POSSIBLE NOVA IN M31 – XM42MZ

Mi Zhang and Xing Gao, report the discovery of a possible nova (mag approximately 18.2) on several 300-s survey image (limiting mag about 19.0) taken by Xing Gao at Xingming Observatory #3 (N88) around Oct. 31.52638 UTC using a unfiltered CCD (+ 0.6-m f/8 Ritchey-Chretien telescope). The transient approximately located at R.A.=00h42m20.16s +41d14’28”.5 (equinox 2000.0). Which is about 272.4″ west and 100″ south of the center of the NGC224(M31). Nothing is visible at this position on archival images taken on Oct. 30.55322 (limiting mag 19.0) . Images can be found at: http://xjltp.china-vo.org/xm42mz.html

NET UCAC-4
XM42MZ C2020 10 31.52638 00 42 20.16 +41 14 28.5 18.2 V N88
XM42MZ C2020 10 31.53014 00 42 20.15 +41 14 28.4 18.3 V N88

Discovery image taken by N88 on Oct. 31.52638 UTC,2020 Archival image taken by N88 on Oct. 30.55322 UTC,2020 PS Image
AT 2020yky (= XM42MZ) (= PNV J00424960+4116523)
JDHEL                   Gmag.
2459154.031        18.24
2459154.035        18.34
2459155.082        17.06
2459155.085        17.04
2459156.064        16.51
2459156.067        16.52
2459157.082        16.94
2459157.086        16.93
2459160.035        17.32
2459160.039        17.30
2459160.403        17.43
2459161.022        17.60
2459161.025        17.56
2459161.333        17.66
2459161.337        17.66
JDHEL                   Vmag.
2459155.154        16.95
2459155.158        16.87
2459156.086        16.42
2459156.09          16.50
2459156.094        16.51
2459156.098        16.46
2459156.102        16.48
2459157.104        16.90
2459157.108        16.94
2459157.112        17.01
2459157.117        17.00
2459157.121        16.97
2459157.125        16.99
2459159.126        17.28
2459159.13          17.30
2459161.31          17.86
JDHEL                   Rmag.
2459155.155        16.82
2459155.159        16.83
2459156.087        16.39
2459156.091        16.39
2459156.095        16.31
2459156.099        16.34
2459156.103        16.37
2459157.105        16.75
2459157.11          16.76
2459157.114        16.75
2459157.118        16.79
2459157.122        16.76
2459157.126        16.81
2459159.127        17.00
2459161.303        17.41
2459161.314        17.43
2459161.326        17.44
JDHEL                   Imag.
2459155.156        16.80
2459155.16          16.70
2459156.088        16.33
2459156.092        16.30
2459156.096        16.22
2459156.101        16.32
2459157.107        16.70
2459157.111        16.57
2459157.115        16.53
2459157.119        16.56
2459157.123        16.58
2459159.124        16.60
2459159.128        16.70
2459161.307        17.29
2459161.318        17.29
2459161.329        17.29

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