RA/DEC (2000)
00:50:45.142 -71:38:36.96
12.68809 -71.6436
Type
Nova
Redshift
0.000426
Discovery ReportClassification Report
Reporting Group
ASAS-SN
Discovering Data Source
ASAS-SN
Discovery Date
2026-06-11 08:52:48.000
TNS AT
Y
Public
Y
Host Name
SMC
Discovery Mag
10.5
Filter
g-Sloan
Reporter/s
K. Z. Stanek, for the ASAS-SN team
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌AT_2026oyp - 2026-07-05 10:00:32 SOAR / Goodman (None)z=
 ▌AT_2026oyp - 2026-06-27 01:22:30 Lesedi / Mookodi (BlackGEM)z=
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   Binning factor: (rounded to nearest integer >1)
Mouse hovers at WL: 0 (rest),0 (observed)

Light curves

 ▌ASASSN-2_Cassius_g
 ▌Other_Other_Other
   
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
24175 2026-07-05 10:00:32 SOAR / Goodman Rebecca Kyer, Allison Crossland None tns_2026oyp_2026-07-05_10-00-32_SOAR_Goodman_None.dat Object
24152 2026-06-27 01:22:30 Lesedi / Mookodi SAAO IO BlackGEM tns_2026oyp_2026-06-27_01-22-30.050_Lesedi_Mookodi_BlackGEM.txt Object The spectrum shows prominent Balmer emission lines, including H$\alpha$, H$\beta$, and H$\gamma$, together with several metal lines characteristic of early-time nova spectra. In particular, we identify Fe II emission lines at 4924 Å, 5018 Å, and 5169 Å, as well as He I emission at 5876 Å and 7065 Å. Additional emission features consistent with N III near 4638 Å and O I at 7773 Å are also present. The presence of strong Balmer emission lines together with Fe II multiplet lines suggests that the transient is consistent with a classical nova in the SMC. We therefore classify AT2026oyp as a classical nova in the SMC with Fe II spectral characteristics, observed at an early stage of its eruption.
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
g-Sloan ASASSN-2_Cassius 2026-06-08 08:52:48 - 2026-06-11 08:52:48 2461199.87 - 2461202.87 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
591147 2026-06-11 08:52:48 2461202.87 10.5 ABMag g-Sloan ASASSN-2_Cassius
591146 2026-06-08 08:52:48 2461199.87 17 ABMag g-Sloan ASASSN-2_Cassius [Last non detection]
Other- Other_Other 2018-07-04 23:03:53 - 2026-07-07 21:34:47 2458304.46103 - 2461229.39915 3
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
600194 2026-07-07 21:34:47 2461229.39915 14.1 18.1 VegaMag Other- Other_Other 60 Robot MASTER-SAAO
600193 2026-07-07 21:33:12 2461229.39806 14.1 18.1 VegaMag Other- Other_Other 60 Robot MASTER-SAAO
600192 2018-07-04 23:03:53 2458304.46103 20.2 VegaMag Other- Other_Other 540 Robot [Last non detection] MASTER-SAAO
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
313381 2026-07-07 23:21:32 MASTER V.Shumkov, V.Lipunov, E.Gorbovskoy et al. MASTER MASTER 00:50:44.950 -71:38:37.70 2026-07-07 21:33:12.384 14.1 Other- PSN MASTER OT J005044.95-713837.7 MASTER N
308147 2026-06-11 15:54:25 Krzysztof Stanek K. Z. Stanek, for the ASAS-SN team ASAS-SN ASAS-SN 00:50:45.142 -71:38:36.96 2026-06-11 08:52:48.000 10.5 g-Sloan PNV SMC ASASSSN-26dt ASAS-SN Bright transient (g~10.5 mag) on the rise near the SMC, so possibly a classical Nova; matches to a known, faint CV Gaia DR3 4689290962169940224 2026TNSTR2444....1S N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
24169 2026-07-07 11:54:26 Jay Strader Jay Strader None Nova 1
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
24175 2026-07-05 10:00:32 SOAR / Goodman Rebecca Kyer, Allison Crossland None tns_2026oyp_2026-07-05_10-00-32_SOAR_Goodman_None.dat Object
24146 2026-06-29 14:43:44 Moses Mlangeni Moses Mlangeni (UCT/SAAO), Nadia Blagorodnova (ICCUB), Paul Groot (Radboud/UCT/SAAO) BlackGEM Nova 0.000426 1 BlackGEM We obtained an optical spectrum of AT2026oyp on 2026-06-27 01:22:30.050 UTC after it was reported to the TNS by ASAS-SN using the Lesedi 1.0-m telescope at the South African Astronomical Observatory (SAAO) equipped with the Mookodi spectrograph. The data was reduced with the Mookodi spectroscopic pipeline, and the resulting spectrum was analysed with SNID-Sage to extract a redshift of z=0.000426, which is consistent with redshift measurements of the SMC. We therefore classify AT2026oyp as a classical nova in the SMC with Fe II spectral characteristics, observed at an early stage of its eruption.
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
24152 2026-06-27 01:22:30 Lesedi / Mookodi SAAO IO BlackGEM tns_2026oyp_2026-06-27_01-22-30.050_Lesedi_Mookodi_BlackGEM.txt Object The spectrum shows prominent Balmer emission lines, including H$\alpha$, H$\beta$, and H$\gamma$, together with several metal lines characteristic of early-time nova spectra. In particular, we identify Fe II emission lines at 4924 Å, 5018 Å, and 5169 Å, as well as He I emission at 5876 Å and 7065 Å. Additional emission features consistent with N III near 4638 Å and O I at 7773 Å are also present. The presence of strong Balmer emission lines together with Fe II multiplet lines suggests that the transient is consistent with a classical nova in the SMC. We therefore classify AT2026oyp as a classical nova in the SMC with Fe II spectral characteristics, observed at an early stage of its eruption.

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