M17 · nebula
Omega Nebula
The Omega Nebula is an H II region in the constellation Sagittarius.
RA18h 20m 47sDec−16° 10' 17"
Image: NASA/JPL-Caltech/Univ. of Wisc.. Source: JPL via images.nasa.gov.
Identity & coordinates
Identification
- Primary designation
- M17
- All designations
- M17 · NGC 6618 · Omega Nebula
- Object type
- Nebula
- Constellation
- Sagittarius
- Best viewing
- Summer
Coordinates & physical
- Right ascension (J2000)
- 18h 20m 47s
- Declination (J2000)
- −16° 10' 17"
- Apparent magnitude (V)
- —
- Distance
- —
Visibility tonight
The science
The Omega Nebula is an H II region in the constellation Sagittarius. It was discovered by Philippe Loys de Chéseaux in 1745. Charles Messier catalogued it in 1764. It is by some of the richest starfields of the Milky Way, figuring in the northern two-thirds of Sagittarius. This feature is also known as the Swan Nebula, Checkmark Nebula, Lobster Nebula, and the Horseshoe Nebula, and catalogued as Messier 17 or M17 or NGC 6618.
Summary adapted from Wikipedia · CC-BY-SA-4.0
References
- SIMBAD Not resolved
- NED Fetched May 8, 2026 View in NED ↗
- Wikipedia Fetched May 8, 2026 Read full article ↗
1 merge conflict resolved
- coordinates: SIMBAD missing → NED used