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NGC 2129
SDSS image of NGC 2129
Observation data (J2000 epoch)
Right ascension	06 01 06.5
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. 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.

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.

See also

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

References

1. ^ "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. ^ "NGC 2129". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-06-30.
3. ^ 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.

External links

• Media related to NGC 2129 at Wikimedia Commons
• 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

v t e Constellation of Gemini
List of stars in Gemini Gemini in Chinese astronomy
Stars	Bayer α (Castor) β (Pollux) γ (Alhena) δ (Wasat) ε (Mebsuta) ζ (Mekbuda) η (Propus) θ ι κ λ μ (Tejat) ν ξ (Alzirr) ο (Jishui) π ρ σ τ υ φ χ ω Flamsteed 1 3 6 25 30 37 38 (e) 57 (A) 64 (b) 65 (b) 74 (f) 81 (g) Variable R U TV BG DM DN OU WY V429 HR 2877 HD 44780 50554 63433 260655 Other 2MASS 0727+1710 CXOU J061705.3+222127 Geminga Gliese 251 HAT-P-20 HAT-P-24 HAT-P-33 LB-1 PSR J0659+1414 WD J0651+2844 WISEP J060738.65+242953.4
Exoplanets HAT-P-24b HAT-P-50b HD 50554 b HD 59686 Ab Pollux b τ Geminorum b
Star clusters	NGC 2129 2158 2266 2277 2355 2420 Other Koposov 2 Messier 35
Nebulae IC 443 IC 444 Medusa Nebula NGC 2371-2 NGC 2392
Galaxies	NGC 2291 2294 2357 Other 2MASX J07322028+3138009 IC 485 PKS 0735+178
Astronomical events GRB 070125
Category

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