Ruud de Vries - Dutch Backyard Astrophotography

Fighting light pollution.....

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 02:19:00.00 +57:07:41.9 02:22:22.99 +57:07:30.0
Radial velocity -38.9 km/s -44.7 km/s
Magnitude 5.3 (V) 6.1 (V)
Size 18.0 (arcminutes) 18.0 (arcminutes)
Link Simbad Simbad
Link HyperLeda HyperLeda

Double cluster

TS 90/600
Atik one 6.0
Skywatcher AZ-EQ5 PRO
Guiding camera
Starlight Xpress Lodestar
TS 2" Off Axis Guider
11 * 300sec RGB