NGC 2129

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: 06^h 01^m 06.00^s, +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]

See also

• List of Messier objects
• List of NGC objects
• List of open clusters
• General Catalogue of Nebulae and Clusters

References

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. http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC+2129&extend=no&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES. Retrieved 2010-06-30. 
2. ^ ^{a b c d} "NGC 2355 -- Open (galactic) Cluster". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+2129. Retrieved 2010-06-30. 
3. ^ ^{a b c d e} Carraro, Giovanni; Chaboyer, Brian; Perencevich, James (January 2006). "The young open cluster NGC 2129" (PDF). Royal Astronomical Society, 365 (8,): pp. 867–873. arXiv:astro-ph/0510573. Bibcode 2006MNRAS.365..867C. doi:10.1111/j.1365-2966.2005.09762.x. 

External links

• NASA/IPAC Extragalactic Database (NED): NGC 2129
• NGC 2129 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images