RA/DEC (2000)
12:12:12.756 +13:13:18.30
183.0531491 +13.221751
Type
SN Ia
Redshift
0.00758
Discovery ReportClassification Report
Related AstroNotes: 2026-4
Reporting Group
ATLAS
Discovering Data Source
ATLAS
Discovery Date
2026-01-14 12:55:23.808
TNS AT
Y
Public
Y
Discovery Mag
18.876
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_2026acd - 2026-01-19 06:55:45 P60 / SEDM (ZTF)z=
 ▌SN_2026acd - 2026-01-15 06:58:10 Gemini-S / GMOS-S (PASSTA)z=
 ▌SN_2026acd - 2026-01-15 03:22:47 LT / SPRAT (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
   Binning factor: (rounded to nearest integer >1)
Mouse hovers at WL: 0 (rest),0 (observed)

Light curves

 ▌ATLAS-TDO_ATLAS-05_wide
 ▌GOTO-N_GOTO-1_L
 ▌P48_ZTF-Cam_r
 ▌P48_ZTF-Cam_g
 ▌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
22839 2026-01-19 06:55:45 P60 / SEDM 2160 SEDmRobot auto ZTF tns_2026acd_2026-01-19_06-55-45.473590_P60_SEDM_ZTF.ascii Object
22771 2026-01-15 06:58:10 Gemini-S / GMOS-S 600 Roque Ruiz, Ariel Lopez J. Andrews PASSTA tns_2026acd_2026-01-15_06-58-10.2667_Gemini-S_GMOS-S_PASSTA.txt tns_2026acd_2026-01-15_06-58-10.2667_Gemini-S_GMOS-S_PASSTA.fits Object
22772 2026-01-15 03:22:47 LT / SPRAT Jacob Wise, Daniel Perley, Aleksandra Bochenek, Zoe McGrath, K-Ryan Hinds, Anna Ho Jacob Wise ZTF tns_2026acd_2026-01-15_03-22-46.663_LT_SPRAT_ZTF.spec Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
wide-ATLAS ATLAS-TDO_ATLAS-05 2026-01-13 05:05:39 - 2026-01-13 05:05:39 2461053.71226 - 2461053.71226 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
549856 2026-01-13 05:05:39 2461053.71226 19.82 ABMag wide-ATLAS ATLAS-TDO_ATLAS-05 30 Robot [Last non detection]
L-GOTO GOTO-N_GOTO-1 2025-12-31 04:38:09 - 2026-01-15 03:46:18 2461040.69316 - 2461055.657151 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
552301 2026-01-15 03:46:18 2461055.657151 17.95 0.03 ABMag L-GOTO GOTO-N_GOTO-1 180
552300 2025-12-31 04:38:09 2461040.69316 20.1 ABMag L-GOTO GOTO-N_GOTO-1 180 [Last non detection]
r-ZTF P48_ZTF-Cam 2026-01-13 12:34:54 - 2026-01-14 09:27:35 2461054.0242361 - 2461054.8941551 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
549885 2026-01-14 09:27:35 2461054.8941551 19.0947 0.096308 ABMag r-ZTF P48_ZTF-Cam
549884 2026-01-13 12:34:54 2461054.0242361 20.0322 ABMag r-ZTF P48_ZTF-Cam [Last non detection]
g-ZTF P48_ZTF-Cam 2026-01-14 11:06:25 - 2026-01-14 11:06:25 2461054.9627894 - 2461054.9627894 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
549886 2026-01-14 11:06:25 2461054.9627894 19.4976 0.123478 ABMag g-ZTF P48_ZTF-Cam
orange-ATLAS ATLAS-MLO_ATLAS-01 2026-01-14 12:55:24 - 2026-01-14 12:55:24 2461055.03847 - 2461055.03847 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
549857 2026-01-14 12:55:24 2461055.03847 18.876 0.13 19.61 ABMag orange-ATLAS ATLAS-MLO_ATLAS-01 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
288168 2026-01-21 10:40:09 GOTO_bot G. Ramsay,M. Pursiainen,K. Ackley et al. GOTO GOTO 12:12:12.718 +13:13:18.57 2026-01-15 03:46:17.760 17.95 L-GOTO PSN GOTO26jv GOTO N
