Discovery certificate for object 2020B
TNS Astronomical Transient Report No. 57423 [ 2020TNSTR...9....1G ]

Date Received (UTC): 2020-01-01 14:23:43
Sender: Mr. Mi Zhang
Reporting Group: XOSS     Discovery Data Source: XOSS

Mi Zhang and Xing Gao report/s the discovery of a new astronomical transient.

IAU Designation: AT 2020B
Discoverer internal name: XM22MZ
Coordinates (J2000): RA = 00:41:48.990 (10.454125) DEC = +41:05:22.60 (41.089611)
Discovery date: 2020-01-01 12:33:17.000 (JD=2458850.0231134)

Potential host galaxy: M31

Remarks: 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.

Photometry

Discovery (first detection):
Discovery date: 2020-01-01 12:33:17.000
Flux: 19.8 VegaMag
Filter: Clear-
Instrument: Other
Telescope: Other

Remarks: using a unfiltered CCD ( + 0.6-m f/8 Ritchey-Chretien telescope ).

Last non-detection:
Last non-detection date: 2019-12-30 14:04:18
Limiting flux: 20.5 VegaMag
Filter: Clear-
Instrument: Other
Telescope: Other

Remarks: using a unfiltered CCD ( + 0.6-m f/8 Ritchey-Chretien telescope ).

Details of the new object can be viewed here: https://www.wis-tns.org/object/2020B