RA/DEC (2000)
00:42:50.387 +41:18:57.22
10.709944010333 +41.315893646374
Type
Nova
Redshift
0
Discovery ReportClassification Report
Related AstroNotes: 2026-281
Reporting Group
None
Discovering Data Source
None
Discovery Date
2026-09-04 03:37:43.680
TNS AT
Y
Public
Y
Host Name
M31
Comments
[Object cross-matched with NGC0224, M31]
Discovery Mag
18.2
Filter
Clear-
Reporter/s
Róbert Fidrich
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌AT_2026aaom - 2026-09-12 04:15:53 LT / SPRAT (None)z=
 ▌AT_2026aaom - 2026-09-11 21:55:00 BL41 / FOSC-E5535 (None)z=
▌Show H at z=vexp= km/s
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▌Show [Ca II] at z=vexp= km/s
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z-step:   v-step: 
   Binning factor: (rounded to nearest integer >1)
Mouse hovers at WL: 0 (rest),

Light curves

 ▌GOTO-N_GOTO-2_L
 ▌LT_IO-O_r
 ▌P48_ZTF-Cam_r
 ▌P48_ZTF-Cam_g
 ▌ATLAS-MLO_ATLAS-01_orange
 ▌PS1_GPC1_i
 ▌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
24701 2026-09-12 04:15:53 LT / SPRAT 1000 Jiashuo Zhang Jingyuan Zhao, Jiashuo Zhang, Yaozhang Ou, Ezhar Elijan None tns_2026aaom_2026-09-12_04-15-53.377_LT_SPRAT_None.DAT tns_2026aaom_2026-09-12_04-15-53.377_LT_SPRAT_None.fit Object As part of the PATAG proposal AL26A01, we obtained a spectrum of this transient using the SPRAT spectrograph (R∼350; Piascik et al. 2014) on the 2-m Liverpool Telescope (Steele et al. 2004).
24698 2026-09-11 21:55:00 BL41 / FOSC-E5535 1800 Claudio Balcon Claudio Balcon None tns_2026aaom_2026-09-11_21-55-00_BL41_FOSC-E5535_None.dat tns_2026aaom_2026-09-11_21-55-00_BL41_FOSC-E5535_None.fit Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
L-GOTO GOTO-N_GOTO-2 2026-07-17 05:12:57 - 2026-09-09 00:39:36 2461238.717327 - 2461292.527498 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
617899 2026-09-09 00:39:36 2461292.527498 15.87 0.02 ABMag L-GOTO GOTO-N_GOTO-2 180
617898 2026-07-17 05:12:57 2461238.717327 18.5 ABMag L-GOTO GOTO-N_GOTO-2 180 [Last non detection]
r-Sloan LT_IO-O 2026-09-12 05:30:20 - 2026-09-12 05:31:23 2461295.7294005 - 2461295.7301278 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
618265 2026-09-12 05:31:23 2461295.7301278 15.84 0.06 ABMag r-Sloan LT_IO-O 45 Jiashuo Zhang
618264 2026-09-12 05:30:20 2461295.7294005 15.83 0.06 ABMag r-Sloan LT_IO-O 45 Jiashuo Zhang
r-ZTF P48_ZTF-Cam 2026-09-05 10:55:18 - 2026-09-05 10:55:18 2461288.9550694 - 2461288.9550694 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
616732 2026-09-05 10:55:18 2461288.9550694 17.322 0.036317 ABMag r-ZTF P48_ZTF-Cam
g-ZTF P48_ZTF-Cam 2026-09-05 09:26:29 - 2026-09-05 09:26:29 2461288.8933912 - 2461288.8933912 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
616731 2026-09-05 09:26:29 2461288.8933912 20.5499 ABMag g-ZTF P48_ZTF-Cam [Last non detection]
orange-ATLAS ATLAS-MLO_ATLAS-01 2026-09-04 11:39:40 - 2026-09-05 11:42:37 2461287.98588 - 2461288.98793 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
616773 2026-09-05 11:42:37 2461288.98793 17.282 0.122 19.48 ABMag orange-ATLAS ATLAS-MLO_ATLAS-01 30 Robot
616772 2026-09-04 11:39:40 2461287.98588 19.37 ABMag orange-ATLAS ATLAS-MLO_ATLAS-01 30 Robot [Last non detection]
i-P1 PS1_GPC1 2026-09-12 10:55:21 - 2026-09-12 10:55:21 2461295.9551 - 2461295.9551 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
619353 2026-09-12 10:55:21 2461295.9551 15.65 0.01 20.7 ABMag i-P1 PS1_GPC1 30 Robot
Clear- Other_Other 2026-09-02 20:20:04 - 2026-09-04 03:37:44 2461286.3472663 - 2461287.6511968 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
616473 2026-09-04 03:37:44 2461287.6511968 18.2 0.15 19.5 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. This possible nova has also been designated as AT 2026zdb. Discovery images and more details: https://vendegcsillagkereso.blogspot.com/2026/09/vend91-quite-bright-possible-nova-in-m31.html The discovery was made using the Alnitak Remote Observatories robotic telescope network, ARTA program.
616472 2026-09-02 20:20:04 2461286.3472663 19 VegaMag Clear- Other_Other 4800 Robert Fidrich [Last non detection] Based on photos made by Tamás Tordai, Budapest, Hungary, 0.3m Newtonian reflector
