Sokolovsky, Alexander Getmansky, Stanislav Korotkiy (Astroverty, Ka-Dar) for the NMW survey team