Discovery certificate for object 2018aba
TNS Astronomical Transient Report No. 17147 [ 2018TNSTR.312....1G ]

Date Received (UTC): 2018-03-07 01:37:35
Sender: Mr. Zhijian Xu
Source Group: XOSS

Mi Zhang and Xing Gao report/s the discovery of a new astronomical transient.

IAU Designation: AT 2018aba
Discoverer internal name: XM02MZ
Coordinates (J2000): RA = 09:55:36.070 (148.900292) DEC = +69:02:14.10 (69.03725)
Discovery date: 2018-03-06 15:07:18 (JD=2458184.1300694)

Potential host galaxy: M81

Remarks: Mi Zhang and Xing Gao, report the discovery of a possible nova (mag approximately 20.8) on severl 300-s survey images (limiting mag about 21.5) taken by Xing Gao in Xingming Observatory Sky Survey(C42) around Mar. 06.63007 UT using a unfiltered CCD ( + 0.6-m f/8 Ritchey-Chretien telescope ). The transient approximately located at R.A.=09h55m36.07s +69d02'14".1 (equinox 2000.0). Which is about 15.6" east and 100.9" south of the center of the M81. Nothing is visible at this position on archival images taken on Mar. 04.58642 (limiting mag 21.0). NET UCAC-4 XM02MZ C2018 03 06.63007 09 55 36.07 +69 02 14.1 20.8 V C42. All images can be seen from: http://www.xjltp.com/XOSS/XM02MZ/XM02MZ.htm C42,Xingming Observatory - NEXT, Mt. Nanshan. Observers M.Zhang,X.Gao,Measurers M.Zhang, 0.6-m f/8 Ritchey-Chretien telescope and CCD.

Photometry

Discovery (first detection):
Discovery date: 2018-03-06 15:07:18
Flux: 20.8 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: 2018-03-04 14:04:27
Limiting flux: 21 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/2018aba