SN 2005bc
SN 2005bc was a Type Ia supernova occurring in the Barred spiral galaxy NGC 5698 in the constellation of Boötes. SN 2005bc was discovered on 2 April 2005 by LOSS and independently by Tim Puckett and L. Cox.
 | |
| Other designations | SN 2005bc |
|---|---|
| Event type | Supernova  |
| Spectral class | Ia |
| Date | 2 April 2005 |
| Constellation | Boötes |
| Right ascension | 14h 37m 15.050s |
| Declination | +38° 27′ 23.10″ |
| Epoch | J2000.0 |
| Galactic coordinates | Long 66.764500° Lat 65.168763° |
| Distance | about 200,000,000 light-years |
| Redshift | 0.0132, 0.0122 |
| Remnant | unknown |
| Host | NGC 5698 |
| Progenitor | Unknown |
| Progenitor type | White Dwarf |
| Colour (B-V) | Unknown |
| Notable features | None |
| Peak apparent magnitude | +15.3 |
Discovery
The supernova was at magnitude 16.4 at discovery, and quickly rose to a peak magnitude of around 15.3 (in visible light) just over a week after discovery. By mid-May, the supernova had faded to 17th magnitude.
The host galaxy, NGC 5698, along with the supernova lie approximately 200 million light-years (~60 million parsecs) from Earth. This puts the absolute magnitude of the supernova at around −18.6 at maximum, rather faint for a Type Ia event.
As the supernova was of Type Ia, its progenitor star was a White Dwarf star which exceeded the Chandrasekhar limit.
Below is an image of SN 2005bc and NGC 5698 taken just over a week after peak brightness.