Omega nebula

(redirected from Lobster Nebula)

Omega nebula

(Swan nebula; Horseshoe nebula; M17; NGC 6618) An emission nebula with a conspicuous bar that lies at a distance of 2200 parsecs in the constellation of Sagittarius, very close to its northern boundary with Scutum. The nebula's apparent magnitude is 7. It is an H II region and a double radio source. The M17SW molecular cloud is a site of massive star formation; the interface between the nebula and M17SW is an example of an edge-on photodissociation region.

Omega Nebula

[ō′meg·ə ′neb·yə·lə]
(astronomy)
A bright H II region in the constellation Sagittarius that is both a bright far-infrared source and a double radio source. Also known as Swan Nebula.
References in periodicals archive ?
Messier 17 has at least five proper names--Omega Nebula, Horseshoe Nebula, Checkmark Nebula, Swan Nebula, and the Lobster Nebula.
These other titles include the Swan Nebula, the Horseshoe Nebula and even the Lobster Nebula.
Our final stop is the nebula Messier 17, which has been imagined taking shapes that lend it nicknames such as the Omega, Swan, Checkmark, Horseshoe, or Lobster Nebula.
The `swan' bit takes a bit of imagination, and is obviously open to ambiguity: it's also known as the Lobster Nebula and Horseshoe Nebula.
Waldee's 10-inch reflector at 46x with an O III filter displays the Lobster Nebula as a 25' patchy haze with a bright spot at the location of NGC 6357 and Pismis 24.