2010年10月13日晚，广西天文爱好者阮建高，参与XOSS(星明天文台巡天项目Xingming Observatory Sky Survey)的超新星搜索计划时，在仙女座大星系(M31)中发现一个可疑目标，后又在13日黎明前拍摄的同天区找到暗弱对应点，排除移动目标的可能。经过XOSS搜索QQ群内多位同好协助，测量精确坐标，星等，排查可能目标，草拟上报文本，制作网页动画，补拍验证，等等，在一个小时内将该目标上报国际天文联合会专家及CBAT,详细报告及发现验证图片见
http://www.xjltp.com/XOSS/XM10AG/XM10AG.htm
经过多日等待，16日晚，CBAT发布第2500号公报，宣布该目标为仙女座星系本年度10月第三颗新星，编号M31N 2010-10c， 通报如下：
APPARENT NOVA IN M31: M31N 2010-10c
Jiangao Ruan, Fangchenggang, Guangxi, China; and Xing Gao, Urumqi,
Xinjiang, China, report the discovery of a possible nova (mag approximately
17.8) on several 60-s unfiltered CCD survey images (limiting mag about 19.0)
taken by Xing Gao in the course of the Xingming Observatory Sky Survey around
Oct. 13.5566 UT using a Celestron C14 Schmidt-Cassegrain telescope at Mt.
Nanshan. The new object, designated M31N 2010-10c, is located at R.A. =
0h44m26s.6, Decl. = +41d31’13”.4 (equinox 2000.0). Koichi Nishiyama, Kurume,
Japan; and Fujio Kabashima, Miyaki, Japan, report their independent discovery
of M31N 2010-10c at mag 17.0 on nine 40-s unfiltered CCD frames (limiting
magnitude 19.9) taken around Oct. 15.574 UT using a Meade 200R 0.40-m f/9.8
reflector (+ SBIG STL1001E camera), providing position end figures 26s.55,
13″.8 (offset 1153″ east and 905″ north from the center of the galaxy M31).
Nishiyama and Kabashima note that a star in the HST/ACS VI data of M31
globular clusters has position end figures 26s.56, 13.”8 and magnitudes V =
26.102, I = 24.499. Another independent discovery of M31N 2010-10c was made
by Koichi Itagaki (Teppo-cho, Yamagata, Japan; forwarded by S. Nakano,
Sumoto), who reported it at mag 17.4 on unfiltered CCD frames (limiting mag
19.5) taken on Oct. 16.399 using a 0.60-m f/5.7 reflector, providing position
end figures 26s.56, 13″.8; he has posted an image of the new object at the
following website URL: http://www.k-itagaki.jp/images/31-pn-16.jpg.
T. Yusa, Osaki, Japan, writes that (following a request from Kabashima and
Nishiyama), he found M31N 2010-10c at mag 17.5 on Oct. 16.396 on an
unfiltered CCD exposure (limiting mag 19.0) taken with a 0.30-m f/7
Cassegrain telescope (+ SBIG STL-1001E camera), yielding position end figures
26s.54, 13″.2. Yusa has posted an image of M31N 2010-10c at website URL
http://space.geocities.jp/yusastar77/PNinM31_101016.htm. Additional
magnitudes for M31N 2010-10c, unfiltered unless otherwise noted: 1986 Nov.
27, [20.8 (Digitized Sky Survey, red image; via Ruan and Gao); 1986 Nov. 27,
[18.4 (DSS, red image; via Nishiyama and Kabashima); 1993 Oct. 21, 18.1 (DSS,
infrared image; via Nishiyama and Kabashima); 2010 Sept. 25.576, [19.5
(Itagaki); Oct. 9.600, [19.7 (Nishiyama and Kabashima); 10.635, [19.9
(Nishiyama and Kabashima); 11.555, [19.0 (Ruan and Gao); 12.6254, [19.0 (Ruan
and Gao); 13.515, [20.5 (Itagaki); 13.596, 17.5 (Ruan and Gao); 14.583, V =
17.0 (Ruan and Gao); 16.626, 17.6 (Nishiyama and Kabashima).
至此尘埃落定，阮建高发现了我国历史上第一颗银河系外新星，这也是星明天文台发现的第二颗新星，去年5月浙江孙国佑同好曾发现一颗银河系内新星，也是得到IAU确认的作为第一发现者的我国第一颗新星发现。