Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

TCP J18165899+2538015

TCP J18165899+2538015   2021 03 19.8653*  18 16 58.99 +25 38 01.5  16.37r             Her       R 9

2021 03 19.8653

Hanjie Tan (Institute of Astronomy, National Central University), Mi Zhang, Guoyou Sun, Jingyuan Zhao (Xingming Observatory), Quanzhi Ye (Department of Astronomy, University of Maryland), Xing Gao (Xingming Observatory), report ~5.5 mag outburst in a variable star candidate (16.37 r) which is 21.91 rmag in Pan-STARRS DR1 catalogue (PS1 objID 138762742458740999). The transient was discovered on several 120-s survey images (limiting mag about 18.0) taken by Xing Gao at Xingming Observatory #3 (N88) around Mar. 19.86528, 2021 UT using a unfiltered CCD (0.3-m f/3.6 reflector). Images can be found at: http://xjltp.china-vo.org/xm62ht.html

2021 03 19.8653

Known variable star (UG) in VSX: ASASSN-21du (https://www.aavso.org/vsx/index.php?view=detail.top&oid=2217316)