NGC 3389

NGC3389 is a spiral galaxy in the constellation of Leo. Its velocity with respect to the cosmic microwave background is, which corresponds to a Hubble distance of. However, 24 non-redshift measurements give a closer mean distance of. It was discovered by German-British astronomer William Herschel on 11 March 1784. 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.

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.
According to A. M. Garcia, NGC 3389 is a member of the NGC 3338 Group. In addition to NGC 3338, this galaxy group includes at least three other galaxies: NGC 3346, UGC 5832, and MRK 1263.

Supernovae

Two supernovae have been observed in NGC 3389.

SN1967C was discovered by A. D. Chuadze on 28 February 1967, and independently discovered by Miklós Lovas on 10 March 1967.
SN2009md was discovered by Kōichi Itagaki on 4 December 2009.