RA/DEC (2000)
00:42:46.610 +41:18:06.20
10.694208 +41.301722
Type
Nova
Redshift
Reporting Group
None
Discovering Data Source
None
Discovery Date
2025-07-31 02:50:55.680
TNS AT
Y
Public
Y
Host Name
M31
Discovery Mag
18.3
Filter
Clear-
Reporter/s
Róbert Fidrich

Spectra

 AT_2025sro - 2025-07-31 16:47:21 Other / Other (None)z=
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Light curves

 Other_Other_Clear
   
Pointer position (MJD, Mag, Abs.Mag): (0.00, 0.00, 0.00)
Spectra
ID Obs-date (UT) Tel / Inst Exp-Time Observer/s Reducer/s Group Spectrum ascii file Spectrum fits file Spec. Type Assoc. Groups End prop. period Remarks
21680 2025-07-31 16:47:21 Other / Other 900 Hiroyuki Maehara Kenta Taguchi None tns_2025sro_2025-07-31_16-47-21_Other_Other_None.dat tns_2025sro_2025-07-31_16-47-21_Other_Other_None.fits Object A spectroscopic follow-up observation with KOOLS-IFU mounted on the 3.8-m Seimei telescope at Okayama Observatory of Kyoto University. The spectral resolution is ~ 500, and the wavelength coverage is 4100-8500 A.
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
Clear- Other_Other 2025-07-27 23:07:18 - 2025-07-31 02:50:56 2460884.4634 - 2460887.6187 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
506298 2025-07-31 02:50:56 2460887.6187 18.3 0.15 19 VegaMag Clear- Other_Other 360 Robert Fidrich Róbert Fidrich and Tamás Tordai (HAA/VSS) report the discovery of a new astronomical transient. Discovered using 4x90s co-added images made with a 0.43 m Dall-Kirkham telescope at Alnitak Remote Observatory, Sierra del Segura, SpaiN, with Luminance filter. The discovery was made using the Alnitak Remote Observatories robotic telescope network, ARTA program.
506297 2025-07-27 23:07:18 2460884.4634 18.8 VegaMag Clear- Other_Other 180 Robert Fidrich [Last non detection] 2x90s co-added images made with a 0.43 m Dall-Kirkham telescope at Alnitak Remote Observatory, Sierra del Segura, SpaiN, with Luminance filter.
AT Reports
ID Time received (UT) Sender Reporter/s Reporting group Disc. Data Source RA DEC Discovery date (UT) Discovery Mag. Filter Related files AT Type Host name Internal name Assoc. Groups End prop. period Remarks ADS Bibcode Unreal Auto classification
264394 2025-07-31 04:38:50 Róbert Fidrich Róbert Fidrich 00:42:46.610 +41:18:06.20 2025-07-31 02:50:55.680 18.3 Clear- PNV M31 Róbert Fidrich and Tamás Tordai (HAA/VSS) report the discovery of a new astronomical transient. Discovered using 4x90s co-added images made with a 0.43 m Dall-Kirkham telescope at Alnitak Remote Observatory, Sierra del Segura, SpaiN, with Luminance filter. The discovery was made using the Alnitak Remote Observatories robotic telescope network, ARTA program. 2025TNSTR3006....1F N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
21680 2025-08-01 07:05:36 Kenta Taguchi Kenta Taguchi (Kyoto University), Hiroyuki Maehara (National Astronomical Observatory of Japan) None Nova 1 Since our low-resolution spectrum shows Balmer lines having P Cygni profiles, we propose that this object is a nova in M31. 2025TNSCR3032....1T
Spectra
ID Obs-date (UT) Tel / Inst Exp-Time Observer/s Reducer/s Group Spectrum ascii file Spectrum fits file Spec. Type Assoc. Groups End prop. period Remarks
21680 2025-07-31 16:47:21 Other / Other 900 Hiroyuki Maehara Kenta Taguchi None tns_2025sro_2025-07-31_16-47-21_Other_Other_None.dat tns_2025sro_2025-07-31_16-47-21_Other_Other_None.fits Object A spectroscopic follow-up observation with KOOLS-IFU mounted on the 3.8-m Seimei telescope at Okayama Observatory of Kyoto University. The spectral resolution is ~ 500, and the wavelength coverage is 4100-8500 A.

Comments

Katsumi
Yoshimoto

Photometry

2025-07-31 15:04:39
V mag =16.0, using 0.30-m f/4.0 reflector + V filter CMOS.

Róbert
Fidrich

Precize astrometry

Precize astrometry by Tamás Elek (Nyíregyháza-Oros, Hungary): 00 42 46.57 +41 18 07.5 (J2000.0)