RA/DEC (2000)
20:07:38.301 -21:07:06.40
301.909587 -21.118444
Type
SN IIn
Redshift
0.008
Discovery ReportClassification Report
Related AstroNotes: 2026-132, 2026-138
Reporting Group
ATLAS
Discovering Data Source
ATLAS
Discovery Date
2026-05-12 07:38:17.664
TNS AT
Y
Public
Y
Discovery Mag
17.836
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, 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_2026mho - 2026-05-17 06:13:57 ESO-NTT / EFOSC2-NTT (ePESSTO+)z=
 ▌SN_2026mho - 2026-05-13 20:11:18 Lijiang-2.4m / YFOSC (LiONS)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-3_L
 ▌GOTO-N_GOTO-2_L
 ▌ATLAS-CHL_ATLAS-04_orange
 ▌ATLAS-MLO_ATLAS-01_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
23738 2026-05-17 06:13:57 ESO-NTT / EFOSC2-NTT 1200 J. Khaulsay,J. Quirola-Vásquez C. Aster ePESSTO+ tns_2026mho_2026-05-17_06-13-57_ESO-NTT_EFOSC2-NTT_ePESSTO+.asci tns_2026mho_2026-05-17_06-13-57_ESO-NTT_EFOSC2-NTT_ePESSTO+.fits Object
23712 2026-05-13 20:11:18 Lijiang-2.4m / YFOSC Jujia Zhang LiONS tns_2026mho_2026-05-13_20-11-17.679_Lijiang-2.4m_YFOSC_LiONS.dat Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
L-GOTO GOTO-S_GOTO-3 2026-05-05 16:47:59 - 2026-05-05 16:47:59 2461166.199993 - 2461166.199993 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
587855 2026-05-05 16:47:59 2461166.199993 19.5 ABMag L-GOTO GOTO-S_GOTO-3 180 [Last non detection]
L-GOTO GOTO-N_GOTO-2 2026-05-29 03:52:01 - 2026-05-29 03:52:01 2461189.661116 - 2461189.661116 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
587856 2026-05-29 03:52:01 2461189.661116 15.9 0.01 ABMag L-GOTO GOTO-N_GOTO-2 360
orange-ATLAS ATLAS-CHL_ATLAS-04 2026-05-12 07:38:18 - 2026-05-12 07:38:18 2461172.81826 - 2461172.81826 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
581842 2026-05-12 07:38:18 2461172.81826 17.836 0.077 19.37 ABMag orange-ATLAS ATLAS-CHL_ATLAS-04 30 Robot
orange-ATLAS ATLAS-MLO_ATLAS-01 2026-05-11 13:23:34 - 2026-05-11 13:23:34 2461172.05803 - 2461172.05803 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
581841 2026-05-11 13:23:34 2461172.05803 15.03 ABMag orange-ATLAS ATLAS-MLO_ATLAS-01 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
306525 2026-05-29 08:13:07 GOTO_bot D. O'Neill, M. Pursiainen, K. Ackley et al. GOTO GOTO 20:07:38.313 -21:07:06.18 2026-05-29 03:52:00.768 15.9 L-GOTO PSN GOTO26ffc GOTO N
303402 2026-05-12 14:26:16 ATLAS_Bot1 J. Tonry, L. Denneau, H. Weiland (IfA, University of Hawaii) et al. ATLAS ATLAS 20:07:38.301 -21:07:06.40 2026-05-12 07:38:17.664 17.836 orange-ATLAS PSN ATLAS26flx ATLAS 2026TNSTR2055....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
23735 2026-05-17 16:05:38 ePESSTOplus_Bot1 J. Khaulsay,J. Quirola-Vásquez, C. Aster, A. Horowicz on behalf of ePESSTO+ ePESSTO+ SN IIn 0.008 1 ePESSTO+ 2026TNSCR2146....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
23738 2026-05-17 06:13:57 ESO-NTT / EFOSC2-NTT 1200 J. Khaulsay,J. Quirola-Vásquez C. Aster ePESSTO+ tns_2026mho_2026-05-17_06-13-57_ESO-NTT_EFOSC2-NTT_ePESSTO+.asci tns_2026mho_2026-05-17_06-13-57_ESO-NTT_EFOSC2-NTT_ePESSTO+.fits Object
23709 2026-05-14 12:12:34 Liping Li Zeyi Wang, Liping Li, Qian Zhai, Bo Wang, Jujia Zhang (YNAO); Xiaofeng Wang(THU) LiONS SN II 0.0077 1 LiONS, YNTS The spectrum matches that of a young SN II. 2026TNSCR2105....1W
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
23712 2026-05-13 20:11:18 Lijiang-2.4m / YFOSC Jujia Zhang LiONS tns_2026mho_2026-05-13_20-11-17.679_Lijiang-2.4m_YFOSC_LiONS.dat Object

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