RA/DEC (2000)
00:42:45.492 +41:15:18.19
10.6895491667 +41.2550533333
Type
Nova
Redshift
0
Discovery ReportClassification Report
Reporting Group
None
Discovering Data Source
None
Discovery Date
2025-11-03 04:35:36.960
TNS AT
Y
Public
Y
Host Name
M31
Discovery Mag
16.5
Filter
Clear-
Reporter/s
Róbert Fidrich
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌AT_2025acfl - 2025-11-06 20:29:00 BL41 / FOSC-E5535 (None)z=
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   Binning factor: (rounded to nearest integer >1)
Mouse hovers at WL: 0 (rest),

Light curves

 ▌ATLAS-TDO_ATLAS-05_wide
 ▌GOTO-N_GOTO-2_L
 ▌GOTO-N_GOTO-1_L
 ▌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
22364 2025-11-06 20:29:00 BL41 / FOSC-E5535 3600 Claudio Balcon Claudio Balcon None tns_2025acfl_2025-11-06_20-29-00_BL41_FOSC-E5535_None.dat tns_2025acfl_2025-11-06_20-29-00_BL41_FOSC-E5535_None.fit Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
wide-ATLAS ATLAS-TDO_ATLAS-05 2025-11-02 23:24:48 - 2025-11-05 22:21:52 2460982.47556 - 2460985.43185 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
529344 2025-11-05 22:21:52 2460985.43185 16.423 0.065 18.69 ABMag wide-ATLAS ATLAS-TDO_ATLAS-05 30 Robot
529343 2025-11-02 23:24:48 2460982.47556 18.88 ABMag wide-ATLAS ATLAS-TDO_ATLAS-05 30 Robot [Last non detection]
L-GOTO GOTO-N_GOTO-2 2025-11-02 23:01:36 - 2025-11-02 23:01:36 2460982.459453 - 2460982.459453 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
528652 2025-11-02 23:01:36 2460982.459453 17.14 0.08 ABMag L-GOTO GOTO-N_GOTO-2 360
L-GOTO GOTO-N_GOTO-1 2025-11-01 01:23:38 - 2025-11-01 01:23:38 2460980.558076 - 2460980.558076 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
528651 2025-11-01 01:23:38 2460980.558076 18.2 ABMag L-GOTO GOTO-N_GOTO-1 360 [Last non detection]
Clear- Other_Other 2025-11-02 05:52:13 - 2025-11-03 04:35:37 2460981.744596 - 2460982.6914 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
528586 2025-11-03 04:35:37 2460982.6914 16.5 0.15 18.5 VegaMag Clear- Other_Other 720 Robert Fidrich Róbert Fidrich (HAA/VSS) reports the discovery of a new astronomical transient. Discovered using 8x120s co-added images made with the 0.61-m f/6.5 CDK reflector, Sierra Remote Observatory at Auberry California USA More info: https://vendegcsillagkereso.blogspot.com/2025/11/vend74-bright-nova-candidate-in-m31.html
528585 2025-11-02 05:52:13 2460981.744596 18 VegaMag Clear- Other_Other 720 Robert Fidrich [Last non detection] Observations was made with a 0.51m telescope of Utah Desert Remote Observatory at Great Basin Desert, Beryl Junction, Utah, USA
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
275919 2025-11-06 09:47:18 ATLAS_Bot1 J. Tonry, L. Denneau, H. Weiland et al. ATLAS ATLAS 00:42:45.492 +41:15:18.19 2025-11-05 22:21:51.840 16.423 wide-ATLAS PSN ATLAS25nwp ATLAS N
275583 2025-11-03 15:44:43 GOTO_bot D. O'Neill, K. Ackley, M. Dyer et al. GOTO GOTO 00:42:45.505 +41:15:18.10 2025-11-02 23:01:36.480 17.14 L-GOTO PNV GOTO25jod GOTO N
275554 2025-11-03 08:53:19 Róbert Fidrich Róbert Fidrich 00:42:45.410 +41:15:19.20 2025-11-03 04:35:36.960 16.5 Clear- PNV M31 Róbert Fidrich (HAA/VSS) reports the discovery of a new astronomical transient. Discovered using 8x120s co-added images made with a 0.61-m f/6.5 CDK reflector, Sierra Remote Observatory at Auberry California USA More info: https://vendegcsillagkereso.blogspot.com/2025/11/vend74-bright-nova-candidate-in-m31.html 2025TNSTR4425....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
22363 2025-11-06 21:12:19 Claudio Balcon Claudio Balcon (Belluno A.O. ISSP) None Nova 0 1 The spectrum shows strong Balmer lines and Fe ll “forest” emissions, features compatible with a Nova in M31. 2025TNSCR4459....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
22364 2025-11-06 20:29:00 BL41 / FOSC-E5535 3600 Claudio Balcon Claudio Balcon None tns_2025acfl_2025-11-06_20-29-00_BL41_FOSC-E5535_None.dat tns_2025acfl_2025-11-06_20-29-00_BL41_FOSC-E5535_None.fit Object

Comments

TNS
System

Thu, 11/06/2025 - 09:47

Object coordinates updated

Object coordinates updated according to AT-report 275919 of Group ATLAS
Previous RA, DEC: 00:42:45.505, +41:15:18.10 (10.689604, +41.255027)
Updated RA, DEC: 00:42:45.492, +41:15:18.19 (10.6895491667, +41.2550533333)

Andrea
Reguitti

Wed, 11/05/2025 - 10:40

Follow-up observation

2025-11-05 01:11 UT, g mag = 16.09+-0.05, Asiago 0.67/0.92-m Schmidt telescope + Moravian, 2x240 sec exp image.

Róbert
Fidrich

Tue, 11/04/2025 - 10:12

Updated co-ordinates

Updated co-ordinates: 00 42 45.52   +41 15 18.8 (J20000.0).
The astrometry was provided by Tamás Elek, Nyíregyháza-Oros, Hungary using the original discovery images).

TNS
System

Mon, 11/03/2025 - 15:44

Object coordinates updated

Object coordinates updated according to AT-report 275583 of Group GOTO
Previous RA, DEC: 00:42:45.410, +41:15:19.20 (10.689208, +41.255333)
Updated RA, DEC: 00:42:45.505, +41:15:18.10 (10.689604, +41.255027)

Katsumi
Yoshimoto

Mon, 11/03/2025 - 12:27

Follow-up observation

2025-11-03 10:19:43 UT, V mag=16.1, 0.30-m f/4.0 reflector + V filter CMOS, photometry 4x60sec exp image.

AT-2025acfl_20251103.jpg