Omega Nebula
H II region in the constellation Sagittarius, discovered by Philippe Loys de Chéseaux
The Omega Nebula (nicknamed the Swan Nebula) is an H II region in the constellation of Sagittarius. It is about 5,500 light-years away from Earth. It was discovered by Philippe Loys de Chéseaux in 1745.[1] Charles Messier added it to his catalog as M17 on the night of 3 June 1764.[2] M17 has more names than any other deep-sky object. In addition to the Omega Nebula and Swan Nebula, it is also called the Horseshoe Nebula, the Checkmark Nebula and the Lobster Nebula.[2] Omega can be seen through binoculars or a small telescope.[3]
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References
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