 A small region at the heart of Omega Centauri, containing some 50,000 stars (NASA/STScI) Omega Centauri or NGC 5139 is defined as a globular cluster of stars orbiting our galaxy, the Milky Way. It is the largest globular cluster associated with the Milky Way that has been discovered to date, and is one of the few that can be seen with the naked eye. Omega Centauri is located about 17,000 light years from Earth and contains several million Population II stars. It is about 12 billion years old.
NGC5139 is located at 13:26.8 right ascension, -47:29 declination, with an apparent magnitude of 3.68, and covering 36.3' of sky. It is in the constellation Centaurus.
With more observations, it has been found that Omega Centauri is not like other globular clusters, in that it has several generations of stars. Laura Stanford, a graduate student in the Australian National Universitys Research School of Astronomy and Astrophysics who conducted a study of Omega Centauri's stars, speculates that it is actually the core of a dwarf galaxy several hundred times its present size, which was ripped apart and absorbed by our Milky Way galaxy.
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