 | |
| Event type | Supernova |
|---|---|
| Type IIp[1] | |
| Date | c. 27.4 million years ago (discovered 28 June 2005 by Wolfgang Kloehr) |
| Constellation | Canes Venatici |
| Right ascension | 13h29m 53.37s[2] |
| Declination | +47° 10′ 28.2″[2] |
| Epoch | J2000 |
| Distance | 27.4 ± 2.3 Mly (8.4 ± 0.7 Mpc)[3] |
| Host | Whirlpool Galaxy[3] |
| Progenitor | 7–13 M☉[4] |
| Progenitor type | Red Supergiant[3] |
| Colour (B-V) | 0.14 ±0.02 |
| Peak apparent magnitude | 14.5[1] |
| Other designations | SN 2005cs |
 Related media on Commons | |
SN 2005cs was a supernova in the spiral galaxy M51,[3] known as the Whirlpool Galaxy. It was a type II-P core-collapse supernova, discovered June 28, 2005 by Wolfgang Kloehr, a German amateur astronomer.[5] The event was positioned at an offset of 15″ west and 78″ south of the galactic nucleus of M51.[2] Based on the data, the explosion was inferred to occur 2.8 days before discovery.[6] It was considered under-luminous for a supernova of its type, releasing an estimated 3×1050 erg in energy.[4]
The progenitor star was identified from a Hubble Space Telescope image taken January 20–21, 2005. It was a red supergiant with a spectral type in the mid-Ktolate-M type range and an estimated initial (ZAMS) mass of 9+3
−2 M☉. A higher mass star enshrouded in a cocoon of dust has been ruled out.[7]
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