NGC 4839

NGC 4839 is a lenticular type-cD galaxy located within the rich Coma Cluster of galaxies.^[1] The galaxy is part of the NGC 4839 galaxy group of which it is the brightest galaxy.^[3]

NGC 4839
The cD galaxy NGC 4839.
Observation data (J2000 epoch)
Constellation	Coma Berenices
Right ascension	12h 57m 24.361s
Declination	+27° 29′ 52.14″
Redshift	0.02448
Heliocentric radial velocity	7913 km/s
Distance	380.7 Mly (116.71 Mpc)[1]
Apparent magnitude (B)	13.02 [2]
Characteristics
Type	cD; SA0[1]
Size	350,000 ly (107.36 kpc) (estimated)[1]
Other designations
2MASX J12572435+2729517, UGC 8070, MCG -05-31-025, PGC 44298, CGCG 160-039[2]

The NGC 4839 group appears to be merging with the Coma cluster.^[3] However it is unclear if the group is on its initial infall or if it has passed through the cluster once already.^[3] A 2023 paper argued that the distribution of globular clusters within the galaxy supported the galaxy being on its second infall.^[3]

NGC 4839 was discovered on April 11, 1785, by William Herschel, but also observed by John Herschel on April 19, 1827, and by Heinrich d'Arrest on May 18, 1862.^[4] It is classified as a radio galaxy presenting radio waves.^[1]