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physical object > natural object > celestial body > collection of stars > star cluster > open cluster

open cluster
subject			fact

open cluster	has age varies widely
	is a part of disk
	has catalog open cluster catalog
	has definition A small, loose cluster of stars that typically contains several hundred members. The best examples are the Hyades and the Pleiades, both in the constellation Taurus. Open clusters line the Galactic plane, in contrast with globular clusters, which are members of the Galaxy's halo or thick disk.
	has definition A comparatively loose grouping (mass range 102-103 M)sun of Population I stars, strongly concentrated in the spiral arms or the disk of the Galaxy (in fact, open clusters give a good indication of where the spiral arms are). Unlike associations, open clusters are dynamically stable. Depending on their age, stars in open clusters "peel off" from the main sequence at different points (the higher the turnoff point, the younger the cluster). (Sometimes called Galactic cluster; NGC 188 is the oldest known open cluster.)
	is a kind of star cluster
collection of stars	has number of stars
celestial body	has spectra
physical object	has location or center of gravity
	has angular momentum
	has mass
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

Kinds of open cluster :

• alpha Persei cluster (3 facts) - A young open cluster with a high mean rotational velocity.
• Coma open cluster (6 facts) - Open cluster similar to the Hyades in overall binary frequency.
• Hyades (9 facts)
• NGC 1818 (4 facts)
• NGC 1850 (4 facts)
• Pleiades (11 facts) (M 45, NGC 1432)
• Praesepe (9 facts) (Beehive Cluster, M 44, NGC 2632)

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