2025aluu | Transient Name Server

RA/DEC (2000)

10:05:16.241 +02:23:42.78

151.31767 +2.395216

Type

SN II

Redshift

0.0934

Discovery Report Classification Report

Related AstroNotes: 2026-81

Reporting Group

DESIRT

Discovering Data Source

Rubin

Discovery Date

2025-12-15 05:54:08.000

TNS AT

Public

Discovery Mag

21.948

Filter

i-LSST

Reporter/s

Xander J. Hall on behalf of the DESI Transients Survey

NED SIMBAD DECaLS PanSTARRS-1 SkyMapper VizieR WISE DSS ADS

Light curves

▌

Rubin_LSSTCam_i

Pointer position (MJD, Mag, Abs.Mag): (0.00, 0.00, 0.00)

Spectra

Select	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
	23101	2026-02-26 08:01:33	Mayall / DESI	475.18	DESI		DESI	tns_2025aluu_2026-02-26_08-01-33.275_Mayall_DESI_DESI.ascii		Object			Spectrum shows a broad Hydrogen feature consistent with a type II SN
Binning factor: (rounded to nearest integer >1) Mouse hovers at WL: 0 (rest), 0 (observed) ▌Show H at z=v_exp= km/s ▌Show He at z=v_exp= km/s ▌Show He II at z=v_exp= km/s ▌Show C II at z=v_exp= km/s ▌Show C III at z=v_exp= km/s ▌Show C IV at z=v_exp= km/s ▌Show N II at z=v_exp= km/s ▌Show N III at z=v_exp= km/s ▌Show N IV at z=v_exp= km/s ▌Show N V at z=v_exp= km/s ▌Show O at z=v_exp= km/s ▌Show [O I] at z=v_exp= km/s ▌Show O II at z=v_exp= km/s ▌Show [O II] at z=v_exp= km/s ▌Show [O III] at z=v_exp= km/s ▌Show O V at z=v_exp= km/s ▌Show O VI at z=v_exp= km/s ▌Show Na at z=v_exp= km/s ▌Show Mg at z=v_exp= km/s ▌Show Mg II at z=v_exp= km/s ▌Show Si II at z=v_exp= km/s ▌Show S II at z=v_exp= km/s ▌Show Ca II at z=v_exp= km/s ▌Show [Ca II] at z=v_exp= km/s ▌Show Fe II at z=v_exp= km/s ▌Show Fe III at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Tellurics ▌Show Galaxy lines at z= ▌Show WR-WN at z=v_exp= km/s ▌Show WR-WC/O at z=v_exp= km/s Remarks Spectrum shows a broad Hydrogen feature consistent with a type II SN

Light Curves

Filter

Tel / Inst

Obs-date range

JD Range

Photometry

i-LSST

Rubin_LSSTCam

2025-12-15 05:54:08 - 2025-12-15 05:54:08

2461024.7459259 - 2461024.7459259

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
561966	2025-12-15 05:54:08	2461024.7459259	21.948	0.077479	23.0669	ABMag	i-LSST	Rubin_LSSTCam

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
293200	2026-02-27 00:57:54	Xander Hall	Xander J. Hall on behalf of the DESI Transients Survey	DESIRT	Rubin	10:05:16.241	+02:23:42.78	2025-12-15 05:54:08.000	21.948	i-LSST		PSN		313853517432881258	DESIRT, Rubin			2026TNSTR.858....1H	N

Classification Reports

Time received (UT)

Sender

Classifier/s

Group

Classification

Redshift

Spectra

Related files

Assoc. Groups

End prop. period

Remarks

ADS Bibcode

23100

2026-02-27 01:10:43

Xander Hall

Xander J. Hall (CMU), John Banovez (LBNL), Antonella Palmese (CMU), Stephen Bailey (LBNL), Segev BenZvi (U Rochester), Dylan Green (LBNL), Adam Myers (U of Wyoming), David Schlegel (LBNL), on behalf of the DESI Collaboration

DESI

SN II

0.0934

DESI

Classified as part of the DESI Transients Survey (DTS; Hall et al. 2026)

2026TNSCR.868....1H

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
23101	2026-02-26 08:01:33	Mayall / DESI	475.18	DESI		DESI	tns_2025aluu_2026-02-26_08-01-33.275_Mayall_DESI_DESI.ascii		Object			Spectrum shows a broad Hydrogen feature consistent with a type II SN

SN 2025aluu

Spectra

Light curves

Comments