| IIP (was IIN )[1] | |
| Date | October 6, 2013 |
|---|---|
| Constellation | Pegasus |
| Right ascension | 23h 19m 44.67s |
| Declination | +10° 11′ 04.5″ |
| Epoch | J2000 |
| Galactic coordinates | 089.0254 -46.5583 |
| Distance | 160 Mly |
| Host | NGC 7610 |
| Progenitor | Unknown |
| Progenitor type | Red Supergiant[2] |
| Notable features | Earliest detailed observations of a supernova ever made. |
SN 2013fs is asupernova, located in thespiral galaxyNGC 7610, discovered by theIntermediate Palomar Transient Factory sky survey atPalomar Observatory on 6 October 2013 (and originally named iPTF 13dqy).[3] It was discovered approximately three hours from explosion (first light) and was observed inultraviolet andX-ray wavelengths, among others, within several hours.[2] Optical spectra were obtained beginning at six hours from explosion, making these the earliest such detailed observations ever made of a supernova.[2] The supernova was also independently discovered byKōichi Itagaki on 7 October 2013.[3]
The star that produced SN 2013fs was ared supergiant with a mass 10 times the mass of theSun, an effective temperature of 3,500 K, a radius 607[4] times the size of the Sun, and no more than a few million years old when it exploded.[2] The star was surrounded by a relatively dense shell of gas shed by the star within the year before it exploded.[3] Radiation emitted by the supernova explosion illuminated this shell, which had a mass of approximately one-thousandth the mass of the Sun, and its outer fringe was about five times the distance ofNeptune from the Sun.[2]
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