RA/DEC (2000)
00:42:28.425 +41:18:24.29
10.6184373 +41.3067472
Type
Nova
Redshift
0
Discovery ReportClassification Report
Reporting Group
None
Discovering Data Source
None
Discovery Date
2025-12-22 20:58:02.000
TNS AT
Y
Public
Y
Host Name
M31
Discovery Mag
18.5
Filter
Clear-
Reporter/s
Flavio Castellani
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌AT_2025ahzx - 2025-12-28 21:02:00 BL41 / FOSC-E5535 (None)z=
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   Binning factor: (rounded to nearest integer >1)
Mouse hovers at WL: 0 (rest),

Light curves

 ▌GOTO-N_GOTO-2_L
 ▌P48_ZTF-Cam_r
 ▌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
22709 2025-12-28 21:02:00 BL41 / FOSC-E5535 7200 Claudio Balcon Claudio Balcon None tns_2025ahzx_2025-12-28_21-02-00_BL41_FOSC-E5535_None.dat tns_2025ahzx_2025-12-28_21-02-00_BL41_FOSC-E5535_None.fit Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
L-GOTO GOTO-N_GOTO-2 2025-12-20 20:27:54 - 2025-12-22 19:57:27 2461030.352713 - 2461032.331564 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
542342 2025-12-22 19:57:27 2461032.331564 17.88 0.15 ABMag L-GOTO GOTO-N_GOTO-2 180
542341 2025-12-20 20:27:54 2461030.352713 18.2 ABMag L-GOTO GOTO-N_GOTO-2 180 [Last non detection]
r-ZTF P48_ZTF-Cam 2025-12-19 05:39:56 - 2025-12-29 05:18:15 2461028.7360648 - 2461038.7210069 3
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
545161 2025-12-29 05:18:15 2461038.7210069 17.5024 0.0597906 ABMag r-ZTF P48_ZTF-Cam
545160 2025-12-21 03:56:40 2461030.6643519 20.3432 0.192772 ABMag r-ZTF P48_ZTF-Cam
545159 2025-12-19 05:39:56 2461028.7360648 20.5254 ABMag r-ZTF P48_ZTF-Cam [Last non detection]
Clear- Other_Other 2025-11-20 23:54:02 - 2025-12-27 23:30:01 2461000.4958527 - 2461037.4791818 4
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
543761 2025-12-27 23:30:01 2461037.4791818 18.2 VegaMag Clear- Other_Other 60 M. Michaud The instrument is a reflector C14EdgeHD on Paramount MX+ with ZWO ASI 183 PRO MM CMOS.
541981 2025-12-22 20:58:02 2461032.3736343 18.5 0 19.4 ABMag Clear- Other_Other 2700 CASTELLANI F. Modified Dall-Kirkham telescope 0.4M F.7
541980 2025-12-20 17:53:35 2461030.245544 19.5 ABMag Clear- Other_Other 2700 CASTELLANI F. [Last non detection] Modified Dall-Kirkham telescope 0.4M F.7
543760 2025-11-20 23:54:02 2461000.4958527 19.5 VegaMag Clear- Other_Other 60 M. Michaud [Last non detection] The instrument is a reflector C14EdgeHD on Paramount MX+ with ZWO ASI 183 PRO MM CMOS.
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
283953 2025-12-30 18:26:42 Fritz Daniel Perley (LJMU),Christoffer Fremling (Caltech),Theophile du Laz (Caltech) on behalf of ZTF et al. ZTF ZTF 00:42:28.425 +41:18:24.29 2025-12-21 03:56:40.004 20.3432 r-ZTF PSN ZTF25ackztct ZTF N
282753 2025-12-28 14:33:02 Michel Michaud Michel Michaud et al. 00:42:28.410 +41:18:24.43 2025-12-27 23:30:01.310 18.2 Clear- PNV M31 MCD2025-02 N
282174 2025-12-24 12:17:17 GOTO_bot D. O'Neill,K. Ackley,M. Dyer et al. GOTO GOTO 00:42:28.401 +41:18:24.32 2025-12-22 19:57:26.784 17.88 L-GOTO Other GOTO25mmc GOTO N
281988 2025-12-22 22:55:52 Flavio Castellani Flavio Castellani et al. 00:42:28.440 +41:18:24.50 2025-12-22 20:58:02.000 18.5 Clear- Other M31 OMB-PNV29 At 0,76" from transient, a Red Supergiant Candidate with a R Magn of 20.662 is reristered on simbad database. (LGGS J004228.48+411825.6). Even if the 2 mag difference leads us to believe that the transient is not the cataloged object, an outburst cannot be excluded. 2025TNSTR5121....1C N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
22708 2025-12-31 23:59:07 Claudio Balcon Claudio Balcon (Belluno A.O. ISSP) None Nova 0 1 The low S/N spectrum resembles that of a Nova in M31. 2025TNSCR5242....1B
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
22709 2025-12-28 21:02:00 BL41 / FOSC-E5535 7200 Claudio Balcon Claudio Balcon None tns_2025ahzx_2025-12-28_21-02-00_BL41_FOSC-E5535_None.dat tns_2025ahzx_2025-12-28_21-02-00_BL41_FOSC-E5535_None.fit Object

Comments

TNS
System

Tue, 12/30/2025 - 18:26

Object coordinates updated

Object coordinates updated according to AT-report 283953 of Group ZTF
Previous RA, DEC: 00:42:28.401, +41:18:24.32 (10.618338, +41.306756)
Updated RA, DEC: 00:42:28.425, +41:18:24.29 (10.6184373, +41.3067472)

TNS
System

Wed, 12/24/2025 - 12:17

Object coordinates updated

Object coordinates updated according to AT-report 282174 of Group GOTO
Previous RA, DEC: 00:42:28.440, +41:18:24.50 (10.6185, +41.306806)
Updated RA, DEC: 00:42:28.401, +41:18:24.32 (10.618338, +41.306756)