287143 2026-01-14 19:46:14 Fritz Jesper Sollerman (SU),Christoffer Fremling (Caltech),Daniel Perley (LJMU) et al. ZTF ZTF 12:12:12.756 +13:13:18.30 2026-01-14 09:27:35.000 19.0947 r-ZTF PSN ZTF26aabbzvl ZTF N
287129 2026-01-14 16:31:04 ATLAS_Bot1 J. Tonry,L. Denneau,H. Weiland (IfA et al. ATLAS ATLAS 12:12:12.749 +13:13:18.43 2026-01-14 12:55:23.808 18.876 orange-ATLAS PSN ATLAS26anf ATLAS 2026TNSTR.153....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
22838 2026-01-22 02:04:15 ZTF_Bot1 C. Fremling, D. Neill, Y. Sharma on behalf of the SEDM Team (Caltech) and the Zwicky Transient Facility (ZTF) based on SNIascore ZTF SN Ia 0.00758 1 ZTF 2026TNSCR.295....1F
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
22839 2026-01-19 06:55:45 P60 / SEDM 2160 SEDmRobot auto ZTF tns_2026acd_2026-01-19_06-55-45.473590_P60_SEDM_ZTF.ascii Object
22771 2026-01-15 09:13:13 Jacob Wise Jacob Wise (LJMU), Daniel Perley (LJMU), Aleksandra Bochenek (LJMU), Zoe McGrath (LJMU), K-Ryan Hinds (Caltech), Anna Ho (Cornell) ZTF SN Ia 0.00758 1 1 ZTF Spectrum is well-fit to template spectra from previously classified young SN Ia-norm events. Redshift of z = 0.00758 ± 0.00001 from SDSS DR16. Classification performed using Next Generation Superfit (NGSF, Goldwasser et al. 2022). 2026TNSCR.177....1W
Related files
File Comments Last Modified (UT) Modified By
tns_2026acd_atrep_22771_ZTF.pdf NGSF fits 2026-01-15 09:13:13 Jacob Wise
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
22772 2026-01-15 03:22:47 LT / SPRAT Jacob Wise, Daniel Perley, Aleksandra Bochenek, Zoe McGrath, K-Ryan Hinds, Anna Ho Jacob Wise ZTF tns_2026acd_2026-01-15_03-22-46.663_LT_SPRAT_ZTF.spec Object
22770 2026-01-15 09:11:44 Jennifer Andrews Jennifer Andrews (Gemini-N/NOIRLab), A. P. Ravi (UC Davis), M. Shrestha (Monash U), Bhagya Subrayan (U of Arizona), Azalee Bostroem (U of Arizona), J. Pearson (U of Arizona), G. Hosseinzadeh (UCSD), D. J. Sand (U of Arizona), C. L. Ransome (U of Arizona), J. Carney (UNC Chapel Hill), and C. D. Kilpatrick (Northwestern U) on behalf of the PASSTA collaboration PASSTA SN Ia 1 DLT40, PASSTA We report the classification of SN 2026acd as a young SN Ia with very little reddening based on optical spectra obtained on UT 2026 Jan 15 using the GMOS spectrograph on Gemini-S. This target was classified using SNID (Blondin & Tonry 2007) and provided a best match to a normal type Ia about two weeks before maximum. We encourage follow-up spectroscopy. For more information on the Public AEON Spectroscopic Survey for Transient Astronomy (PASSTA), visit astro-passta.github.io or Astronote 2025-280. 2026TNSCR.175....1A
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
22771 2026-01-15 06:58:10 Gemini-S / GMOS-S 600 Roque Ruiz, Ariel Lopez J. Andrews PASSTA tns_2026acd_2026-01-15_06-58-10.2667_Gemini-S_GMOS-S_PASSTA.txt tns_2026acd_2026-01-15_06-58-10.2667_Gemini-S_GMOS-S_PASSTA.fits Object

Comments

TNS
System

Wed, 01/14/2026 - 19:46

Object coordinates updated

Object coordinates updated according to AT-report 287143 of Group ZTF
Previous RA, DEC: 12:12:12.749, +13:13:18.43 (183.05312, +13.2217857143)
Updated RA, DEC: 12:12:12.756, +13:13:18.30 (183.0531491, +13.221751)