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On Tuesday, September 1, the ATLAS System discovered the new supernova SN 2026aaiv in NGC 7331 in Pegasus. It is a Type 1a supernova, and at the time of discovery, it had a magnitude of 15.7.
Most people probably remember that a supernova was discovered in NGC 7331 just last year: SN 2025rbs in July 2025.
The new SN found at 22:37:05.618 +34:24:35.37 and is closer to the centerObservation on September 4th
https://britastro.org/observations/observation.php?id=20260906_113344_57bb2dd3c9c77f91A quick spectrum last night between breaks in the cloud.
https://britastro.org/specdb/data_graph.php?obs_id=21438
Noisy but clearly a type Ia with a good match to several templates using SNID-SAGE at ~ one week pre maximum. (example attached).
The 6355A Si II absorption is at ~6135A giving an explosion velocity of ~ 9500km/s + 900km/s galaxy redshift = ~10500km/s significantly lower than ~13000km/s two nights earlier from spectra in TNSCheers
Robin
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