Discovery certificate for object 2018hhy
TNS Astronomical Transient Report No. 23526 [ 2018TNSTR1576....1C ]

Date Received (UTC): 2018-10-14 21:04:57
Sender: Mr. Raffaele Belligoli
Source Group: ISSP

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

IAU Designation: AT 2018hhy
Discoverer internal name: NGC 598
Coordinates (J2000): RA = 01:33:46.730 (23.444708) DEC = +30:32:18.10 (30.538361)
Discovery date: 2018-10-13 21:07:37 (JD=2458405.3802894)

Potential host galaxy: M33

Remarks: Flavio Castellani, Verona, Italy reports the discovery of an PNV by Raffaele Belligoli, Flavio Castellani, Claudio Marangoni, in the course of the ISSP Italian Supernovae Search Project. The new transient,a probable nova in M33, was detected by a Moravian G4-9000 KAF unfiltered CCD frames taken on '2018 10 13.8803' UT with the 0.4m f.8 Ritchey-Chrétien telescope. The object designated 'PNV J01334673+3032181' is located at RA= '01 33 46.73' DEC= '+30 32 18.1' (equinox 2000.0) Offset '54.19W 437.7S' from the center of M33 (see link to discovery image below). Apparent magnitude 18.1 R (err +/- 0,2).

Photometry

Discovery (first detection):
Discovery date: 2018-10-13 21:07:37
Flux: 18.1 STMag
Filter: Clear-
Instrument: Other
Telescope: Other

Remarks: The nova was clearly detected on '2018 10 13.8803' UT using using 11 x 300s frames (3300s 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 18.1±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: 2018-09-03 23:50:40
Limiting flux: 19.5 STMag
Filter: Clear-
Instrument: Other
Telescope: Other

Remarks: The last non-detected image on '2018/09/03.99353' UT using 10 x 300s frames (3000s 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: No stellar source is visible at the transient's position in our past images and ALADIN sky atlas. No variable star is present at these coordinates on the SIMBAD database.

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