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| Event type | Supernova,high-mass X-ray binaries  |
|---|---|
| II-P | |
| Date | 31 July 2004 18:15UTC |
| Constellation | Camelopardalis |
| Right ascension | 07h 37m 17.044s |
| Declination | +65° 35′ 57.84″ |
| Epoch | J2000.0 |
| Galactic coordinates | ? |
| Distance | about 11,000,000 light-years[1] |
| Remnant | Nebula |
| Host | NGC 2403 |
| Progenitor | Unknown star in compact clusterSandage 96 |
| Progenitor type | Supergiant |
| Colour (B-V) | Unknown |
| Notable features | Light Curves |
| Peakapparent magnitude | +11.2 |
| Other designations | SN 2004dj, CXOU J073717.1+653557, CXO J073717.0+653557 |
 Related media on Commons | |
SN 2004dj was the brightestsupernova sinceSN 1987A at the time of its discovery.[citation needed]
ThisType II-P supernova was discovered byJapaneseastronomerKōichi Itagaki on 31 July 2004. At the time of its discovery, its apparent brightness was 11.2visual magnitude; the discovery occurred after the supernova had reached itspeak magnitude.[2][3] The supernova's progenitor is a star in a young, compactstar cluster in thegalaxyNGC 2403, inCamelopardalis. The cluster had been cataloged as the 96th object in a list of luminousstars and clusters byAllan Sandage in 1984; the progenitor is therefore commonly referred to as Sandage 96. This cluster is easily visible in aKitt Peak National Observatory image and appears starlike.
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