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SN 1993J

Supernova in the spiral galaxy Messier 81

Field	Value
epoch	J2000
ra
dec
image	Artist's impression of supernova 1993J.jpg
caption	Artist's impression of supernova 1993J
mag_v	+10.7
event_type	Supernova	type=Type IIb
distance	11.8 million ly
constellation	Ursa Major
discovery	11.8 million years ago

(28 March 1993 by Francisco Garcia Diaz)}}

SN 1993J is a supernova observed in Bode's Galaxy (M81). It was discovered on 28 March 1993 by amateur astronomer Francisco Garcia Diaz in Lugo, Spain.{{cite journal | display-authors=9 peaking at a visible apparent magnitude of 10.7 on March 30, with a second peak of 10.86 on April 18.

The spectral characteristics of the supernova changed over time. Initially, it looked more like a Type II supernova (a supernova formed by the explosion of a giant star) with strong hydrogen spectral line emission, but later the hydrogen lines faded and strong helium spectral lines appeared, making the supernova look more like a Type Ib.{{cite journal | author-link11=Thomas J. Balonek | doi-access=free

Light echoes from the explosion have subsequently been detected.

The progenitor of SN 1993J was identified in pre-explosion ground-based images. The progenitor was observed to be a K-type supergiant star, with an excess in the ultraviolet possibly due to surrounding hot stars or a hot binary companion. While the supernova is located in a region populated by young massive stars,{{cite journal | title = The Progenitor of Supernova 1993J Revisited | journal = Publications of the Astronomical Society of the Pacific | date = 2002 | first = S.D. | last = Van Dyk

References

"SN 1993J".
Sugerman, Ben. (November 8, 2002). "Multiple Light Echoes from Supernova 1993J". The Astrophysical Journal.
Aldering, G.. (1994). "SN 1993J: The optical properties of its progenitor". Astronomical Journal.
Maund, J.. (2004). "The massive binary companion star to the progenitor of supernova 1993J". Nature.

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