Messier M17
Omega Nebula
Emission Nebula
Sagittarius
Beginner
Bright HII region; excellent narrowband target.
Angular size
46′ × 37′
Magnitude
6
Best months
June, July, August
Constellation
Sagittarius
Catalog IDs
M17;NGC 6618
Common aliases
Omega Nebula;Swan Nebula;Horseshoe Nebula