RA/DEC (2000)
09:48:42.485 +44:04:27.95
147.1770227 +44.0744297
Type
SN IIb
Redshift
0.01657
Discovery ReportClassification Report
Reporting Group
None
Discovering Data Source
None
Discovery Date
2026-09-21 19:40:32.000
TNS AT
Y
Public
Y
Host Name
NGC2998
Comments
[Object cross-matched with NGC2998]
Discovery Mag
17.7
Filter
Clear-
Reporter/s
Koichi Itagaki
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌SN_2026acpp - 2026-10-01 11:42:47 P60 / SEDM (ZTF)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
z-step:   v-step: 
   Binning factor: (rounded to nearest integer >1)
Mouse hovers at WL: 0 (rest),0 (observed)

Light curves

 ▌P48_ZTF-Cam_r
 ▌ATLAS-MLO_ATLAS-01_orange
 ▌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
24806 2026-10-01 11:42:47 P60 / SEDM 2160 SEDmRobot auto ZTF tns_2026acpp_2026-10-01_11-42-46.866010_P60_SEDM_ZTF.ascii Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
r-ZTF P48_ZTF-Cam 2026-09-29 12:33:21 - 2026-09-29 12:33:21 2461313.0231597 - 2461313.0231597 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
622849 2026-09-29 12:33:21 2461313.0231597 17.3849 0.0566371 19.2947 ABMag r-ZTF P48_ZTF-Cam 30 Robot Data provided by ZTF
orange-ATLAS ATLAS-MLO_ATLAS-01 2026-09-30 15:21:26 - 2026-10-01 14:36:16 2461314.13988 - 2461315.10852 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
623320 2026-10-01 14:36:16 2461315.10852 17.241 0.068 18.55 ABMag orange-ATLAS ATLAS-MLO_ATLAS-01 30 Robot
623319 2026-09-30 15:21:26 2461314.13988 17.77 ABMag orange-ATLAS ATLAS-MLO_ATLAS-01 30 Robot [Last non detection]
Clear- Other_Other 2026-09-21 19:40:32 - 2026-09-21 19:40:32 2461305.3198148 - 2461305.3198148 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
621007 2026-09-21 19:40:32 2461305.3198148 17.7 VegaMag Clear- Other_Other 0.35-m F/11 + CCD (KAF-1001E) unfiltered
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
326094 2026-10-01 20:20:56 ATLAS_Bot1 J. Tonry, L. Denneau, H. Weiland et al. ATLAS ATLAS 09:48:42.488 +44:04:28.01 2026-10-01 14:36:16.128 17.241 orange-ATLAS PSN ATLAS26lxt ATLAS N
325844 2026-09-30 12:58:08 ALeRCE A. Munoz-Arancibia, F.E. Bauer, G. Pignata et al. ALeRCE ZTF 09:48:42.485 +44:04:27.95 2026-09-29 12:33:20.998 17.3849 r-ZTF PSN NGC2998 ZTF26abyamcg ZTF SN candidate classified using ALeRCE's stamp classifier (Carrasco-Davis et al. 2021) and the public ZTF stream. Discovery image and light curve in http://alerce.online/object/ZTF26abyamcg N
324565 2026-09-21 23:30:24 Koichi Itagaki Koichi Itagaki 09:48:42.410 +44:04:27.20 2026-09-21 19:40:32.000 17.7 Clear- PSN ngc2998 2026TNSTR3814....1I N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
24798 2026-10-01 12:34:13 ZTF_Bot1 J. Sollerman, J. Castaneda Jaimes, C. Fremling (Caltech) on behalf of the Zwicky Transient Facility (ZTF) ZTF SN IIb 0.01657 1 ZTF 2026TNSCR3951....1S
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
24806 2026-10-01 11:42:47 P60 / SEDM 2160 SEDmRobot auto ZTF tns_2026acpp_2026-10-01_11-42-46.866010_P60_SEDM_ZTF.ascii Object

Comments

TNS
System

Wed, 09/30/2026 - 12:58

Object coordinates updated

Object coordinates updated according to AT-report 325844 of Group ZTF
Previous RA, DEC: 09:48:42.410, +44:04:27.20 (147.176708, +44.074222)
Updated RA, DEC: 09:48:42.485, +44:04:27.95 (147.1770227, +44.0744297)