张宓 XM22MZ = AT 2020B ? M31河外新星

POSSIBLE NOVA IN M31-XM22MZ

Mi Zhang and Xing Gao, report the discovery of a possible nova (mag approximately 19.8) on several 300-s survey images (limiting mag about 21.0) taken by Xing Gao in Xingming Observatory Sky Survey(C42) around Jan. 01.52311 UT using a unfiltered CCD ( + 0.6-m f/8 Ritchey-Chretien telescope ). The transient approximately located at R.A.=00h41m48.99s +41d05’22”.6 (equinox 2000.0). Which is about 623.8″ west and 645.9″ south of the center of the NGC224(M31). Nothing is visible at this position on archival images taken on Dec. 30.58632 UT(limiting mag 20.5).

NET Gaia DR2
XM22MZ C2020 01 01.52311 00 41 48.99 +41 05 22.6 19.8R C42

All images can be seen from: http://xjltp.china-vo.org/XM22MZ.html
C42,Xingming Observatory – NEXT, Mt. Nanshan. Observers M.Zhang,X.Gao,Measurers M.Zhang, 0.6-m f/8 Ritchey-Chretien telescope and CCD.

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