NGC 4172

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).^[1] Additionally, 11 non-redshift measurements give a closer mean distance of 431.86 ± 14.35 Mly (132.409 ± 4.400 Mpc).^[2] It was discovered by German-British astronomer William Herschel on 14 April 1789.^[3]

ConstellationUrsa Major

Right ascension12^h 12^m 14.9210^s[1]

Declination+56° 10′ 39.053″^[1]

Redshift0.030983±0.00000344^[1]

Quick facts Observation data (J2000 epoch), Constellation ...

NGC 4172
NGC 4172 imaged by SDSS
Observation data (J2000 epoch)
Constellation	Ursa Major
Right ascension	12h 12m 14.9210s[1]
Declination	+56° 10′ 39.053″[1]
Redshift	0.030983±0.00000344[1]
Heliocentric radial velocity	9,289±1 km/s[1]
Distance	431.86 ± 14.35 Mly (132.409 ± 4.400 Mpc)[1]
Apparent magnitude (V)	13.9g[1]
Characteristics
Type	S[1]
Size	~184,400 ly (56.55 kpc) (estimated)[1]
Apparent size (V)	1.04′ × 0.98′[1]
Other designations
2MASX J12121490+5610386, UGC 7205, MCG +09-20-109, PGC 38887, CGCG 269-039[1]

Close

NGC 4172 is a LINER galaxy, i.e. a galaxy whose nucleus has an emission spectrum characterized by broad lines of weakly ionized atoms.^[4][5]