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

open cluster comparison table

Subject	has purpose	has radial velocity	has note	has number of star	is an instance of	has synonym	has image	has definition	has distance	has age	has composition	has Messier number
alpha Persei cluster					open cluster			A young open cluster with a high mean rotational velocity.		varies widely
Coma open cluster				100	open cluster			Open cluster similar to the Hyades in overall binary frequency.	80 pc	varies widely
Hyades		+ 36 km s-1	Aldebaran is a foreground star in that region of the sky, it is not a member of the Hyades.	200	naked eye object				40 pc	5 × 108 yr	spectral types A1-K
NGC 1818					open cluster				164000 light years	varies widely
NGC 1850					open cluster				66000 light years	varies widely
Pleiades	originally to catalog all objects which could be confused with a comet			several hundred	Messier object	NGC 1432			125 pc	very young	B star, late star	45
Praesepe	originally to catalog all objects which could be confused with a comet				naked eye object	NGC 2632			160 pc	varies widely		44

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