| Robert's Quartet |
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Information AboutRobert's Quartet |
Robert's Quartet is a compact Galaxy Group approximately 160 million Light-year s away in the Constellation Phoenix . It is a family of four very different Galaxies in the prosses of Colliding And Merging . Its members are NGC 87 , NGC 88 , NGC 89 and NGC 92 , discovered by John Herschel in the 1830 s. 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 Arp and Barry F. Madore , who compiled 1987 . MEMBERS EXTERNAL LINKS |
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