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SN 2013fs
SN 2013fs is a supernova, located in the spiral galaxy NGC 7610, discovered by the Intermediate Palomar Transient Factory sky survey at Palomar Observatory on 6 October 2013 (and originally named iPTF 13dqy).[3] It was discovered approximately three hours from explosion (first light) and was observed in ultraviolet and X-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 by Kōichi Itagaki on 7 October 2013.[3] The star that produced SN 2013fs was a red supergiant with a mass 10 times the mass of the Sun, 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 of Neptune from the Sun.[2] References
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