Robert's Quartet

Robert's Quartet or AM 0018–0485 is the name given to the gravitationally interacting group of galaxies NGC 87, NGC 88, NGC 89, and NGC 92 by Halton Arp, who compiled A Catalogue of Southern Peculiar Galaxies and Associations (1987).

See also

• http://www.asnsw.com/universe/2001/wian-0901.htm