Discovery certificate for object 2017fog
TNS Astronomical Transient Report No. 12677 [ 2017TNSTR.785....1X ]

Date Received (UTC): 2017-07-20 09:15:21
Sender: Mr. Zhijian Xu
Reporting Group: XOSS     Discovery Data Source: XOSS

Zhijian Xu, Xing Gao report/s the discovery of a new astronomical transient.

IAU Designation: AT 2017fog
Discoverer internal name: XMd3ZX
Coordinates (J2000): RA = 00:43:14.980 (10.812417) DEC = +41:20:49.80 (41.347167)
Discovery date: 2017-07-19 21:04:36.000 (JD=2457954.3781944)

Potential host galaxy: M31


Photometry

Discovery (first detection):
Discovery date: 2017-07-19 21:04:36.000
Flux: 18.4 VegaMag
Filter: Clear-
Instrument: Other
Telescope: Other

Remarks: Zhijian Xu(Nanjing, Jiangsu, China) and Xing Gao (Urumqi, Xinjiang, China) report the discovery of a possible nova in M31. The transient (mag approximately 18.4) on severl 40-s survey images (limiting mag about 19.0) taken by Xing Gao in Xingming Observatory Sky Survey(C42) around Jul. 19.87819 UT using a unfiltered CCD ( + Celestron C14 Schmidt-Cassegrain telescope D=356-mm @f/6.9 ). The new object approximately located at R.A.=00h43m14.98s +41d20'49".8 (equinox 2000.0). Which is about 345.7" east and 281.3" north of the center of the NGC224(M31). Nothing is visible at this position on archival images taken on Jul 16.84425 (limiting mag 19.0). All images can be seen from: http://www.xjltp.com/XOSS/XMd3ZX/XMd3ZX.htm.

Last non-detection:
Last non-detection date: 2017-07-16 20:15:43
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/2017fog