Messier 18
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| Observation data: J2000.0 epoch | |
|---|---|
| Class: | II,3,p,n |
| Constellation: | |
| Right ascension: | 18h 19.9m |
| Declination: | −17° 08′ |
| Distance: | 4.9 kly (1.5 kPc) |
| Apparent magnitude (V): | 7.5 |
| Apparent dimensions (V): | 9.0′ |
| Physical characteristics | |
| Mass: | ( M☉) |
| Radius: | 9 ly |
| VHB: | |
| Estimated age: | 32 million years |
| Notable features: | |
| Other designations: | NGC 6613 |
| See also: Open cluster, List of open clusters | |
Open Cluster M18 (also known as Messier Object 18 or NGC 6613) is an open cluster in the constellation Sagittarius. It was discovered by Charles Messier in 1764 and included in his list of comet-like objects. M18 is situated between the Omega Nebula (M17) and the Sagittarius Star Cloud (M24). Its age is estimated at 32 million years.
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