TNS Classification Report No. 21976 [ 2025TNSCR3593....1M ]
Date Received (UTC): 2025-09-06 11:40:59 Sender: Moses Mlangeni
Group: BlackGEM
Moses Mlangeni (UCT/SAAO), Francois Campher (UCT/SAAO), Lloyd Lansburg (UCT/SAAO), Yusuke Tampo (SAAO), Paul Groot (UCT/SAAO/Radboud), Erez Zimmerman (Weizmann), Gavin Ramsay (Armagh) report/s a classification of object: AT 2025wyg
Type: Nova
Remarks: We obtained an optical spectrum of AT 2025wyg on 2025-09-05 17:19:40 UTC using the 1.0-m Lesedi telescope at the South African Astronomical Observatory equipped with the Mookodi spectrograph. The spectrum (4200–8000 Å; R ≈ 350) shows a blue continuum with strong Balmer emission, most prominently Hα, which exhibits a clear P-Cygni profile. The absorption minimum of Hα lies at ~6515 Å, corresponding to an expansion velocity of ~2200 km s⁻¹ relative to rest. Additional Fe II multiplet features (λ4924) also display P-Cygni structure. The presence of Balmer and Fe II P-Cygni profiles, with moderate expansion velocities, are characteristic of Fe II novae shortly after outburst. The absence of host galaxy features and the Galactic location of the source indicate that AT 2025wyg is a Galactic nova. We therefore classify AT 2025wyg as a classical nova of the Fe II spectroscopic type.
The following Classification spectrum was provided:
Obsdate: 2025-09-05 17:19:40
Instrument: Mookodi
Telescope: Lesedi 1m
Remarks: Lesedi/Mookodi spectrum (4200–8000 Å, R ≈ 350) obtained on 2025-09-05 shows strong Balmer emission with P-Cygni profiles (Hα absorption minimum at ~6515 Å → v ≈ 2200 km s⁻¹) and Fe II multiplet P-Cygni (λ4924) at redshift 0. The spectral features confirm AT 2025wyg as a Galactic Fe II classical nova.
Details of the object and its spectra can be viewed here: https://www.wis-tns.org/object/2025wyg
Date Received (UTC): 2025-09-06 11:40:59 Sender: Moses Mlangeni
Group: BlackGEM
Moses Mlangeni (UCT/SAAO), Francois Campher (UCT/SAAO), Lloyd Lansburg (UCT/SAAO), Yusuke Tampo (SAAO), Paul Groot (UCT/SAAO/Radboud), Erez Zimmerman (Weizmann), Gavin Ramsay (Armagh) report/s a classification of object: AT 2025wyg
Type: Nova
Remarks: We obtained an optical spectrum of AT 2025wyg on 2025-09-05 17:19:40 UTC using the 1.0-m Lesedi telescope at the South African Astronomical Observatory equipped with the Mookodi spectrograph. The spectrum (4200–8000 Å; R ≈ 350) shows a blue continuum with strong Balmer emission, most prominently Hα, which exhibits a clear P-Cygni profile. The absorption minimum of Hα lies at ~6515 Å, corresponding to an expansion velocity of ~2200 km s⁻¹ relative to rest. Additional Fe II multiplet features (λ4924) also display P-Cygni structure. The presence of Balmer and Fe II P-Cygni profiles, with moderate expansion velocities, are characteristic of Fe II novae shortly after outburst. The absence of host galaxy features and the Galactic location of the source indicate that AT 2025wyg is a Galactic nova. We therefore classify AT 2025wyg as a classical nova of the Fe II spectroscopic type.
The following Classification spectrum was provided:
Obsdate: 2025-09-05 17:19:40
Instrument: Mookodi
Telescope: Lesedi 1m
Remarks: Lesedi/Mookodi spectrum (4200–8000 Å, R ≈ 350) obtained on 2025-09-05 shows strong Balmer emission with P-Cygni profiles (Hα absorption minimum at ~6515 Å → v ≈ 2200 km s⁻¹) and Fe II multiplet P-Cygni (λ4924) at redshift 0. The spectral features confirm AT 2025wyg as a Galactic Fe II classical nova.
Details of the object and its spectra can be viewed here: https://www.wis-tns.org/object/2025wyg