NGC 4172
| NGC 4172 | |
|---|---|
NGC 4172 imaged by SDSS | |
| Observation data (J2000 epoch) | |
| Constellation | Ursa Major |
| Right ascension | 12h 12m 14.9210s |
| Declination | +56° 10′ 39.053″ |
| Redshift | 0.030983±0.00000344 |
| Heliocentric radial velocity | 9,289±1 km/s |
| Distance | 431.86 ± 14.35 Mly (132.409 ± 4.400 Mpc) |
| Apparent magnitude (V) | 13.9g |
| Characteristics | |
| Type | S |
| Size | ~184,400 ly (56.55 kpc) (estimated) |
| Apparent size (V) | 1.04′ × 0.98′ |
| Other designations | |
| 2MASX J12121490+5610386, UGC 7205, MCG +09-20-109, PGC 38887, CGCG 269-039 | |
NGC 4172 is a spiral galaxy in the constellation of Ursa Major. Its velocity with respect to the cosmic microwave background is 9,449±11 km/s, which corresponds to a Hubble distance of 454.6 ± 31.8 Mly (139.37 ± 9.76 Mpc). Additionally, 11 non-redshift measurements give a closer mean distance of 431.86 ± 14.35 Mly (132.409 ± 4.400 Mpc). It was discovered by German-British astronomer William Herschel on 14 April 1789.
NGC 4172 is a LINER galaxy, i.e. a galaxy whose nucleus has an emission spectrum characterized by broad lines of weakly ionized atoms.