SN 1940B

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]

SN 1940B
Event typeSupernova Edit this on Wikidata
Spectral classSN.IIP Edit this on Wikidata
Date5 May 1940
ConstellationComa Berenices
Right ascension12h 50m 33.0s
Declination+25° 32′ 12″
Peak apparent magnitude12.8

SN 1940B is one of the five supernovae discovered in 1940, the other being SN 1940A, SN 1940C, SN 1940D and SN 1940E.


  1. ^ "List of Supernovae". IAU Central Bureau for Astronomical Telegrams. Retrieved 12 December 2016.
  2. ^ Albert G. Petschek, ed. (2012). Supernovae. Springer Science & Business Media. p. 60. ISBN 978-1461232865.

External linksEdit