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Globular cluster Messier 9 (M9, NGC 6333) is one of the original discoveries of Charles Messier, who cataloged it on May 28, 1764, and described it as "Nebula without star" of 3' diameter.
M9 is one of the nearer globular clusters to the nucleus of our Galaxy, with a computed distance of 5500 light-years from the Galactic Center (Burnham gives 7500, a slightly too high value).
M9 is found best from the 2.43-mag star Sabik (35 Eta Ophiuchi, spectrum A2 V); M9 is about 3 deg SE (2.1deg E and 2.8deg S).
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