CAs 3466 1721 105 616 4008 3152 CAs English author name string: C messier URL: https://commons.wikimedia.org/wiki/User:C_messierobject has role: photographer
known as MessierObject 18, Messier 18, M18, or NGC 6613) is an open cluster in the Sagittarius constellation. It was discovered by Charles Messier in 1764