Discovery certificate for object 2018ya
TNS Astronomical Transient Report No. 17046 [ 2018TNSTR.258....1Z ]

Date Received (UTC): 2018-02-22 15:17:57
Sender: Mr. Zhijian Xu
Source Group: XOSS

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

IAU Designation: AT 2018ya
Discoverer internal name: XM01MZ
Coordinates (J2000): RA = 00:41:50.590 (10.460792) DEC = +41:25:49.90 (41.430528)
Discovery date: 2018-02-22 14:17:22 (JD=2458172.0953935)

Potential host galaxy: M31

Remarks: Mi Zhang and Xing Gao, report the discovery of a possible nova (mag approximately 17.9) on severl 200-s survey images (limiting mag about 20.5) taken by Xing Gao in Xingming Observatory Sky Survey(C42) around Feb. 22.5954 UT using a unfiltered CCD ( + 0.6-m f/8 Ritchey-Chretien telescope ). The transient approximately located at R.A.=00h41m50.59s +41d25'49".9 (equinox 2000.0). Which is about 605.8" west and 581.4" north of the center of the NGC224(M31).Nothing is visible at this position on archival images taken on Feb 14.58587 UT(limiting mag 21.5). NET UCAC-4 XM01MZ C2018 02 22.59539 00 41 50.59 +41 25 49.9 17.9 V C42 All images can be seen from: http://www.xjltp.com/XOSS/XM01MZ/XM01MZ.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: 2018-02-22 14:17:22
Flux: 17.9 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: 2018-02-14 14:03:39
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/2018ya