NGC 2129

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NGC 2129
Observation data (J2000 epoch)
Constellation Gemini
Right ascension 06h 01m 06.5s[1][2]
Declination +23° 10′ 20″[1][2]
Distance 7,200 ly (2,200 pc[3])
Apparent magnitude (V) 6.7 [2]
Apparent dimensions (V) 2.5 MOA[3]
Physical characteristics
Radius 5.2
Estimated age 10 Myr
Other designations NGC 2129, C 0558+233, OCl 467, OCISM 10, KPR2004b 84.[2]
See also: Open cluster, List of open clusters

Coordinates: Sky map 06h 01m 06.00s, +23° 19′ 00″

NGC 2129 is an open cluster in the constellation Gemini. It has an angular distance of 2.5 arcminutes and is approximately 2.2 ± 0.2 kpc (~7,200 light years) from the Sun inside the Local spiral arm.[3] At that distance, the angular size of the cluster corresponds to a diameter of about 10.4 light years. NGC 2129 is a very young cluster whose age has been estimated at 10 million years.[3]

The group is dominated by two close B-Type stars, HD 250289 (B2III) and HD 250290 (B3I). With the two stars sharing the same proper motion and radial velocity it is likely that the two constitute a binary system.[3]

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  1. ^ a b "NED results for object NGC 2129". NASA/IPAC Extragalactic Database. Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. Retrieved 2010-06-30. 
  2. ^ a b c d "NGC 2355 -- Open (galactic) Cluster". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 2010-06-30. 
  3. ^ a b c d e Carraro, Giovanni; Chaboyer, Brian; Perencevich, James (January 2006). "The young open cluster NGC 2129". Royal Astronomical Society. 365 (8): 867–873. Bibcode:2006MNRAS.365..867C. arXiv:astro-ph/0510573Freely accessible. doi:10.1111/j.1365-2966.2005.09762.x. 

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