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SN 2004dj

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SN 2004dj
Event typeSupernova, high-mass X-ray binaries Edit this on Wikidata
II-P
Date31 July 2004 18:15 UTC
ConstellationCamelopardalis
Right ascension07h 37m 17.044s
Declination+65° 35′ 57.84″
EpochJ2000.0
Galactic coordinates?
Distanceabout 11,000,000 light-years [1]
RemnantNebula
HostNGC 2403
ProgenitorUnknown star in compact cluster Sandage 96
Progenitor typeSupergiant
Colour (B-V)Unknown
Notable featuresLight Curves
Peak apparent magnitude+11.2
Other designationsSN 2004dj, CXOU J073717.1+653557, CXO J073717.0+653557
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SN 2004dj was the brightest supernova since SN 1987A at the time of its discovery.

This Type II-P supernova was discovered by Koichi Itagaki, a Japanese astronomer on July 31, 2004. At the time of its discovery, its apparent brightness was 11.2 visual magnitude; the discovery occurred after the supernova had reached its peak magnitude. The supernova's progenitor is a star in a young, compact star cluster in the galaxy NGC 2403, in Camelopardalis. The cluster had been cataloged as the 96th object in a list of luminous stars and clusters by Allan Sandage in 1984; the progenitor is therefore commonly referred to as Sandage 96. This cluster is easily visible in a Kitt Peak National Observatory image and appears starlike.