IC 4397

IC 4397 is a spiral galaxy in the constellation of Boötes. Its velocity with respect to the cosmic microwave background is 4,627±16 km/s, which corresponds to a Hubble distance of 222.6 ± 15.6 Mly (68.25 ± 4.78 Mpc).^[1] It was discovered by French astronomer Guillaume Bigourdan on 23 June 1889.^[2]

ConstellationBoötes

Right ascension14^h 17^m 58.7102^s[1]

Declination+26° 24′ 45.889″^[1]

Redshift0.014744±0.0000200^[1]

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

IC 4397
IC 4397 imaged by SDSS
Observation data (J2000 epoch)
Constellation	Boötes
Right ascension	14h 17m 58.7102s[1]
Declination	+26° 24′ 45.889″[1]
Redshift	0.014744±0.0000200[1]
Heliocentric radial velocity	4,420±6 km/s[1]
Distance	222.6 ± 15.6 Mly (68.25 ± 4.78 Mpc)[1]
Group or cluster	NGC 5653 group (LGG 383)
Apparent magnitude (V)	14.14[1]
Characteristics
Type	S[1]
Size	~103,500 ly (31.72 kpc) (estimated)[1]
Apparent size (V)	1.1′ × 0.9′[1]
Other designations
IRAS 14156+2638, 2MASS J14175870+2624454, UGC 9150, MCG +05-34-012, Mrk 1510, PGC 51073, CGCG 163-018[1]

Close

IC 4397 has an active galactic nucleus, i.e. it has a compact region at the center of a galaxy that emits a significant amount of energy across the electromagnetic spectrum, with characteristics indicating that this luminosity is not produced by the stars.^[3][4] It is a Seyfert II galaxy, i.e. it has a quasar-like nucleus with very high surface brightness, whose spectra reveal strong, high-ionisation emission lines, but unlike quasars, the host galaxy is clearly detectable.^[1] The nucleus also shines brightly in the ultraviolet. IC 4397 is listed in the Markarian catalogue as Mrk 1510.^[5]