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 <var>M</var>_☉.

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)

References

External links