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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 ]
ω Centauri (NGC 5139), despite being listed as the constellation's "omega" star, is in fact a naked-eye globular cluster, 17,000 light-years away with a diameter of 150 light-years. It is the largest and brightest globular cluster in the Milky Way ; at ten times the size of the next-largest cluster, [ 7 ] it has a magnitude of 3.7.
Omega Aurigae, Latinized from ω Aurigae, is the Bayer designation for a double star [11] in the northern constellation of Auriga. Its apparent magnitude is 4.95, [2] which is bright enough to be seen with the naked eye. The distance to this system, as determined using parallax measurements, is approximately 162 light-years (50 parsecs). [1]
Omega Sagittarii, which is Latinized from ω Sagittarii, is a binary star system in the constellation of Sagittarius, [9] near the eastern constellation border with Capricornus. It is formally named Terebellum / t ɛr ɪ ˈ b ɛ l əm /. [10] [11] This system has a yellow hue and is faintly visible to the naked eye with an apparent visual ...
Omega Fornacis, which is Latinized from ω Fornacis, is a wide binary star [11] system in the southern constellation of Fornax. It has a blue-white hue and is faintly visible to the naked eye as a fifth-magnitude star. [ 6 ]
The Omega Nebula is between 5,000 and 6,000 light-years from Earth and it spans some 15 light-years in diameter. The cloud of interstellar matter of which this nebula is a part is roughly 40 light-years in diameter and has a mass of 30,000 solar masses. [3] The total mass of the Omega Nebula is an estimated 800 solar masses. [4]