 Alight 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″ |
| Peakapparent magnitude | 12.8 |
SN 1940B was asupernova discovered on 5 May 1940 in the galaxyNGC 4725 inComa Berenices.[2] It had a magnitude of 12.8[3] and became the first observedtype II supernova.[4][clarification needed]
SN 1940B is one of the five supernovae discovered in 1940, the other beingSN 1940A,SN 1940C,SN 1940D andSN 1940E.
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