Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

TCP J21290156+3631056

TCP J21290156+3631056   2018 03 22.7846*  21 29 01.56 +36 31 05.6  11.5 U             Cyg       7 0

2018 03 22.785

Discovered by T. Kojima, Gunma-ken, Japan, on three frames with five second exposure using Canon EOS 6D digital camera + 200-mm f/3.2 lens under the limiting mag = 13.8, who writes nothing is visible at this location on the previous frame (limit mag = 13.5) taken 2018 Mar. 16.783 UT. There is a star (mag = 16.7) at 01s.72 and 06".9.

2018 03 22.93

The abovementioned star of 16.7 mag is USNO-A2.0 1200-18025481. There are many other designations for this star (G= 17.19 mag in Gaia DR1), e.g. USNO-B1.0 1265-0493972, GSC2.3 N359016841 (V= 17.39 mag), XPM 253-0794263, 2MASS J21290156+3631049, 1RXS J212902.0+363103. No previous outbursts or eruptions were recorded by the ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) between 2015 March and 2017 November (latest available observation 2017-11-22.247 UT): https://asas-sn.osu.edu/light_curves/3083fd37-af79-48f5-9509-6e5e1bb30b83 --- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

2018 03 23.822

Mag. 11.95 (Green plain) observed by K. Yoshimoto, Yamaguchi-ken, Japan, using 180-mm f/2.8 lens + Nikon D5100 digital camera. An image at http://orange.zero.jp/k-yoshimoto/TCP_J21290156+3631056.jpg.