NGC 20

NGC 20 (also known as NGC 6) is a lenticular galaxy in the constellation of Andromeda.

NGC 20
NGC 20 2MASS (infrared)
Observation data
Constellation	Andromeda
Right ascension	00h 09m 32.8s[1]
Declination	+33° 18′ 31″[1]
Redshift	0.016581[2]
Heliocentric radial velocity	4971 ± 49 km/s[2]
Apparent magnitude (V)	14.04[1]
Characteristics
Type	Lenticular
Other designations
NGC 6, NGC 20, UGC 00084, CGCG 498-082, CGCG 499-054, CGCG 0006.9+3303, MCG +05-01-036, 2MASX J00093270+3318310, 2MASXi J0009327+331831, USGC U008 NED04,MAPS-PP O_1257_0037278, PGC 000679, UZC J000932.7+331831, LGG 001:G93 008

The double name of the galaxy is due to the history of its discoveries: for the first time it was discovered on September 18, 1857, by Irish astronomer R. J. Mitchell, an assistant to William Parsons, Lord Rosse; however, the information was not published until Lawrence Parsons, the son of W. Parsons, did so in 1880. Consequently, the galaxy was independently rediscovered by Herman Schultz on October 16, 1866, and by Lewis Swift in 1885. As a result, J. L. E. Dreyer cataloged it twice in the New General Catalogue, as NGC 6 (from Swift's observation) and NGC 20 (from Lord Rosse's).^[3]

NGC 7831 Group

According to A.M. Garcia, NGC 19 is a member of the NGC 7831 group (also known as LGG 1), which contains at least 18 galaxies, including NGC 13, NGC 19, NGC 21, NGC 39 NGC 43, NGC 7805, NGC 7806, NGC 7819, and NGC 7836.^[4]

See also

• NGC 19
• NGC 21
• NGC
• List of NGC objects (1–1000)
• List of NGC objects
• Galaxy