Mi Zhang, Xing Gao (Xingming Observatory), report the discovery of a possible nova (mag approximately 17.9) on several 300-s survey images (limiting mag about 20.5) taken by Xing Gao at Xingming Observatory #3 (N88) around Feb. 16.57161, 2021 UTC using a unfiltered CCD (+ 0.6-m f/8 Ritchey-Chretien telescope). The transient approximately located at R.A.=00h42m04.24s +40d42’33”.6 (equinox 2000.0). Which is about 451.9″ west and 2014.9″ south of the center of the NGC224(M31). Nothing is visible at this position on archival images taken on Feb. 12.64922, 2021 (limiting mag 19.5). Images can be found at: http://xjltp.china-vo.org/xm51mz.html
NET UCAC-4
XM51MZ C2021 02 16.57161 00 42 04.24 +40 42 33.6 17.9 CV N88
XM51MZ C2021 02 16.57537 00 42 04.24 +40 42 33.6 17.9 CV N88
XM51MZ C2021 02 17.55517 00 42 04.24 +40 42 33.6 17.1 CV N88
XM51MZ C2021 02 17.55892 00 42 04.24 +40 42 33.6 17.1 CV N88
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| Discovery image taken by N88 on Feb. 16.57161 UTC,2021 | Archival image taken by N88 on Feb. 12.64922 UTC,2021 | PS Image |