Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

PNV J19202580+1851180

PNV J19202580+1851180   2018 01 26.8608*  19 20 25.80 +18 51 18.0  12.6 U             Sge       9 0

2018 01 26.861

Discovered by Y. Sakurai, Ibaraki-ken, Japan, on two frames with 10-s exposure using Nikon D7100 + digital camera + 180-mm f/2.8 lens under the limiting mag = 13s, who writes that nothing is visible at this location on a frame taken on 2018 Jan. 25.861 UT. There is a star (mag.= 16.2) at 26s.32 and 23".6.

2018 01 27.37

The (red) star mentioned by Sakurai-san is USNO-A2.0 1050-1366809 (V= 17.7 mag in GSC2.3). Six Gaia DR1 sources (magnitude range 17–21) are within 12" from the reported position (no known sources closer than 6"). The ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) did not record any outbursts since 2015 Feb. 8; the latest observation was obtained on 2017 October 12.28 UT: https://asas-sn.osu.edu/light_curves/0f4e26e5-6670-4e29-b33d-3c7f782dbdd9 --- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

2018 01 28.249

Nothing visible at the position given by Sakurai-san under limiting mag 13.6TG on 9x45s + 1x30s + 8x10s stacked images taken by Robert Fidrich, Budapest, Hungary with a Canon EOS 1000D DSLR camera and Zeiss Sonnar 180mm f/2.8 telephoto lens on 2018. Jan 28.249UT.

2018 01 26.854

Nothing is visible at the discovery position on three frames taken on 2018 Jan. 26.854 UT by H. Nishimura (limiting mag= 13.5), on Jan. 27.539 UT by K. Yoshimoto (limit mag.= 15.5) and Jan. 27.850 UT by T. Kojima (limit mag.= 13.2).