Messier 23 (also M23, NGC 6494 and OCL 30) is a magnitude +6.9 open star cluster located 2,150 light-years away in the constellation Sagittarius.
The cluster was discovered by French astronomer Charles Messier on the 20th June 1764.
Right Ascension 17h 56m 56s, Declination -19° 00' 42"
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