NGC 884

NGC 884
The Double Cluster, NGC 869 (top) and NGC 884 (bottom) with north to the left
Observation data (J2000 epoch)
Constellation	Perseus
Right ascension	02h 22.0m
Declination	+57° 08′
Distance	7.6 kly (2.3 kpc)
Apparent magnitude (V)	3.8
Apparent dimensions (V)	30′
Physical characteristics
Estimated age	12.5 My
Other designations	Caldwell 14, Collinder 25, Melotte 14, Raab 10, OCl 353, Chi Per Cluster, χ Persei
See also: Open cluster, List of open clusters

NGC 884 is an open cluster located 7600 light years away in the constellation of Perseus. It is the easternmost of the Double Cluster with NGC 869. NGC 869 and 884 are often designated h and χ Persei, respectively. The cluster is most likely around 12.5 million years old. 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. The Double Cluster was also included in the Caldwell catalogue, a catalogue of astronomical objects for amateur observation.

In small telescopes the cluster appears as a beautiful 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. Both clusters together offer a spectacular low magnification view.