|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|
|Estimated age||10 Myr|
|Other designations||NGC 2129, C 0558+233, OCl 467, OCISM 10, KPR2004b 84.|
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.
- List of Messier objects
- List of NGC objects
- List of open clusters
- General Catalogue of Nebulae and Clusters
- "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.
- "NGC 2355 -- Open (galactic) Cluster". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 2010-06-30.
- 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: . doi:10.1111/j.1365-2966.2005.09762.x.