RA/DEC (2000)
10:38:47.961 +53:30:34.10
159.6998395 +53.5094715
Type
SN Ia-CSM
Redshift
0.003312
Discovery ReportClassification Report
Related AstroNotes: 2026-214, 2026-219, 2026-222, 2026-240
Reporting Group
None
Discovering Data Source
None
Discovery Date
2026-07-08 06:01:09.000
TNS AT
Y
Public
Y
Host Name
NGC 3310
Discovery Mag
12.9
Filter
Clear-
Reporter/s
Patrick Wiggins
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌SN_2026sqf - 2026-07-20 22:48:56 Other / Other (None)z=
 ▌SN_2026sqf - 2026-07-19 21:18:06 NOT / ALFOSC (ZTF)z=
 ▌SN_2026sqf - 2026-07-08 21:12:02 LT / SPRAT (ZTF)z=
 ▌SN_2026sqf - 2026-07-08 20:35:00 BL41 / FOSC-E5535 (None)z=
▌Show H at z=vexp= km/s
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▌Show Galaxy lines at z=
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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

 ▌P48_ZTF-Cam_r
 ▌Other_Other_R
 ▌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
24366 2026-07-20 22:48:56 Other / Other 3600 R Leadbeater R Leadbeater None tns_2026sqf_2026-07-20_22-48-56_Other_Other_None.dat tns_2026sqf_2026-07-20_22-48-56_Other_Other_None.fit Object R~500 spectrum obtained using an ALPY 600 spectrograph at Three Hills Observatory
24434 2026-07-19 21:18:06 NOT / ALFOSC oliver tapio Anjasha Gangopadhyay ZTF tns_2026sqf_2026-07-19_21-18-05.817_NOT_ALFOSC_ZTF.ascii Object
24195 2026-07-08 21:12:02 LT / SPRAT Jacob Wise, Daniel Perley, K-Ryan Hinds, Aleksandra Bochenek, Zoe McGrath, Yogesh Wagh Jacob Wise ZTF tns_2026sqf_2026-07-08_21-12-02.349_LT_SPRAT_ZTF.spec Object
24194 2026-07-08 20:35:00 BL41 / FOSC-E5535 1800 Claudio Balcon Claudio Balcon None tns_2026sqf_2026-07-08_20-35-00_BL41_FOSC-E5535_None.dat tns_2026sqf_2026-07-08_20-35-00_BL41_FOSC-E5535_None.fit Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
r-ZTF P48_ZTF-Cam 2026-06-09 04:41:33 - 2026-07-08 04:12:09 2461200.6955208 - 2461229.6751042 3
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
600312 2026-07-08 04:12:09 2461229.6751042 13.8691 0.0323099 ABMag r-ZTF P48_ZTF-Cam
600311 2026-07-08 03:58:48 2461229.6658333 13.8784 0.0257001 ABMag r-ZTF P48_ZTF-Cam
600310 2026-06-09 04:41:33 2461200.6955208 20.354 ABMag r-ZTF P48_ZTF-Cam [Last non detection]
R-Cousins Other_Other 2026-07-15 00:00:00 - 2026-07-15 00:00:00 2461236.5 - 2461236.5 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
604708 2026-07-15 00:00:00 2461236.5 13.9 0.05 ABMag R-Cousins Other_Other 300 Voronov Andrey Stack of 15×300s frames. Differential aperture photometry in ASTAP, calibrated with Gaia DR3.
Clear- Other_Other 2025-04-13 23:15:00 - 2026-07-17 19:00:00 2460779.46875 - 2461239.2916667 5
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
605059 2026-07-17 19:00:00 2461239.2916667 13.9 ABMag Clear- Other_Other 180 Voronov Andrey [Last non detection] Stack of 10 x 180s, ZWO ASI585MM, Samyang 135mm f/3.5
604707 2026-07-15 01:00:00 2461236.5416667 18 ABMag Clear- Other_Other 300 Voronov Andrey [Last non detection] Instrument: Samyang 135mm f/3.5 + ZWO 585MM (Clear), Samyang 135mm f/3.5 + ZWO 533MM (R)
600208 2026-07-08 06:01:09 2461229.7507986 12.9 STMag Clear- Other_Other 0.35-m f/5.5 reflector
600207 2026-07-05 05:32:23 2461226.7308218 19 STMag Clear- Other_Other [Last non detection] 0.35-m f/5.5 reflector
605060 2025-04-13 23:15:00 2460779.46875 13.9 0.2 18 ABMag Clear- Other_Other 180 Voronov Andrey Stack of 10 x 180s, ZWO ASI585MM, Samyang 135mm f/3.5
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
315759 2026-07-18 01:48:00 Andrey Voronov Andrey Voronov, Alexey Baigashov, Pavel Vasiliev et al. 10:38:47.961 +53:30:34.10 2026-07-17 20:00:00.000 13.9 Clear- 1 PSN NGC 3310 SN 2026sqf Stack of 10 x 180s. Corrected coordinates for SN 2026sqf in NGC 3310. Observed with Samyang 135mm f/3.5 (Dual Rig) + ZWO ASI585MM, Clear filter. Magnitude 13.9 (instrumental, tied to Gaia DR3). Affiliation: IKBFU, Kaliningrad, Russia (DRSN135). N
Related files
File Comments Last Modified (UT) Modified By
tns_2026sqf_atrep_315759.jpg 2026-07-18 01:48:02 Andrey Voronov
315607 2026-07-16 06:55:02 Andrey Voronov .Andrey Voronov (IKBFU), Alexey Baygashov (IKBFU), Maxim Tsarkov (IKBFU) et al. 10:38:47.961 +53:30:34.10 2026-07-15 23:30:00.000 13.9 R-Cousins PSN NGC 3310 DRSN135-20260716 Follow-up observation of SN 2026sqf in NGC 3310. Object is stationary on stacked frames. Brightness ~13.9 mag, consistent with Type II classification. Differential aperture photometry performed in ASTAP, calibrated with Gaia DR3. 2026TNSTR2950....1V N
