Messier 18 (also M18, NGC 6613 and OCL 40) is a magnitude +7.5 open cluster located 4,900 light-years away in the constellation Sagittarius.
The cluster was discovered by French astronomer Charles Messier on the 3rd June 1764.
Right Ascension 18h 19m 54.0s, Declination -17º 07' 59"
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