Discovery certificate for object 2018hho
TNS Astronomical Transient Report No. 23508 [ 2018TNSTR1576....1C ]

Date Received (UTC): 2018-10-14 00:22:22
Sender: Mr. Raffaele Belligoli
Source Group: ISSP

Flavio Castellani report/s the discovery of a new astronomical transient.

IAU Designation: AT 2018hho
Discoverer internal name: NGC224
Coordinates (J2000): RA = 00:42:40.090 (10.667042) DEC = +41:17:27.70 (41.291028)
Discovery date: 2018-10-13 19:43:40 (JD=2458405.3219907)

Potential host galaxy: M31

Remarks: F. Castellani, Verona, Italy reports the discovery by Raffaele Belligoli, Flavio Castellani and Claudio Marangoni, in the course of the ISSP Italian Supernovae Search Project, of an apparent nova in two images taken with a Moravian G4-9000 KAF CCD unfiltered, from Monte Baldo Observatory (Ferrara di Monte Baldo, Verona, Italy), with the 0.4m f.8 Ritchey-Chrétien telescope, obtained on 2018 October 13.822 and 13.845 UT. The new object is located at RA 00 42 40.12 DEC +41 17 27.3 (equinox 2000.0) Apparent magnitude about 17.5 in host Galaxy M31. Nothing is visible at this position on the reference image of 19Th september 2018. Offset '43.7W 81.3N' from the center of M31 (see link to discovery image below). Apparent magnitude 17.5 V (err +/- 0,2).

Photometry

Discovery (first detection):
Discovery date: 2018-10-13 19:43:40
Flux: 17.5 STMag
Filter: Clear-
Instrument: Other
Telescope: Other

Remarks: The nova was clearly detected on '2018-10-13.822' UT using using 6 x 300s frames (1800s total) obtained by a Moravian G4-9000 KAF unfiltered CCD with the 0.4m f.8 Ritchey-Chrétien telescope from Monte Baldo "A.Gelodi" Astronomic Observatory, località Novezzina, Ferrara di Monte Baldo, Verona, Italy. The discovery magnitude is 17.5±0.04 mag in the CV band (clear visual). We will continue to monitor the nova light curve and strongly encourage additional follow-up observations.

Last non-detection:
Last non-detection date: 2018-09-19 21:10:04
Limiting flux: 19.5 STMag
Filter: Clear-
Instrument: Other
Telescope: Other

Remarks: The last non-detected image on '2018-09-19.88' UT using 6 x 300s frames (1800s total) obtained by a Moravian G4-9000 KAF unfiltered CCD with the 0.4m f.8 Ritchey-Chrétien telescope from Monte Baldo "A.Gelodi" Astronomic Observatory, località Novezzina, Ferrara di Monte Baldo, Verona, Italy. (Latitudine 45° 41' 52" N. Longitudine 10° 51' 32" E)

Archival info: DSS
Remarks: Nothing is visible at this position on Aladin catalog.

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