NGC 2939 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, 13 non-redshift measurements give a closer mean distance of . It was discovered by German-British astronomer William Herschel on 18 January 1784.
NGC 2939 is a radio galaxy, i.e. it has giant regions of radio emission extending well beyond its visible structure.
NGC 2911 group NGC 2939 is a member of the NGC 2911 group (also known as LGG 177). This group contains 7 galaxies, including NGC 2911, , , , , and PGC 27167.
Supernovae Two supernovae have been observed in NGC 2939: SN 2009ao (TypeII-P, mag. 16.3) was discovered by The CHilean Automatic Supernova sEarch (CHASE) on 4 March 2009. SN 2011cf (TypeII, mag. 18.2) was discovered by the Lick Observatory Supernova Search (LOSS) on 28 April 2011.
See also List of NGC objects (2001–3000)
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