发现时间2011年10月27日。
已经确认这是一颗新的SU UMa-Type Dwarf Nova,SU型矮新星，已有相关论文发表。
VSNET报告称这是一颗新矮新星。
OT J215818.5+241925 superhump period We have received observations of this new dwarf nova (=PNV J21581852+2419246) from Enrique de Miguel and Ian Miller. As already reported, there are clear superhumps. The mean period determined from this single-night data is 0.0675(2) d. My opinion is that people should use "PNV" only when there is reasonable possibility for a nova.
报告地址：
http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-campaign-dn/8145
http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-campaign-dn/8147
这是一颗新的大熊座SU型矮新星（A New SU UMa-Type Dwarf Nova），因为观测到了明确的Superhump现象。大约0.2等的光变，周期大约0.0675天，AAVSO也对其进行了长时间的观测（http://www.aavso.org/ql/results?auid=000-BKF-543&startjd=2455795.06944）。这将是国内爱好者发现的第一颗矮新星。
VSX:
27日晚，我在搜索超新星过程中，在飞马座发现一颗疑似银河系新星。这颗目标相当有趣，在dss中发现一个暗弱对应大概20等上下，该目标有14.5等。如果是新星这个亮度应该还会增加，至少到10等。我查了资料发现，飞马座，历史上从来没发现过新星，有趣有趣。后来才知道，原来这是颗矮新星。
POSSIBLE NOVA IN Pegasus
Guoyou Sun(Wenzhou, Zhejiang, China) and Xing Gao (Urumqi, Xinjiang, China)，report the discovery of a possible supernova (mag approximately 14.5) on several 40-s survey images (limiting mag about 19.0)taken by Xing Gao in Xingming Observatory Sky Survey(C42) around Oct 27.64362 UT using a unfiltered CCD ( + Celestron C14 Schmidt-Cassegrain telescope D=356-mm @f/6.9 ). The new object approximately located at R.A.=21h58m18s.52 Decl.=+24°19’24”.6 (equinox 2000.0). Nothing is visible at this position on archival images taken on Oct.14 (limiting mag 19) and on the DSS(POSS2/UKSTU Red) from Oct. 11,1990(limiting mag about 19.8).
NET USNO-A2.0
XM04GS
All images can be seen from:
C42 Xingming Observatory, Mt. Nanshan. Observers G.Sun,X.Gao ,Measurers G.Sun. 0.356-m f/6.9 Schmidt-Cassegrain telescope and CCD.
