Checkmark Nebula
Emission nebula in Sagittarius
An object in the observing catalogue.
Also catalogued as Checkmark Nebula, Lobster Nebula, M17, Messier 17, NGC 6618, Swan Nebula, omega Nebula
Measurements and positionShowHide
- Position
- Right ascension 18h 20m 47.1s Declination −16° 10′ 18″J2000
- Where the object sits on the sky, in the coordinate system astronomers use. Right ascension is the east–west figure and declination the north–south one; J2000 names the reference date they are measured against.
- Brightness
- 7.00
- Apparent magnitude. The scale runs backwards — a smaller number is brighter, and around 6 is roughly the faintest the unaided eye can see from a dark site.
- Apparent size
- 12.6 arcminutes
- How large the object looks from here, not how large it is. The full Moon is about 30 arcminutes across, which is a useful thing to compare against.
Catalogue data from OpenNGC (Mattia Verga) · CC-BY-SA-4.0