SN 1940B explained

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

External links

• Light curve on the Open Supernova Catalog
• SN 1940B at SIMBAD

Notes and References

1. Web site: List of Supernovae. IAU Central Bureau for Astronomical Telegrams. 12 December 2016.
2. Book: Albert G. Petschek. Supernovae. Springer Science & Business Media. 2012. 60. 978-1461232865.