Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

PNV J00425789+4118447

PNV J00425789+4118447   2017 11 20.4448*  00 42 57.89 +41 18 44.7  16.6 U  153E 156N  M31       N 0

2017 11 20.4448

Koichi Nishiyama and Fujio Kabashima report the discovery of a possible nova (mag.=16.6) in M31 on seven 60-s unfiltered CCD frames taken around 2017 Nov.20.44479 UT (limiting magnitude=19.5), using a 0.50-m f/6.8 reflector(+FLI1001E camera). as follows We report that this star locates 153" east and 156" north from the center of galaxy. Nothing is visible at this location on our past frames taken on 2017 Nov.16.510 UT(limiting magnitude=19.5). and Nov.18.562(Limiting mag=19.6) 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 18.7) and 1993 Oct.21(limiting infrared mag 17.8). the nearest star in M31 catalogue (http://www.lowell.edu/users/massey/lgsurvey.html) has position end figures 57s92, 45"3, distance 0"7, magnitudes V=22.3, B=22.9, R=21.5,

2017 11 23.50671

F. Watanabe observed this object using a 0.4-m f/10 Meili telescope (Meade Schmidt-Cassegrain telescope) + unfiltered CCD (SBIG STL-1001E) at Nayoro Observatory, Nayoro, Japan on Nov. 23.50671 UT. The magnitude is measured to be U = 17.2 +/- 0.1 (reference stars from UCAC4 Vmag) and the position end figures are given as 57s.97, 44”.6.