RA/DEC (2000)
20:30:20.180 -54:23:56.77
307.584084 -54.399104
Type
SN Ia
Redshift
0.055
Discovery ReportClassification Report
Related AstroNotes: 2026-145
Reporting Group
ATLAS
Discovering Data Source
ATLAS
Discovery Date
2026-05-13 06:25:42.240
TNS AT
Y
Public
Y
Discovery Mag
18.409
Filter
cyan-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, M. Fulton, M. McCollum, T. Moore, J. Weston, X. Sheng, C. R. Angus, A. Wilson, A. Aamer, D. Magill, P. J. Broda, A. J. Smith (QUB), P. Ramsden (Birmingham/QUB), L. Shingles (GSI/QUB), S. Srivastav, J. H. Gillanders, H. Stevance, A. J. Cooper, F. Stoppa, J. Tweddle, L. Eastman (Oxford), L. Rhodes (TSI/McGill), A. Rest (STScI), T.-W. Chen (NCU), C. Stubbs (Harvard), J. S. Sommer (LMU), B. P. Schmidt (ANU)
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌SN_2026mld - 2026-05-20 07:00:07 ESO-NTT / EFOSC2-NTT (ePESSTO+)z=
▌Show H at z=vexp= km/s
▌Show He at z=vexp= km/s
▌Show He II at z=vexp= km/s
▌Show C II at z=vexp= km/s
▌Show C III at z=vexp= km/s
▌Show C IV at z=vexp= km/s
▌Show N II at z=vexp= km/s
▌Show N III at z=vexp= km/s
▌Show N IV at z=vexp= km/s
▌Show N V at z=vexp= km/s
▌Show O at z=vexp= km/s
▌Show [O I] at z=vexp= km/s
▌Show O II at z=vexp= km/s
▌Show [O II] at z=vexp= km/s
▌Show [O III] at z=vexp= km/s
▌Show O V at z=vexp= km/s
▌Show O VI at z=vexp= km/s
▌Show Na at z=vexp= km/s
▌Show Mg at z=vexp= km/s
▌Show Mg II at z=vexp= km/s
▌Show Si II at z=vexp= km/s
▌Show S II at z=vexp= km/s
▌Show Ca II at z=vexp= km/s
▌Show [Ca II] at z=vexp= km/s
▌Show Fe II at z=vexp= km/s
▌Show Fe III at z=vexp= km/s
▌Show Å at z=vexp= km/s
▌Show Å at z=vexp= km/s
▌Show Å at z=vexp= km/s
▌Show Å at z=vexp= km/s
▌Show Tellurics 
▌Show Galaxy lines at z=
▌Show WR-WN at z=vexp= km/s
▌Show WR-WC/O at z=vexp= km/s
   Binning factor: (rounded to nearest integer >1)
Mouse hovers at WL: 0 (rest),0 (observed)

Light curves

 ▌GOTO-S_GOTO-4_L
 ▌ATLAS-CHL_ATLAS-04_orange
 ▌ATLAS-CHL_ATLAS-04_cyan
   
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
23787 2026-05-20 07:00:07 ESO-NTT / EFOSC2-NTT 900 Jasvinderjit Khaulsay, Jonathan Quirola Meng-Han Lee, Anirban Dutta, Aiswarya Sankar.K ePESSTO+ tns_2026mld_2026-05-20_07-00-07_ESO-NTT_EFOSC2-NTT_ePESSTO+.asci tns_2026mld_2026-05-20_07-00-07_ESO-NTT_EFOSC2-NTT_ePESSTO+.fits Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
L-GOTO GOTO-S_GOTO-4 2026-04-11 19:18:10 - 2026-05-05 17:32:56 2461142.304277 - 2461166.231202 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
587750 2026-05-05 17:32:56 2461166.231202 19.38 0.16 ABMag L-GOTO GOTO-S_GOTO-4 180
587749 2026-04-11 19:18:10 2461142.304277 19.3 ABMag L-GOTO GOTO-S_GOTO-4 180 [Last non detection]
orange-ATLAS ATLAS-CHL_ATLAS-04 2026-05-04 07:25:26 - 2026-05-04 07:25:26 2461164.80933 - 2461164.80933 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
582310 2026-05-04 07:25:26 2461164.80933 18.8 ABMag orange-ATLAS ATLAS-CHL_ATLAS-04 30 Robot [Last non detection]
cyan-ATLAS ATLAS-CHL_ATLAS-04 2026-05-13 06:25:42 - 2026-05-13 06:25:42 2461173.76785 - 2461173.76785 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
582311 2026-05-13 06:25:42 2461173.76785 18.409 0.09 19.66 ABMag cyan-ATLAS ATLAS-CHL_ATLAS-04 30 Robot
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
306459 2026-05-28 13:40:24 GOTO_bot D. O'Neill, M. Pursiainen, K. Ackley et al. GOTO GOTO 20:30:20.163 -54:23:56.77 2026-05-05 17:32:55.680 19.38 L-GOTO PSN GOTO26eww GOTO N
303618 2026-05-14 09:20:10 ATLAS_Bot1 J. Tonry, L. Denneau, H. Weiland (IfA, University of Hawaii) et al. ATLAS ATLAS 20:30:20.180 -54:23:56.77 2026-05-13 06:25:42.240 18.409 cyan-ATLAS PSN ATLAS26fnz ATLAS 2026TNSTR2096....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
23783 2026-05-20 14:43:03 ePESSTOplus_Bot1 Jasvinderjit Khaulsay, Jonathan Quirola, Meng-Han Lee, Anirban Dutta, Aiswarya Sankar.K, A. Horowicz on behalf of ePESSTO+ ePESSTO+ SN Ia 0.055 1 ePESSTO+ 2026TNSCR2201....1K
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
23787 2026-05-20 07:00:07 ESO-NTT / EFOSC2-NTT 900 Jasvinderjit Khaulsay, Jonathan Quirola Meng-Han Lee, Anirban Dutta, Aiswarya Sankar.K ePESSTO+ tns_2026mld_2026-05-20_07-00-07_ESO-NTT_EFOSC2-NTT_ePESSTO+.asci tns_2026mld_2026-05-20_07-00-07_ESO-NTT_EFOSC2-NTT_ePESSTO+.fits Object

Comments