The internal dynamics have been analyzed using measurements of the radial velocities of 469 stars. The stars in the core of Omega Centauri are so crowded that they are estimated to average only 0.1 light-year away from each other. Orbiting through the Milky Way, Omega Centauri contains several million Population II stars and is about 12 billion years old. Of all the globular clusters in the Local Group of galaxies, only Mayall II in the Andromeda Galaxy is brighter and more massive. It is the brightest, largest and, at 4 million solar masses, the most massive-known globular cluster associated with the Milky Way. #BLACK OMEGA VS LIGHTS FULL#Properties Īt a distance of about 17,090 light-years (5,240 parsecs) from Earth, Omega Centauri is one of the few globular clusters visible to the naked eye-and appears almost as large as the full Moon when seen from a dark, rural area. It was first recognized as a globular cluster by Scottish astronomer James Dunlop in 1826, who described it as a "beautiful globe of stars very gradually and moderately compressed to the centre". Swiss astronomer Jean-Philippe de Cheseaux included Omega Centauri in his 1746 list of 21 nebulae, as did French astronomer Lacaille in 1755, whence the catalogue number is designated L I.5. In 1716, it was published by Halley among his list of six "luminous spots or patches" in the Philosophical Transactions of the Royal Society. Using a telescope from the South Atlantic island of Saint Helena, English astronomer Edmond Halley rediscovered this object in 1677, listing it as a non-stellar object. German cartographer Johann Bayer used Ptolemy's data to designate this object "Omega Centauri" with his 1603 publication of Uranometria. In 150 AD, Greco-Roman writer and astronomer Ptolemy catalogued this object in his Almagest as a star on the horse's back, "Quae est in principio scapulae". Omega Centauri is very different from most other galactic globular clusters to the extent that it is thought to have originated as the core remnant of a disrupted dwarf galaxy. It is estimated to contain approximately 10 million stars, and a total mass equivalent to 4 million solar masses, making it the most massive-known globular cluster in the Milky Way. 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. 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. See also: Globular cluster, List of globular clusters
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7/1/2023 03:46:14 pm
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