POSSIBLE NOVA IN M31
Jiangao Ruan,Yanxi Li,Guoyou Sun and Xing Gao，report the discovery of a possible nova (mag approximately 17.7) on several 40-s survey images (limiting mag about 19.5) taken by Xing Gao in Xingming Observatory Sky Survey(C42) around Oct. 30.599 UT using a unfilled CCD ( + Celestron C14 Schmidt-Cassegrain telescope D=356-mm @f/6.9 ). the new object approximately located at R.A.=00h42m50s.2 Decl.=+41°15’27”.2 (equinox 2000.0). Which is about 66″.3 east and 41″.3 north of center of the NGC224.Nothing is visible at this position on archival images taken on Oct 28.75 (limiting mag 19.0) or on the DSS(POSS-II Red) from 1997 Apr.08 (limiting red mag 20.8).
All images can be seen from: http://www.xjltp.com/XOSS/PSP17F/PSP17F.htm
C42 Xingming Observatory, Mt. Nanshan. Observers J.Ruan,Y.Li,G.Sun,X.Gao ,Measurers G.Sun. 0.356-m f/6.9 Schmidt-Cassegrain telescope and CCD.
Discovery image taken by C42 on Oct.30.5986 UT,2017
PS1 IMAGE g band
Archival images taken by C42 on Oct.28 UT,2017