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physical object > natural object > celestial body > collection of stars > collection of galaxies > galaxy cluster > galaxy group > compact group

compact group
subject			fact

compact group	has number of galaxies < 10
	has definition Galaxy group with a few galaxies separated by a few galaxy diameters.
	is a kind of galaxy group
collection of stars	has number of stars
	has catalog catalog about star systems
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 compact group :

• Seyfert's Sextet (5 facts) - A compact group of galaxies surrounding NGC 6027. It has both spiral and irregular members.
• Stephan's Quartet (2 facts)
• Stephan's Quintet (4 facts) - A highly disturbed cluster of five peculiar galaxies (NGC 7317, NGC 7318A, NGC 7318B, NGC 7319, NGC 7320) in Pegasus which seem to exhibit gaseous connecting bridges. Four have large redshifts (of the order of 5700-6700 km s^-1), but the fifth member (NGC 7320) has a much smaller redshift (800 km s^-1). Discovered in 1877 by M. E. Stephan.