NGC3947 is a barred spiral galaxy in the constellation of Leo. Its velocity with respect to the cosmic microwave background is 6528 ± 23km/s, which corresponds to a Hubble distance of . In addition, three non redshift measurements give a distance of . It was discovered by German-British astronomer William Herschel on 26 April 1785.
NGC 3947 has a supermassive black hole with an estimated mass of 9.4 × 107 M☉.
Supernovae Four supernovae have been observed in NGC3947: SN1972C (type unknown, mag.16) was discovered by Charles Kowal on 18 January 1972. SN2001P (TypeIa, mag.17.5) was discovered by LOTOSS (Lick Observatory and Tenagra Observatory Supernova Searches) on 31 January 2001. SN2006aa (TypeIIn, mag. 18.1) was discovered by the Lick Observatory Supernova Survey (LOSS) on 8 February 2006. SN2013G (TypeIa, mag.16) was discovered by the Catalina Sky Survey on 5 January 2013.
Nearby galaxies NGC 3947 is a member of the NGC 3937 Group, which is part of the Coma Supercluster.
See also List of NGC objects (3001–4000)
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