SN 1940B was a supernova discovered on 5 May 1940 in the galaxy NGC 4725 in Coma Berenices. It had a magnitude of 12.8[1] and became the first observed type II supernova.[2][clarification needed]
SN 1940B is one of the five supernovae discovered in 1940, the other being , , and .
References[]
^"List of Supernovae". IAU Central Bureau for Astronomical Telegrams. Retrieved 12 December 2016.
^Albert G. Petschek, ed. (2012). Supernovae. Springer Science & Business Media. p. 60. ISBN978-1461232865.
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