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The Copeland Septet (also Copeland's Septet, Hickson Compact Group 57) is a
The Copeland Septet (also Copeland's Septet, Hickson Compact Group 57) is a group of galaxies
A galaxy group or group of galaxies (GrG) is an aggregation of galaxies comprising about 50 or fewer gravitationally bound members, each at least as luminous as the Milky Way (about 1010 times the luminosity of the Sun); collections of galaxies ...
in the constellation Leo that includes NGC 3748, NGC 3754, NGC 3750
NGC commonly refers to:
* New General Catalogue of Nebulae and Clusters of Stars, a catalogue of deep sky objects in astronomy
NGC may also refer to:
Companies
* NGC Corporation, name of US electric company Dynegy, Inc. from 1995 to 1998
* Nat ...
, NGC 3751, NGC 3745, NGC 3753 and NGC 3746. The group was discovered by British astronomer Ralph Copeland
Ralph Copeland FRSE FRAS (3 September 1837 – 27 October 1905) was an English astronomer and the third Astronomer Royal for Scotland.
Life
Copeland was born at Moorside Farm, near Woodplumpton in Lancashire, England the son of Robert Copela ...
in 1874. The location of Copeland's Septet is right ascension / declination (2000.0), about three degrees northwest of third magnitude star 93 Leonis.
See also
* Wild's Triplet * Zwicky's Triplet *Robert's Quartet
Robert's Quartet is a compact galaxy group approximately 160 million light-years away in the constellation Phoenix. It is a family of four very different galaxies whose proximity to each other has caused the creation of about 200 star-forming ...
* Stephan's Quintet and NGC 7331 Group (also known as the ''Deer Lick Group'' located about half a degree northeast of Stephan's Quintet)
* Seyfert's Sextet
References
Leo (constellation) 57 {{galaxy-cluster-stub