NGC 3947
Galaxy in the constellation Leo
From Wikipedia, the free encyclopedia
NGC 3947 is a barred spiral galaxy in the constellation of Leo. Its velocity with respect to the cosmic microwave background is 6528 ± 23 km/s, which corresponds to a Hubble distance of 314.0 ± 22.0 Mly (96.28 ± 6.75 Mpc).[1] In addition, three non redshift measurements give a distance of 284.67 ± 12.90 Mly (87.28 ± 3.956 Mpc).[2] It was discovered by German-British astronomer William Herschel on 26 April 1785.[3]
| NGC 3947 | |
|---|---|
NGC 3947 imaged by SDSS | |
| Observation data (J2000 epoch) | |
| Constellation | Leo |
| Right ascension | 11h 53m 20.3285s[1] |
| Declination | +20° 45′ 06.049″[1] |
| Redshift | 0.020698[1] |
| Heliocentric radial velocity | 6205 ± 2 km/s[1] |
| Distance | 314.0 ± 22.0 Mly (96.28 ± 6.75 Mpc)[1] |
| Group or cluster | NGC 3937 Group |
| Apparent magnitude (V) | 13.2[1] |
| Characteristics | |
| Type | (R)SB(rs)b[1] |
| Size | ~153,100 ly (46.93 kpc) (estimated)[1] |
| Apparent size (V) | 1.4′ × 1.2′[1] |
| Other designations | |
| IRAS 11507+2101, 2MASX J11532031+2045055, UGC 6863, MCG +04-28-088, PGC 37264, CGCG 127-095[1] | |
NGC 3947 has a supermassive black hole with an estimated mass of 9.4 × 107 M☉.[4]
Supernovae
Four supernovae have been observed in NGC 3947:
- SN 1972C (type unknown, mag. 16)[5] was discovered by Charles Kowal on 18 January 1972.[6]
- SN 2001P (Type Ia, mag. 17.5) was discovered by LOTOSS (Lick Observatory and Tenagra Observatory Supernova Searches) on 31 January 2001.[7][8]
- SN 2006aa (Type IIn, mag. 18.1) was discovered by the Lick Observatory Supernova Survey (LOSS) on 8 February 2006.[9][10]
- SN 2013G (Type Ia, mag. 16) was discovered by the Catalina Sky Survey on 5 January 2013.[11][12]
Nearby galaxies
NGC 3947 is a member of the NGC 3937 Group,[13][14] which is part of the Coma Supercluster.[13]