313431 2026-07-08 15:36:13 Fritz Nabeel Rehemtulla (CIERA, NU), Christoffer Fremling (Caltech), Daniel Perley (LJMU) et al. ZTF ZTF 10:38:47.961 +53:30:34.10 2026-07-08 03:58:47.997 13.8784 r-ZTF PSN ZTF26abfmmvq ZTF N
313386 2026-07-08 06:31:30 Patrick Wiggins Patrick Wiggins 10:38:48.000 +53:30:34.00 2026-07-08 06:01:09.000 12.9 Clear- PSN NGC 3310 P. Wiggins. Universitv of Utah. Utah. USA reports his discover off a possible supernova mag about 12.9 on an unfiltered CCD frame taken 2026 Jul 08 using a 0.35-m refractor near Erda, Utah, USA 2026TNSTR2837....1W N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
24427 2026-08-07 15:13:54 Nabeel Rehemtulla Nabeel Rehemtulla (Northwestern), Wynn Jacobson-Galán (Caltech), Lindsey Kwok (Northwestern), Adam A. Miller (Northwestern), Anjasha Gangopadhyay (Stockholm University), Avinash Singh (Stockholm University), and Jesper Sollerman (Stockholm University) on behalf of the ZTF collaboration ZTF SN Ia-CSM 0.003312 1 ZTF 2026TNSCR3212....1R
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
24434 2026-07-19 21:18:06 NOT / ALFOSC oliver tapio Anjasha Gangopadhyay ZTF tns_2026sqf_2026-07-19_21-18-05.817_NOT_ALFOSC_ZTF.ascii Object
24359 2026-07-24 12:53:28 Robin Leadbeater Robin Leadbeater None SN 0.00331 1 3 The supernova is now approaching maximum brightness and the strong narrow Balmer H alpha and beta emission persists suggesting a prolonged interaction with circumstellar material. Possible re-classifications include IIn or possibly a rare Ia-CSM (SNID-SAGE matches for both options are attached along with a good match to an early ePESSTO spectrum of Ia-CSM SN 2018evt from WISEREP.) The classification has therefore been reverted to SN, pending further data to clarify the nature of this interesting object. 2026TNSCR3037....1L
Related files
File Comments Last Modified (UT) Modified By
tns_2026sqf_atrep_24359.png example SNID-SAGE fit to IIn 2026-07-24 12:53:28 Robin Leadbeater
tns_2026sqf_atrep_24359_0.png example SNID-SAGE fit to Ia-CSM 2026-07-24 12:53:28 Robin Leadbeater
tns_2026sqf_atrep_24359_1.png overlay on ePESSTO spectrum of SN 2018evt 2026-07-24 12:53:28 Robin Leadbeater
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
24366 2026-07-20 22:48:56 Other / Other 3600 R Leadbeater R Leadbeater None tns_2026sqf_2026-07-20_22-48-56_Other_Other_None.dat tns_2026sqf_2026-07-20_22-48-56_Other_Other_None.fit Object R~500 spectrum obtained using an ALPY 600 spectrograph at Three Hills Observatory
24189 2026-07-08 22:31:38 Jacob Wise Jacob Wise (LJMU), Daniel Perley (LJMU), Aleksandra Bochenek (LJMU), Zoe McGrath (LJMU), Yogesh Wagh (LJMU), K-Ryan Hinds (Caltech), Wynn Vicente Jacobson-Galan (Caltech), Nabeel Rehemtulla (Northwestern) ZTF SN II 0.00331 1 ZTF Spectrum displays prominent hydrogen balmer, HeII and NIII (and possibly CIV) emission, reminiscent of SN 2023ixf at very early epochs.We classify 2026sqf as a a SN II with features from flash-ionised CSM. 2026TNSCR2847....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
24195 2026-07-08 21:12:02 LT / SPRAT Jacob Wise, Daniel Perley, K-Ryan Hinds, Aleksandra Bochenek, Zoe McGrath, Yogesh Wagh Jacob Wise ZTF tns_2026sqf_2026-07-08_21-12-02.349_LT_SPRAT_ZTF.spec Object
24188 2026-07-08 21:29:33 Claudio Balcon Claudio Balcon (Belluno A.O. ISSP) None SN 0.003299 1 The spectrum shows a blue continuum with flash features, often seen in young CC SNe, likely a type II or IIn SN. Redshift taken from NED. 2026TNSCR2843....1B
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
24194 2026-07-08 20:35:00 BL41 / FOSC-E5535 1800 Claudio Balcon Claudio Balcon None tns_2026sqf_2026-07-08_20-35-00_BL41_FOSC-E5535_None.dat tns_2026sqf_2026-07-08_20-35-00_BL41_FOSC-E5535_None.fit Object

Comments

TNS
System

Mon, 07/20/2026 - 15:25

AT Report/s were associated with object

None AT report/s 315607 for 2026uxt were associated with object SN2026sqf.
Object 2026uxt was removed from the system.

TNS
System

Wed, 07/08/2026 - 15:36

Object coordinates updated

Object coordinates updated according to AT-report 313431 of Group ZTF
Previous RA, DEC: 10:38:48.000, +53:30:34.00 (159.7, +53.509444)
Updated RA, DEC: 10:38:47.961, +53:30:34.10 (159.6998395, +53.5094715)