|Observation data (J2000.0 epoch)|
|Right ascension||18h 19.9m|
|Distance||4.9 kly (1.5 kPc)|
|Apparent magnitude (V)||7.5|
|Apparent dimensions (V)||9.0′|
|Other designations||NGC 6613|
Messier 18 or M18 (also designated NGC 6613) is an w:open cluster of w:stars in the w:constellation Sagittarius. It was discovered by w:Charles Messier in w:1764 and included in his list of w:comet-like objects. From the perspective of w:Earth, M18 is situated between the w:Omega Nebula (M17) and the w:Sagittarius Star Cloud (M24). Its age is estimated at 32 million years.