Omega Nebula from w:Hubble Space Telescope
|Observation data: w:J2000 epoch|
|Right ascension||18h 20m 26s|
|Declination||−16° 10′ 36″|
|Apparent magnitude (V)||+6.0|
|Apparent dimensions (V)||11 arcmins|
|Absolute magnitude (V)||-|
|Other designations||M17, NGC 6618,
Swan Nebula, Sharpless 45, RCW 160, Gum 81
The Omega Nebula, also known as the Swan Nebula (catalogued as Messier 17 or M17 and as NGC 6618) is an w:H II region in the w:constellation Sagittarius. It was discovered by w:Philippe Loys de Chéseaux in 1745. w:Charles Messier catalogued it in 1764. It is located in the rich w:starfields of the Sagittarius area of the w:Milky Way.
The Omega Nebula is between 5,000 and 6,000 w:light-years from w:Earth and it spans some 15 light-years in diameter. The cloud of interstellar matter of which this w:nebula is a part is roughly 40 light-years in diameter. The total w:mass of the Omega Nebula is an estimated 800 w:solar masses.
- Messier 17, SEDS Messier pages
- Messier 17 Amateur Image by Waid Observatory
- Omega Nebula at ESA/Hubble