NGC 3947

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 was discovered by Charles Kowal on 18 January 1972.
SN2001P was discovered by LOTOSS on 31 January 2001.
SN2006aa was discovered by the Lick Observatory Supernova Survey on 8 February 2006.
SN2013G 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.