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physical object > natural object > celestial body > collection of stars > collection of galaxies > galaxy cluster > galaxy group > compact group
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compact group comparison table
Subject has number of galaxie has definition is part of has brightest member
Seyfert's Sextet6A compact group of galaxies surrounding NGC 6027. It has both spiral and irregular members.SerpensNGC 6027
Stephan's Quartet4   
Stephan's Quintet5A 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.Pegasus 

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