NGC 869-884, Double Cluster

The Double Cluster is the common name for the naked-eye open clusters NGC 869 and NGC 884 which are close together in the constellation Perseus. NGC 869 and NGC 884 both lie at a distance of 7500 light years. NGC 869 has a mass of 3700 solar masses and NGC 884 weighs in at 2800 solar masses; however, later research has shown both clusters are surrounded with a very extensive halo of stars, with a total mass for the complex of at least 20,000 solar masses. Read more.

Name and aliases	NGC 869	NGC 884
Common names	h Per Cluster, h Persei Cluster	chi Per Cluster, chi Persei Cluster, khi Per Cluster
Type	Open (galactic) Cluster	Open (galactic) Cluster
Coordinates	02:18:57.84 +57:08:02.4	02:22:20.16 +57:08:56.4
Radial velocity	-38.9 km/s	-43.5 km/s
Link	Simbad	Simbad
Link	HyperLeda	HyperLeda

Double cluster