POSSIBLE NOVA IN M31Hanjie Tan(Guangzhou, Guangdong, China) and Xing Gao (Urumqi, Xinjiang, China), report the discovery of a possible nova (mag approximately 17.9) on two several 60-s survey images (limiting mag about 19.0) taken by Xing Gao in Xingming Observatory Sky Survey(C42) around Feb. 18.56123 UT and Feb. 18.61992 UT using a unfilled CCD ( + Celestron C14 Schmidt- Cassegrain telescope D=356-mm @f/6.9 ). the new object approximately located at R.A.=00h42m02s.32 Decl.=+41°29’15”.3 (equinox 2000.0), which is 440.6″ west and 786.8″ north from the center of the galaxy M31. We also find the fuzzy object at the same position taken by C42 on Feb.15 and Feb.16. Nothing is visible at this position on archival images taken on Jan. 22 (limiting mag 19.5) and Feb 13 (limiting mag 19.0) or on the DSS(POSS-II N) from 1993-10-21 (limiting red mag 20.8).
All images can be seen from: http://www.xjltp.com/XOSS/XM03TH/XM03TH.htm
NET USNO-A2.0
XM03TH C2011 02 15.63233 00 42 02.38 +41 29 15.4 18.8 V C42
XM03TH C2011 02 16.54486 00 42 02.32 +41 29 15.6 18.7 V C42
XM03TH C2011 02 18.56123 00 42 02.32 +41 29 15.2 17.9 V C42
XM03TH C2011 02 18.61992 00 42 02.31 +41 29 15.3 17.6 V C42
C42 Xingming Observatory, Mt. Nanshan. Observers H.Tan, X.Gao, Measurers Z.Xu. 0.36-m f/6.9 Schmidt-Cassegrain telescope and CCD.
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Discovery image taken by C42 on Feb. 18.56123（LM=19.0,60S）
DSS IMAGE
archival images taken on Jan.22.5