NGC 3389

NGC 3389 is a spiral galaxy in the constellation of Leo. Its velocity with respect to the cosmic microwave background is 1,651±24 km/s, which corresponds to a Hubble distance of 79.4 ± 5.7 Mly (24.35 ± 1.74 Mpc).^[1] However, 24 non-redshift measurements give a closer mean distance of 71.70 ± 3.01 Mly (21.983 ± 0.924 Mpc).^[2] It was discovered by German-British astronomer William Herschel on 11 March 1784.^[3] It was also observed by John Herschel on 23 March 1830, causing it to be listed a second time in the New General Catalogue as NGC 3373.^[3]

NGC 3389
NGC 3389 imaged by SDSS
Observation data (J2000 epoch)
Constellation	Leo
Right ascension	10h 48m 27.9204s[1]
Declination	+12° 31′ 59.897″[1]
Redshift	0.004346±0.000007[1]
Heliocentric radial velocity	1,303±2 km/s[1]
Distance	71.70 ± 3.01 Mly (21.983 ± 0.924 Mpc)[1]
Group or cluster	HOLM 212, NGC 3338 Group (LGG 214)
Apparent magnitude (V)	12.3B[1]
Characteristics
Type	SA(s)c[1]
Size	~81,000 ly (24.83 kpc) (estimated)[1]
Apparent size (V)	2.8′ × 1.3′[1]
Other designations
HOLM 212C, NGC 3373, UGC 5914, MCG +02-28-013, PGC 32306, CGCG 066-022[1]

Holm 212 and NGC 3338 groups

NGC 3389, Messier 105, and NGC 3384 are listed together as Holm 212 in Erik Holmberg's A Study of Double and Multiple Galaxies Together with Inquiries into some General Metagalactic Problems, published in 1937.^[4]

According to A. M. Garcia, NGC 3389 is a member of the NGC 3338 Group (also known as LGG 214). In addition to NGC 3338, this galaxy group includes at least 4 other galaxies: NGC 3346, UGC 5832, PGC 31933, and MRK 1263.^[5]

Supernovae

Two supernovae have been observed in NGC 3389.

• SN 1967C (Type Ia, mag. 13) was discovered by A. D. Chuadze on 28 February 1967, and independently discovered by Miklós Lovas on 10 March 1967.^{[6][7][8][9][10]}
• SN 2009md (Type II, mag. 16.5) was discovered by Kōichi Itagaki on 4 December 2009.^[11][12]

See also

• List of NGC objects (3001–4000)