Discovery certificate for object 2018apj
TNS Astronomical Transient Report No. 17604

Date Received (UTC): 2018-04-02 15:18:05
Sender: Mr. Zhijian Xu
Source Group: XOSS

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

IAU Designation: AT 2018apj
Discoverer internal name: XMr4ZX
Coordinates (J2000): RA = 09:55:31.940 (148.883083) DEC = +69:09:14.70 (69.154083)
Discovery date: 2018-04-02 14:46:57 (JD=2458211.1159375)

Potential host galaxy: M81

Remarks: Zhijian Xu and Xing Gao report the discovery of a possible nova in M81. The transient is approximately Mag. 20.4 on severl 300-s survey images (limiting mag about 21.5) taken by Xing Gao in Xingming Observatory Sky Survey(C42) around Apr. 02.61594 UT using a unfiltered CCD (+ 0.6-m f/8 Ritchey-Chretien telescope). The transient approximately located at R.A.=09h55m31.94s +69d09'14".7 (equinox 2000.0). Which is about 6.6" west and 319.7" north of the center of the M81. Nothing is visible at this position on archival images taken on Mar 21.61384 (limiting mag 21.7). NET UCAC-4 XMr4ZX KC2018 04 02.61594 09 55 31.94 +69 09 14.7 20.4 V C42. All images can be seen from: http://www.xjltp.com/XOSS/XMr4ZX/XMr4ZX.htm. Xingming Observatory(C42) - NEXT, Mt. Nanshan, 0.6-m f/8 Ritchey-Chretien telescope and CCD.

Photometry

Discovery (first detection):
Discovery date: 2018-04-02 14:46:57
Flux: 20.4 VegaMag
Filter: Clear-
Instrument: Other
Telescope: Other

Remarks: 0.6-m f/8 Ritchey-Chretien telescope + unfiltered CCD.

Last non-detection:
Last non-detection date: 2018-03-21 14:43:56
Limiting flux: 21.7 VegaMag
Filter: Clear-
Instrument: Other
Telescope: Other


Details of the new object can be viewed here: https://wis-tns.weizmann.ac.il/object/2018apj