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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]
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Sagittarius contains several well-known nebulae, including the Lagoon Nebula (Messier 8), near λ Sagittarii; the Omega Nebula (Messier 17), near the border with Scutum; and the Trifid Nebula (Messier 20), a large nebula containing some very young, hot stars.
Messier 17; Swan Nebula; Omega Nebula Open cluster: Sagittarius: 18 h 20 m 26 s: −16° 11′ 6.7 6619: Galaxy: Hercules: 18 h 18 m 55.5 s: 23° 39′ 20″ 13.1 ...
Omega Nebula: Omega Nebula, Messier 17, NGC 6618, Swan Nebula, Sharpless 45, RCW 160, Gum 81 ... Gum 83: Eagle Nebula: Sh2 49, Messier 16, NGC 6611, RCW 165, Gum 83 ...
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For example, Messier 1 is a supernova remnant, known as the Crab Nebula, and the great spiral Andromeda Galaxy is M31. Further inclusions followed; the first addition came from Nicolas Camille Flammarion in 1921, who added Messier 104 after finding Messier's side note in his 1781 edition exemplar of the catalogue.