NGC 5806
NGC 5806 is an intermediate spiral galaxy in the constellation Virgo. It was discovered by German-British astronomer William Herschel on 24 February 1786. It is located about 70 million light-years away from the Milky Way. It is a member of the NGC 5846 Group.
Supernovae and Imposter
Three supernovae and one supernova imposter have been observed in NGC 5806:- SN 2004dg was discovered by Associazione Ternana Astrofili on 19 July 2004. The progenitor of SN 2004dg has not been detected and is expected to have been a relatively low mass, low luminosity, red supergiant.
- SN 2012P was discovered by Fabio Briganti on 22 January 2012. Originally classified as a Type [Ib and Ic supernovae|TypeIb/c], it was later determined to be Type IIb. Later analysis concluded that the progenitor had an initial mass of 15.2.
- iPTF13bvn was discovered by the Palomar [Transient Factory] on 16 June 2013.
- SN Hunt 248 was discovered by the Catalina Real-time Transient Survey and Stan Howerton on 21 May 2014. It was initially catalogued as a supernova, but was later classified as a supernova imposter. The progenitor was detected as a cool hypergiant with an absolute visual magnitude of −9 and 400,000 times more luminous than the sun. The eruption saw it increase in luminosity to around. Later analysis concluded that this object is a luminous red nova.