- Robert's Quartet
name = Robert's Quartet
constellation = Phoenix
member_no = 4
other_names = AM 0018-0485
Robert's Quartet is a compact
galaxy groupapproximately 160 million light-years away in the constellationPhoenix. It is a family of four very different galaxiesin the process of colliding and merging. Its members are NGC 87, NGC 88, NGC 89and NGC 92, discovered by John Herschelin the 1830s.
The quartet is one of the finest examples of compact groups of galaxies. Because such groups contain four to eight galaxies in a very small region, they are excellent laboratories for the study of galaxy interactions and their effects, in particular on the formation of stars. The quartet has a total visual magnitude of almost 13. The brightest member of the group has a magnitude of about 14. On the sky, the four galaxies are all within a circle of radius of 1.6 arcmin, corresponding to about 75,000 light-years. It was named by
Halton Arpand Barry F. Madore, who compiled "A Catalogue of Southern Peculiar Galaxies and Associations" in 1987.
* [http://www.eso.org/outreach/press-rel/pr-2005/phot-34-05.html ESo: Cosmic Portrait of a Perturbed Family]
* [http://www.asnsw.com/universe/2001/wian-0901.htm "What's In A Name?"]
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