NGC 206

Coordinates: Sky map 00h 40m 31.3s, +40° 44′ 21″
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NGC 206
NGC 206
Observation data (J2000 epoch)
Right ascension00h 40m 31.3s[1]
Declination+40° 44′ 21″[1]
Apparent dimensions (V)4.2′ (arcmin)
Physical characteristics
RadiusCa. 400 ly
See also: Open cluster, List of open clusters

NGC 206 is a bright star cloud in the Andromeda Galaxy. It is notable for being the brightest star cloud in Andromeda as viewed from Earth.


NGC 206 is the richest and most conspicuous star cloud in the Andromeda Galaxy as well as one of the largest and brightest star formation regions of the Local Group.[2] It contains more than 300 stars brighter than Mb=−3.6.[3] It was originally identified by Edwin Hubble as a star cluster but today, due to its size, it is classified as an OB association.[4]

NGC 206 is located in a spiral arm of the Andromeda Galaxy, in a zone free of neutral hydrogen and has a double structure, with one region that has an age of around 10 million years and includes several H II regions in one of its borders and other with an age of between 40 million years and 50 million years that includes a number of cepheids. Both parts are separated by a band of interstellar dust and include hundreds of stars of spectral type O and B.[5]

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  1. ^ a b "NASA/IPAC Extragalactic Database". Results for NGC 206. Retrieved 25 November 2006.
  2. ^ Massey, Philip; Armandroff, Taft E.; Pyke, Randall; Patel, Kanan; Wilson, Christine D. (1995). "Hot, Luminous Stars in Selected Regions of NGC 6822, M31, and M33". Astronomical Journal. 110: 2715. Bibcode:1995AJ....110.2715M. doi:10.1086/117725.
  3. ^ Hodge, Paul W. (1992). The Andromeda Galaxy. Springer. p. 153.
  4. ^ Hodge, Paul W. (1992). The Andromeda Galaxy. Springer Science & Business Media. p. 20. ISBN 978-0-7923-1654-1.
  5. ^ Chernin, Arthur D.; Efremov, Yury N.; Voinovich, Peter A. (1995). "Superassociations: violent star formation induced by shock-shock collisions". Monthly Notices of the Royal Astronomical Society. 275 (2): 313–326. Bibcode:1995MNRAS.275..313C. doi:10.1093/mnras/275.2.313.

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