Alt. Designations: NGC 6613
Object Type: Open Cluster
Constellation: Sagittarius
Distance: 4.9 kly
Right Ascension: 18h 19m 58.0s
Declination: -17° 06´ 06"
Visual Magnitude: 6.9
Apparent Dimension: 7.0' Dia.
Best Month To View: Jun

M18 is a small open cluster of about 20 stars located in the constellation Sagittarius. It lies about 5,000 light-years away with a diameter of about 17 light-years. The cluster contains only 12 fairly bright stars, and the cluster is rather loose in appearance. It is not one of the best examples of a galactic cluster, but it is a pretty sight in a small telescope. This a fairly young cluster, containing bright blue as well as yellow and orange stars.