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]
| NGC 2129 | |
|---|---|
SDSS image of 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 | |
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]
New General Catalogue 2000 to 2499 | |
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