Fighting light pollution.....
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