| Double Cluster | |
|---|---|
 | |
| Observation data (J2000.0 epoch) | |
| Right ascension | 2h 20m |
| Declination | 57° 08′ |
| Distance | 7,460 and 7,640ly[1] (2,290 and 2340pc[1]) |
| Apparent magnitude (V) | 3.7 and 3.8 |
| Apparent dimensions (V) | 60′ |
| Physical characteristics | |
| Other designations | Caldwell 14 |
| Associations | |
| Constellation | Perseus |
The Double Cluster (also known as Caldwell 14) consists of the open clusters NGC 869 and NGC 884 (often designated h Persei and χ (chi) Persei, respectively), which are close together in the constellation Perseus. Both visible with the naked eye, NGC 869 and NGC 884 lie at a distance of about 7,500 light years in the Perseus Arm of the Milky Way galaxy.[2]
- ^ a b Currie, Thayne; Hernandez, Jesus; Irwin, Jonathan; Kenyon, Scott J.; Tokarz, Susan; Balog, Zoltan; Bragg, Ann; Berlind, Perry; Calkins, Mike (2010). "The Stellar Population of h and χ Persei: Cluster properties, membership, and the intrinsic colors and temperatures of stars". The Astrophysical Journal Supplement. 186 (2): 191. arXiv:0911.5514. Bibcode:2010ApJS..186..191C. doi:10.1088/0067-0049/186/2/191. S2CID 16454332.
- ^ Keller, Stefan C.; Grebel, Eva K.; Miller, Grant J.; Yoss, Kenneth M. (2001). "UBVI and Hα photometry of the h and χ Persei cluster". The Astronomical Journal. 122 (1): 248. arXiv:astro-ph/0104179. Bibcode:2001AJ....122..248K. doi:10.1086/321139.