SN 2021yfj

== History ==

== History ==

It was first seen at 09:56 [[Coordinated Universal Time|UTC]] on September 7, 2021 by the [[Zwicky Transient Facility]].<ref name=Schulze/><ref>{{Cite web |last=O’Callaghan |first=Jonathon |title=Onionlike Space Explosion May Be a New Type of Supernova |url=https://www.nytimes.com/2025/08/20/science/supernova-layers-elements.html |access-date=August 23, 2025 |website=[[The New York Times]]}}</ref> It has been proposed that SN 2021yfj should be placed into its own classification type known as [[Type len supernova|SN len]] based on its unique spectra. This would also leave a placeholder intermediate type of supernova known as [[Type idn supernova|SN idn]]. This possible type would have spectra that were dominated in either oxygen, neon or magnesium.<ref name=”:0″ />

It was first seen at 09:56 [[Coordinated Universal Time|UTC]] on September 7, 2021 by the [[Zwicky Transient Facility]].<ref name=Schulze/><ref>{{Cite web |last=O’Callaghan |first=Jonathon |title=Onionlike Space Explosion May Be a New Type of Supernova |url=https://www.nytimes.com/2025/08/20/science/supernova-layers-elements.html |access-date=August 23, 2025 |website=[[The New York Times]]}}</ref> It has been proposed that SN 2021yfj should be placed into its own classification type known as [[Type supernova|SN len]] based on its unique spectra. This would also leave a placeholder intermediate type of supernova known as [[Type idn supernova|SN idn]]. This possible type would have spectra that were dominated in either oxygen, neon or magnesium.<ref name=”:0″ />

== See also ==

== See also ==