Discovery certificate for object 2019yw
TNS Astronomical Transient Report No. 29109 [ 2019TNSTR.130....1G ]

Date Received (UTC): 2019-01-23 13:35:09
Sender: Mr. Mi Zhang
Source Group: XOSS

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

IAU Designation: AT 2019yw
Discoverer internal name: XM08MZ
Coordinates (J2000): RA = 00:43:00.080 (10.750333) DEC = +41:18:34.00 (41.309444)
Discovery date: 2019-01-23 12:45:43 (JD=2458507.0317477)

Potential host galaxy: M31

Remarks: Mi Zhang and Xing Gao, report the discovery of a possible nova (mag approximately 19.5) on severl 300-s survey images (limiting mag about 20.5) taken by Xing Gao in Xingming Observatory Sky Survey(C42) around Jan. 23.53175 UT using a unfiltered CCD ( + 0.6-m f/8 Ritchey-Chretien telescope ). The transient approximately located at R.A.=00h43m00.08s +41d18'34".0 (equinox 2000.0). Which is about 177.7" east and 145.5" north of the center of the NGC224(M31). Nothing is visible at this position on archival images taken on Jan. 20.53300 UT(limiting mag 20.0). NET UCAC-4 XM08MZ C2019 01 23.53175 00 43 00.08 +41 18 34.0 19.5V C42 All images can be seen from: http://www.xjltp.com/XOSS/XM08MZ/XM08MZ.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: 2019-01-23 12:45:43
Flux: 19.5 VegaMag
Filter: Clear-
Instrument: Other
Telescope: Other

Remarks: Mi Zhang and Xing Gao, report the discovery of a possible nova (mag approximately 19.5) on severl 300-s survey images (limiting mag about 20.5) taken by Xing Gao in Xingming Observatory Sky Survey(C42) around Jan. 23.53175 UT using a unfiltered CCD ( + 0.6-m f/8 Ritchey-Chretien telescope ). The transient approximately located at R.A.=00h43m00.08s +41d18'34".0 (equinox 2000.0). Which is about 177.7" east and 145.5" north of the center of the NGC224(M31). Nothing is visible at this position on archival images taken on Jan. 20.53300 UT(limiting mag 20.0). NET UCAC-4 XM08MZ C2019 01 23.53175 00 43 00.08 +41 18 34.0 19.5V C42 All images can be seen from: http://www.xjltp.com/XOSS/XM08MZ/XM08MZ.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.

Last non-detection:
Last non-detection date: 2019-01-20 12:47:31
Limiting flux: 20 VegaMag
Filter: Clear-
Instrument: Other
Telescope: Other

Remarks: using a unfiltered CCD ( + 0.6-m f/8 Ritchey-Chretien telescope ).

Details of the new object can be viewed here: https://wis-tns.weizmann.ac.il/object/2019yw