Discovery certificate for object 2020enm
TNS Astronomical Transient Report No. 64550 [ 2020TNSTR.816....1G ]

Date Received (UTC): 2020-03-17 03:33:56
Sender: Mr. Mi Zhang
Reporting Group: XOSS     Discovery Data Source: XOSS

Guoyou Sun and Xing Gao report/s the discovery of a new astronomical transient.

IAU Designation: SN 2020enm
Discoverer internal name: XMPGS1
Coordinates (J2000): RA = 16:35:06.760 (248.778167) DEC = +46:12:53.80 (46.214944)
Discovery date: 2020-03-16 21:55:17.000 (JD=2458925.4133912)

Potential host galaxy: IC 1222

Remarks: Guoyou Sun and Xing Gao, report the discovery of a possible supernova (mag approximately 17.7) on several 40-s survey images (limiting mag about 19.0) taken by Xing Gao in Xingming Observatory Sky Survey(C42) around Mar. 16.91339 UT using a unfiltered CCD ( + Celestron C14 Schmidt-Cassegrain telescope D=356-mm @f/6.9 ). The transient approximately located at R.A.=16h35m06.76s +46d12'53".8 (equinox 2000.0). Which is about 25.2" west and 3.7" north of the center of the IC1222. Nothing is visible at this position on archival images taken on Sep. 20.63730 UT, 2019(limiting mag 19.0). NET UCAC-4 XMPGS1 C2020 03 16.91339 16 35 06.76 +46 12 53.8 17.7 V C42. All images can be seen from: http://xjltp.china-vo.org/XMPGS1.html. C42, Xingming Observatory, Mt. Nanshan. Observers Guoyou Sun and Xing Gao Measurer G.Sun 0.36-m f/6.9 Schmidt-Cassegrain telescope and CCD.

Photometry

Discovery (first detection):
Discovery date: 2020-03-16 21:55:17.000
Flux: 17.7 VegaMag
Filter: Clear-
Instrument: Other
Telescope: Other

Remarks: Guoyou Sun and Xing Gao, report the discovery of a possible supernova (mag approximately 17.7) on several 40-s survey images (limiting mag about 19.0) taken by Xing Gao in Xingming Observatory Sky Survey(C42) around Mar. 16.91339 UT using a unfiltered CCD ( + Celestron C14 Schmidt-Cassegrain telescope D=356-mm @f/6.9 ). The transient approximately located at R.A.=16h35m06.76s +46d12'53".8 (equinox 2000.0). Which is about 25.2" west and 3.7" north of the center of the IC1222. Nothing is visible at this position on archival images taken on Sep. 20.63730 UT, 2019(limiting mag 19.0). NET UCAC-4 XMPGS1 C2020 03 16.91339 16 35 06.76 +46 12 53.8 17.7 V C42. All images can be seen from: http://xjltp.china-vo.org/XMPGS1.html. C42, Xingming Observatory, Mt. Nanshan. Observers Guoyou Sun and Xing Gao Measurer G.Sun 0.36-m f/6.9 Schmidt-Cassegrain telescope and CCD.

Last non-detection:
Last non-detection date: 2019-09-20 15:17:43
Limiting flux: 19 VegaMag
Filter: Clear-
Instrument: Other
Telescope: Other

Remarks: using a unfiltered CCD ( + Celestron C14 Schmidt-Cassegrain telescope D=356-mm @f/6.9 ).

Details of the new object can be viewed here: https://wis-tns.weizmann.ac.il/object/2020enm