Copeland Septet Explained

Brightest Member:	NGC 3753
Redshift:	0.0304
Distance:	132Mpc
Other Names:	HCG 57

The Copeland Septet (also Copeland's Septet, Hickson Compact Group 57) is a group of galaxies in the constellation Leo that includes NGC 3748, NGC 3754, NGC 3750, NGC 3751, NGC 3745, NGC 3753 and NGC 3746.^{[1] [2]} The group was discovered by British astronomer Ralph Copeland in 1874. The location of Copeland's Septet is right ascension / declination (2000.0), about three degrees northwest of third magnitude star 93 Leonis.

The redshift of the brightest member, NGC 3753 places Copelands Septet as a part of the Coma Supercluster.^[3]

See also

• Wild's Triplet
• Zwicky's Triplet
• Robert's Quartet
• 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

Notes and References

1. Web site: NAME COPELAND SEPTET . 12 October 2018.
2. Book: Bakich . Michael E. . 1,001 Celestial Wonders to See Before You Die: The Best Sky Objects for Star Gazers . July 10, 2010 . . 9781441917775 . 72 . 12 October 2018.
3. Jaffe . W. . Gavazzi . G. . 1986-02-01 . Radio continuum survey of the coma/A1367 supercluster. II. 1.5 GHz observations of 396 CGCG galaxies. . The Astronomical Journal . 91 . 204–216 . 10.1086/114001 . 0004-6256.