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POSSIBLE NOVA IN M31 – XM43MZ

Mi Zhang and Xing Gao, report the discovery of a possible nova (mag approximately 18.7) on several 300-s survey image (limiting mag about 19.5) taken by Xing Gao at Xingming Observatory #3 (N88) around Nov. 01.57683 UTC using a unfiltered CCD (+ 0.6-m f/8 Ritchey-Chretien telescope). The transient approximately located at R.A.=00h42m46.77s +41d07’03”.1 (equinox 2000.0). Which is about 27.6″ east and 545.4″ south of the center of the NGC224(M31). Nothing is visible at this position on archival images taken on Oct. 31.53014 (limiting mag 19.0) . Images can be found at: http://xjltp.china-vo.org/xm43mz.html

Discovery image taken by N88 on Nov. 01.57683 UTC,2020 Archival image taken by N88 on Oct. 31.53014 UTC,2020 PS Image
AT 2020ypu (= XM43MZ) (= PNV J00424677+4107031)
JDHEL                   Gmag.
2459155.082        18.63
2459155.085        18.63
2459156.064        17.61
2459156.067        17.56
2459157.082        17.46
2459157.086        17.47
2459160.035        18.12
2459160.039        18.10
2459160.403        18.14
2459161.022        18.03
2459161.025        18.01
2459161.333        18.02
2459161.337        18.03
JDHEL                   Vmag.
2459156.09          17.61
2459157.104        17.38
2459157.108        17.49
2459157.112        17.43
2459157.121        17.43
2459157.125        17.47
2459159.126        18.22
2459159.13          18.28
2459161.31          18.41
2459161.322        18.35
JDHEL                   Rmag.
2459155.155        18.42
2459156.099        17.49
2459157.105        17.22
2459157.11          17.21
2459157.114        17.27
2459157.118        17.28
2459157.122        17.29
2459157.126        17.22
2459159.127        17.86
2459161.303        17.85
2459161.314        17.85
2459161.326        17.85
JDHEL                   Imag.
2459157.107        17.15
2459157.119        17.13
2459157.123        17.15
2459159.124        17.40
2459159.128        17.49
2459161.307        17.29
2459161.318        17.25
2459161.329        17.28

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