NGC 20

Last updated
NGC 20
NGC 0020 2MASS.jpg
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

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

Contents

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 20 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

References

  1. 1 2 3 "NGC 20". SIMBAD. Retrieved 2025-06-24.
  2. 1 2 "NASA/IPAC Extragalactic Database". Results for NGC 0020. Retrieved 2010-05-05.
  3. ↑ Steinicke, W. (2010). Observing and Cataloguing Nebulae and Star Clusters: From Herschel to Dreyer's New General Catalogue. Cambridge University Press. pp. 288–289, 301–302. ISBN   978-1-139-49010-8 . Retrieved 2025-06-24.
  4. ↑ Garcia, A. M. (1993). "General study of group membership. II. Determination of nearby groups". Astronomy and Astrophysics Supplement Series. 100: 47. Bibcode:1993A&AS..100...47G.
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