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
323755 2026-09-15 15:26:53 PS1_Bot1 K. C. Chambers, T. de Boer, J. Fairlamb et al. Pan-STARRS Pan-STARRS 00:42:50.387 +41:18:57.22 2026-09-12 10:55:20.640 15.65 i-P1 PSN PS26hpt Pan-STARRS N
323232 2026-09-12 08:48:23 jiashuo Zhang Jiashuo Zhang STSP STSP 00:42:50.372 +41:18:57.34 2026-09-12 05:30:20.201 15.83 r-Sloan PNV M31 STSP We report follow-up Sloan-r photometry of AT 2026aaom obtained with the IO camera on the 2-m Liverpool Telescope. Two 45-s exposures obtained on 2026-09-12 give r = 15.83 +/- 0.06 mag at 05:30:20 UT and r = 15.84 +/- 0.06 mag at 05:31:23 UT (AB system). Photometric calibration was performed against Pan-STARRS1 DR2 field stars. The transient is located on the structured background of M31. N
323036 2026-09-10 19:11:38 GOTO_bot G. Ramsay, D. O'Neill, K. Ackley et al. GOTO GOTO 00:42:50.376 +41:18:57.26 2026-09-09 00:39:36.000 15.87 L-GOTO Other GOTO26jfr GOTO N
322438 2026-09-05 18:02:02 ATLAS_Bot1 J. Tonry, L. Denneau, H. Weiland (IfA, University of Hawaii) et al. ATLAS ATLAS 00:42:50.387 +41:18:57.29 2026-09-05 11:42:37.152 17.282 orange-ATLAS PSN ATLAS26kuh ATLAS N
322422 2026-09-05 14:51:09 ZTFReST_bot Aditya Pawan Saikia (Indian Institute of Technology Bombay) on behalf of ZTF ZTF ZTF 00:42:50.372 +41:18:57.34 2026-09-05 10:55:17.996 17.322 r-ZTF PSN ZTF26abseonx ZTF N
322297 2026-09-04 13:45:00 Róbert Fidrich Róbert Fidrich 00:42:50.381 +41:18:58.76 2026-09-04 03:37:43.680 18.2 Clear- PNV M31 Vend91 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. Discovery images and more details: https://vendegcsillagkereso.blogspot.com/2026/09/vend91-quite-bright-possible-nova-in-m31.html The discovery was made using the Alnitak Remote Observatories robotic telescope network, ARTA program. 2026TNSTR3573....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
24693 2026-09-12 08:18:05 jiashuo Zhang Jingyuan Zhao, Jiashuo Zhang, Yaozhang Ou, Ezhar Elijan None Nova 1 Our spectrum shows prominent Balmer emission lines (Hα, Hβ, Hγ, and Hδ), as well as numerous Fe II emission lines. We measured the FWHM of Hα to be approximately 1800 km/s. Therefore, we classify AT 2026aaom as a Fe II-type nova. The overall spectral features are consistent with the result reported by Claudio Balcon. 2026TNSCR3698....1Z
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
24701 2026-09-12 04:15:53 LT / SPRAT 1000 Jiashuo Zhang Jingyuan Zhao, Jiashuo Zhang, Yaozhang Ou, Ezhar Elijan None tns_2026aaom_2026-09-12_04-15-53.377_LT_SPRAT_None.DAT tns_2026aaom_2026-09-12_04-15-53.377_LT_SPRAT_None.fit Object As part of the PATAG proposal AL26A01, we obtained a spectrum of this transient using the SPRAT spectrograph (R∼350; Piascik et al. 2014) on the 2-m Liverpool Telescope (Steele et al. 2004).
24690 2026-09-11 22:19:44 Claudio Balcon Claudio Balcon (Belluno A.O. ISSP) None Nova 0 1 The spectrum shows strong Balmer lines and Fell “forest” emissions, features compatible with a Nova in M31 2026TNSCR3675....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
24698 2026-09-11 21:55:00 BL41 / FOSC-E5535 1800 Claudio Balcon Claudio Balcon None tns_2026aaom_2026-09-11_21-55-00_BL41_FOSC-E5535_None.dat tns_2026aaom_2026-09-11_21-55-00_BL41_FOSC-E5535_None.fit Object

Comments

TNS
System

Fri, 09/18/2026 - 12:51

Object coordinates updated

Object coordinates updated according to AT-report 323755 of Group Pan-STARRS
Previous RA, DEC: 00:42:50.387, +41:18:57.22 (10.709944010333, +41.315893646374)
Updated RA, DEC: 00:42:50.387, +41:18:57.22 (10.709944010333, +41.315893646374)

TNS
System

Tue, 09/15/2026 - 15:26

Object coordinates updated

Object coordinates updated according to AT-report 323755 of Group Pan-STARRS
Previous RA, DEC: 00:42:50.372, +41:18:57.34 (10.7098845, +41.3159264)
Updated RA, DEC: 00:42:50.387, +41:18:57.22 (10.709944010333, +41.315893646374)

TNS
System

Sat, 09/05/2026 - 14:51

Object coordinates updated

Object coordinates updated according to AT-report 322422 of Group ZTF
Previous RA, DEC: 00:42:50.381, +41:18:58.76 (10.709922, +41.316323)
Updated RA, DEC: 00:42:50.372, +41:18:57.34 (10.7098845, +41.3159264)