Perseus OB1

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Perseus OB1
Double Clusters in Perseus.png
Double cluster at the heart of Per OB1
Credit: Chrisguidry
Observation data
Right ascension 02h 21m[1]
Declination+57° 36′[1]
Mean distance5.9 kly (1.8 kpc)[2]
Span1,000 × 750 light years[3]
Radial velocity−43.4[2] km/s
Physical characteristics
OB stars≥65[5]
Other designationsPer OB1[6]
See also: Stellar association, Moving groups

Perseus OB1 is an OB association in the Northern Celestial Hemisphere in the constellation Perseus. It is centered around the double cluster (NGC 869 and NGC 884),[4] and has lent its name to the Perseus Arm of the Milky Way.[7] The brightest member of the association is the blue supergiant 9 Persei.[3]


  1. ^ a b Sitnik, T. G. (May 2003). "The Line-of-Sight Velocities of OB Associations and Molecular Clouds in a Wide Solar Neighborhood: The Streaming Motions of Stars and Gas in the Perseus Arm". Astronomy Letters. 29: 311–320. Bibcode:2003AstL...29..311S. doi:10.1134/1.1573280.
  2. ^ a b Mel'Nik, A. M.; Dambis, A. K. (2009). "Kinematics of OB-associations and the new reduction of the Hipparcos data". Monthly Notices of the Royal Astronomical Society. 400 (1): 518. arXiv:0909.0618. Bibcode:2009MNRAS.400..518M. doi:10.1111/j.1365-2966.2009.15484.x.
  3. ^ a b Crossen, Craig; Rhemann, Gerald (2012). Sky Vistas: Astronomy for Binoculars and Richest-Field Telescopes. Springer Science & Business Media. p. 93. ISBN 9783709106266.
  4. ^ a b Lee, Hsu-Tai; Lim, Jeremy (June 2008). "On the Formation of Perseus OB1 at High Galactic Latitudes". The Astrophysical Journal. 679 (2): 1352–1363. arXiv:0804.4520. Bibcode:2008ApJ...679.1352L. doi:10.1086/587801.
  5. ^ Beech, Martin; Slawson, Robert W. (December 1995). "Are There Really Blue Stragglers in Per OB1?". Astrophysics and Space Science. 234 (2): 217–221. Bibcode:1995Ap&SS.234..217B. doi:10.1007/BF00627667.
  6. ^ "Per OB1". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-01-15.
  7. ^ Inglis, Michael (2013). Observer’s Guide to Star Clusters. New York, New York: Springer Science & Business Media. p. 184. ISBN 978-1-4614-7567-5.