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Omega Centauri (ω Cen, NGC 5139, or Caldwell 80) is a globular cluster in the constellation of Centaurus that was first identified as a non-stellar object by Edmond Halley in 1677. Located at a distance of 17,090 light-years (5,240 parsecs ), it is the largest known globular cluster in the Milky Way at a diameter of roughly 150 light-years. [ 10 ]
Omega Centauri, one of the largest star clusters. Below is a list of the largest known star clusters , ordered by diameter in light years , above the size of 50 light years in diameter. This list includes globular clusters , open clusters , super star clusters , and other types.
Omega Centauri contains several million stars, most of which are yellow dwarf stars, but also possesses red giants and blue-white stars; the stars have an average age of 12 billion years. This has prompted suspicion that Omega Centauri was the core of a dwarf galaxy that had been absorbed by the Milky Way.
1.6 Em – 172 ± 12.5 light-years – diameter of Omega Centauri (one of the largest-known globular clusters, perhaps containing over a million stars) [199] [200] 3.08568 Em – 326.1 light-years – 1 hectoparsec; 3.1 Em – 310 light-years – distance to Canopus according to Hipparcos [201]
Centaurus A is located approximately 4° north of Omega Centauri (a globular cluster visible with the naked eye). [14] Because the galaxy has a high surface brightness and relatively large angular size, it is an ideal target for amateur astronomy observations.
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Fimbulthul is a tidal stellar stream torn off from Omega Centauri, the largest globular cluster of our Milky Way galaxy. The stream contains 309 known stars stretching over 18° in the constellations of Hydra and Centaurus , matching the same age as the globular cluster.