2019-12-29日晚，我在M31星系发现一个M31变星候选体，比较暗。经过补拍及反复比对可以确认光变真实性，怀疑是一个未知的变星，不排除是新星的可能性。
12月31日，上报TOCP:http://www.cbat.eps.harvard.edu/unconf/followups/J00425337+4114267.html
Guoyou Sun and Xing Gao, report the discovery of a variable star candidate (mag approximately 18.8R) on several 300-s surveyimages (limiting mag about 20.0) taken by Xing Gao in Xingming Observatory Sky Survey(C42) around Dec.129.63536 UT using a unfiltered CCD ( + 0.6-m f/8 Ritchey-Chretien telescope ). The transient approximately located at R.A.=00h42m53.37s +41d14’26”.7(equinox 2000.0).Which is about 102.3″ east and 101.8″ south of the center of the NGC224(M31).
NET UCAC-4
XMNGS3 C2019 12 29.63536 00 42 53.37 +41 14 26.7 18.8 R C42
XMNGS3 C2019 12 30.58778 00 42 53.39 +41 14 26.7 18.7 R C42
All images can be seen from: http://xjltp.china-vo.org/XMNGS3.html
C42,Xingming Observatory – NEXT, Mt. Nanshan. Observers G.Sun,X.Gao,Measurers G.Sun, 0.6-m f/8 Ritchey-Chretien telescope and CCD.