NGC 493


NGC 493, also occasionally referred to as PGC 4979 or GC 281, is a barred spiral galaxy in the constellation Cetus. It is located approximately 90 million light-years from Earth and was discovered on December 20, 1786 by astronomer William Herschel. It was later also observed by his son, John Herschel. John Dreyer, creator of the New General Catalogue, described the galaxy as "very faint, large, much extended 60°" with "a little brighter middle".

Supernovae

Three supernovae have been observed in NGC 493:SN 1971S was discovered by Luisa Pigatto on 15 November 1971.SN 2016hgm was discovered by Mirco Villi and the Catalina Real-time Transient Survey on 19 October 2016.SN 2022ywf was discovered by the Zwicky Transient Facility on 28 October 2022.