SN 1940B

Event typeSupernova 

Date5 May 1940

ConstellationComa Berenices

Right ascension12^h 50^m 33.0^s

SN 1940B

A light curve for SN 1940B, plotted from data available in the Open Supernova Catalog[1]
Event type	Supernova
SN.IIP
Date	5 May 1940
Constellation	Coma Berenices
Right ascension	12h 50m 33.0s
Declination	+25° 32′ 12″
Peak apparent magnitude	12.8
[edit on Wikidata]

SN 1940B was a supernova discovered on 5 May 1940 in the galaxy NGC 4725 in Coma Berenices.^[2] It had a magnitude of 12.8^[3] and became the first observed type II supernova.^{[4][clarification needed]}

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