en NGC 2129

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

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]

References

^ ^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.
^ ^a ^b ^c ^d "NGC 2129". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-06-30.
^ ^a ^b ^c ^d ^e Carraro, Giovanni; Chaboyer, Brian; Perencevich, James (January 2006). "The young open cluster NGC 2129". Monthly Notices of the Royal Astronomical Society. 365 (8): 867–873. arXiv:astro-ph/0510573. Bibcode:2006MNRAS.365..867C. doi:10.1111/j.1365-2966.2005.09762.x. S2CID 15621721.