Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

TCP J00425419+4130425

TCP J00425419+4130425   2017 12 25.4560*  00 42 54.19 +41 30 42.5  18.6 U  111E 874N  M31       N 0

2017 12 25.4560

Koichi Nishiyama and Fujio Kabashima report. 2017-11a did increase brightning again. in M31 on seven 60-s unfiltered CCD frames taken around 2017 Dec.25.45598 UT (limiting magnitude=20.0), using a 0.50-m f/6.8 reflector(+FLI1001E camera). as follows We report that this star locates 111" east and 874" north from the center of galaxy. Nothing is visible at this location on our past frames taken on 2017 Dec.6.499 UT(limiting magnitude=19.6). and Dec.8.457(Limiting mag=19.8) We have checked in Minor Planets. Nothing is visible at the position of possible nova on the Digitized Sky Survey (POSS2/UKSTU) from 1986 Nov.27 (limiting red mag 19.1) and 1993 Oct.21(limiting infrared mag 18.7). the nearest star in M31 catalogue (http://www.lowell.edu/users/massey/lgsurvey.html) has position end figures 54s34, 35"4, distance 7"3, magnitudes V=22.2, B=23.2, R=21.3,

2018 01 11.47110

F. Watanabe (Nayoro Observatory, Nayoro, Japan) performed a follow-up observation for this object (M31N 2017-11a = AT 2017hvi = PTSS-17zap) using a 0.4-m f/10 Meili telescope (Meade Schmidt-Cassegrain telescope) + unfiltered CCD (SBIG STL-1001E) on Jan. 11.47110 UT. The magnitude is measured to be U = 18.42 +/- 0.19 (reference stars from UCAC4 Rmag).