RA/DEC (2000)
05:07:52.542 -61:11:36.99
76.968925 -61.193607
Type
SN II
Redshift
0.01922
Discovery ReportClassification Report
Related AstroNotes: 2026-228
Reporting Group
ATLAS
Discovering Data Source
ATLAS
Discovery Date
2026-07-16 03:31:15.744
TNS AT
Y
Public
Y
Discovery Mag
18.045
Filter
orange-ATLAS
Reporter/s
J. Tonry, L. Denneau, H. Weiland (IfA, University of Hawaii), N. Erasmus, W. Koorts (South African Astronomical Observatory), A. Jordan, V. Suc (UAI, Obstech), M. R. Alarcón, J. Licandro, P. Nichita (IAC), S. J. Smartt, K. W. Smith (Oxford/QUB), D. R. Young, M. Nicholl, J. Weston, X. Sheng, C. R. Angus, D. Magill, A. J. Smith, L. Shingles (QUB), A. Aamer (Arizona), P. Ramsden (Birmingham/QUB), S. Srivastav, J. H. Gillanders, H. Stevance, A. J. Cooper, F. Stoppa, J. Tweddle, L. Eastman (Oxford), L. Rhodes (TSI/McGill), T. Moore, A. Rest (STScI), T.-W. Chen (NCU), C. Deasy-Millar (TCD), C. Stubbs (Harvard), J. S. Sommer (LMU), B. P. Schmidt (ANU)
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌SN_2026ved - 2026-07-28 19:12:00 ANU-2.3m / WiFeS (Supernova Alliance)z=
 ▌SN_2026ved - 2026-07-25 01:08:58 Lesedi / Mookodi (BlackGEM)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),0 (observed)

Light curves

 ▌ATLAS-STH_ATLAS-03_orange
   
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
24402 2026-07-28 19:12:00 ANU-2.3m / WiFeS 900 B. P. Schmidt C. Lidman Supernova Alliance tns_2026ved_2026-07-28.8_ANU-2.3m_WiFeS_Supernova_Alliance.dat tns_2026ved_2026-07-28.8_ANU-2.3m_WiFeS_Supernova_Alliance.fits Object
24391 2026-07-25 01:08:58 Lesedi / Mookodi 1800 Lutho Booi BlackGEM tns_2026ved_2026-07-25_01-08-58_Lesedi_Mookodi_BlackGEM_0.txt Object The spectrum shows broad Balmer emission lines, including Hα and Hβ, superimposed on a blue continuum. Cross-correlation with SNID-Sage yields a best match with early-time spectra of the Type IIb supernova SN 2011fu near peak light. The overall spectral shape and profile matches are consistent with a young Type IIb supernova near maximum light. We therefore classify AT2026ved as a Type IIb supernova.
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
orange-ATLAS ATLAS-STH_ATLAS-03 2026-07-14 04:23:20 - 2026-07-16 03:31:16 2461235.68287 - 2461237.64671 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
605430 2026-07-16 03:31:16 2461237.64671 18.045 0.08 19.35 ABMag orange-ATLAS ATLAS-STH_ATLAS-03 30 Robot
605429 2026-07-14 04:23:20 2461235.68287 19.42 ABMag orange-ATLAS ATLAS-STH_ATLAS-03 30 Robot [Last non detection]
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
315930 2026-07-20 12:16:50 ATLAS_Bot1 J. Tonry, L. Denneau, H. Weiland (IfA, University of Hawaii) et al. ATLAS ATLAS 05:07:52.542 -61:11:36.99 2026-07-16 03:31:15.744 18.045 orange-ATLAS PSN ATLAS26iur ATLAS 2026TNSTR2979....1T N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
24395 2026-07-30 05:41:12 Chris Lidman C. Lidman (ANU), B. P. Schmidt (ANU), K. Auchettl (University of Melbourne/UCSC), D. Cao (ANU), B. Martin (ANU), A. Moller (Swinburne), A. Protheroe (ANU), L. Rauf (ANU), and B. E. Tucker (ANU) Supernova Alliance SN II 0.01922 1 Supernova Alliance Classified with superfit 2026TNSCR3100....1L
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
24402 2026-07-28 19:12:00 ANU-2.3m / WiFeS 900 B. P. Schmidt C. Lidman Supernova Alliance tns_2026ved_2026-07-28.8_ANU-2.3m_WiFeS_Supernova_Alliance.dat tns_2026ved_2026-07-28.8_ANU-2.3m_WiFeS_Supernova_Alliance.fits Object
24384 2026-07-26 10:41:11 Lutho Booi Lutho Booi (UCT/SAAO), Moses Mlangeni (UCT/SAAO), Paul Groot (Radboud/UCT/SAAO), Victor Moloi (UCT/SAAO) BlackGEM SN IIb 0.01859 1 BlackGEM We obtained an optical spectrum of AT2026ved on 2026-07-25T 01:08:58 UTC using the Lesedi 1.0-m telescope at the South African Astronomical Observatory (SAAO) equipped with the Mookodi spectrograph. The data was reduced with Mookodi spectroscopic pipeline, and the resulting spectrum was analysed with SNID-Sage to extract a redshift of z = 0.01859, which is consistent with redshift measurements of the host galaxy ESO 119-G037.
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
24391 2026-07-25 01:08:58 Lesedi / Mookodi 1800 Lutho Booi BlackGEM tns_2026ved_2026-07-25_01-08-58_Lesedi_Mookodi_BlackGEM_0.txt Object The spectrum shows broad Balmer emission lines, including Hα and Hβ, superimposed on a blue continuum. Cross-correlation with SNID-Sage yields a best match with early-time spectra of the Type IIb supernova SN 2011fu near peak light. The overall spectral shape and profile matches are consistent with a young Type IIb supernova near maximum light. We therefore classify AT2026ved as a Type IIb supernova.

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