NGC 869
The Double Cluster, NGC 869 (right) and NGC 884 (left) with north to the top
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| Object type |
Open cluster 
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|---|---|
| Other designations |
Collinder 24, Melotte 13, |
| Constellation | Perseus |
| 02h 19.1m | |
| Declination | +57° 09′ |
| Distance | 7.6 kly / 2.3 kpc |
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In visual light (V) |
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| 3.7 | |
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Size
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30′ |
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| Mass | - M☉ |
| Radius | - |
| Estimated age | 13 My |
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Notable features
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- |
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[]
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Collinder 24, Melotte 13,
NGC 869 is an open cluster located 7600 light years away in the constellation of Perseus. The cluster is most likely around 13 million years old. It is the westernmost of the Double Cluster with NGC 884. NGC 869 and 884 are often designated h and χ Persei, respectively. Located in the Perseus OB1 association both clusters are located physically close to one another, only a few hundred light years apart. The clusters were first recorded by Hipparchus, but have likely been known since antiquity.
The Double Cluster is a favorite of amateur astronomers. These bright clusters are often photographed or observed with small telescopes. Easy to find, the clusters are visible with the unaided eye between the constellations of Perseus and Cassiopeia as a brighter patch in the winter Milky Way.
In small telescopes the cluster appears as an assemblage of bright stars located in a rich star field. Dominated by bright blue stars the cluster also hosts a few orange stars that add to the visual interest.
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Wikipedia