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PSP项目 PSP21B = AT 2021rno = PNV J00423807+4108423 * M31河外新星(再发新星)

Mi Zhang, Xing Gao (Xingming Observatory), report the discovery of a possible nova (mag approximately 17.5 CV) on several 30-s survey image (limiting mag about 19.0) taken by Xing Gao at Xingming Observatory #2 (N89) around Jul. 02.75781 UTC using a unfiltered CCD (0.5-m f/4 reflector). The transient approximately located at R.A.=00h42m38.07s +41d08’42”.3 (equinox 2000.0). Which is about 70.5″ west and 446.2″ south of the center of the NGC224(M31). Nothing is visible at this position on archival images taken on Jun. 28.83559 (limiting mag 19.0) . Possible the recurrent nova M31 1923-12c (=2012-01b). Images can be found at: http://xjltp.china-vo.org/psp21b.html

NET UCAC-4
PSP21B C2021 07 02.75781 00 42 38.07 +41 08 42.3 17.5 V N89

Discovery image taken by N89 on Jul. 02.75781 UTC,2021 Archival image taken by N89 on Jun. 28.83559 UTC,2021 PS Image

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