Discovery certificate for object 2019vsn
TNS Astronomical Transient Report No. 53595 [ 2019TNSTR2482....1G ]

Date Received (UTC): 2019-11-29 13:26:44
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 2019vsn
Discoverer internal name: XM17MZ
Coordinates (J2000): RA = 00:41:42.380 (10.426583) DEC = +41:21:31.10 (41.358639)
Discovery date: 2019-11-17 14:42:24 (JD=2458805.1127778)

Potential host galaxy: M31

Remarks: Mi Zhang and Xing Gao, report the discovery of a variable star candidate (mag approximately 19.7) on severl 300-s survey images (limiting mag about 20.5) taken by Xing Gao in Xingming Observatory Sky Survey(C42) around Nov. 17.61278 UT using a unfiltered CCD ( + 0.6-m f/8 Ritchey-Chretien telescope ). The transient approximately located at R.A.=00h41m42.38s +41d21'31".1 (equinox 2000.0). Which is about 698.4" west and 322.6" north of the center of the NGC224(M31). Nothing is visible at this position on archival images taken on Nov. 02.64078 UT(limiting mag 20.0). NET USNO-A2.0 XM17MZ C2019 11 17.61278 00 41 42.38 +41 21 31.1 19.7R C42 XM17MZ C2019 11 28.70271 00 41 42.38 +41 21 31.1 19.5R C42

Photometry

Discovery (first detection):
Discovery date: 2019-11-17 14:42:24
Flux: 19.7 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: 2019-11-02 15:22:43
Limiting flux: 20 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://wis-tns.weizmann.ac.il/object/2019vsn