Discovery certificate for object 2018xb
TNS Astronomical Transient Report No. 17014 [ 2018TNSTR.246....1X ]

Date Received (UTC): 2018-02-19 18:52:03
Sender: Mr. Zhijian Xu
Source Group: XOSS

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

IAU Designation: AT 2018xb
Discoverer internal name: XMq9ZX
Coordinates (J2000): RA = 09:54:52.360 (148.718167) DEC = +69:04:08.50 (69.069028)
Discovery date: 2018-02-19 18:02:06 (JD=2458169.2514583)

Potential host galaxy: M81

Remarks: Zhijian Xu, Xing Gao report the discovery of a possible nova in M81. The transient is approximately Mag. 20.0 on severl 200-s survey images (limiting mag about 21.5) taken by Xing Gao in Xingming Observatory Sky Survey(C42) around Feb. 19.74683 UT using a unfiltered CCD (+ 0.6-m f/8 Ritchey-Chretien telescope). The transient approximately located at R.A.=09h54m52.36s +69d04'08".5 (equinox 2000.0). Which is about 218.9" west and 13.5" north of the center of the M81. Nothing is visible at this position on archival images taken on Feb 16.72464 (limiting mag 21.5). All images can be seen from: http://www.xjltp.com/XOSS/XMq9ZX/XMq9ZX.htm.

Photometry

Discovery (first detection):
Discovery date: 2018-02-19 18:02:06
Flux: 20 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: 2018-02-16 17:23:29
Limiting flux: 21.5 VegaMag
Filter: Clear-
Instrument: Other
Telescope: Other

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

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