The New General Catalogue of Nebulae and Clusters of Stars (abbreviated as NGC) is a catalogue of deep-sky objects compiled by John Louis Emil Dreyer in 1888. The NGC contains 7,840 objects, known as the NGC objects. It is one of the largest comprehensive catalogues, as it includes all types of deep space objects, including galaxies, star clusters, emission nebulae and absorption nebulae.
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NGC 6366
NGC 6366 is a globular cluster located in the constellation Ophiuchus. It is designated as XI in the Shapley–Sawyer Concentration Class and was discovered by the German astronomer Friedrich August Theodor Winnecke on 12 April 1860. It is at a distance of 11,700 light years away from Earth. NGC 6366 is similar in composition to M 71 or NGC 6342. It is metal-rich for a globular cluster, and all of its stars appears to have formed in the same epoch.
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Wikipedia Page: NGC 6366
NGC 6366 at In-The-Sky website