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 6400
NGC 6400 is an open cluster located in the constellation Scorpius. It is designated as II2m in the galaxy morphological classification scheme and was discovered by the Scottish astronomer James Dunlop on 13 May 1826. It is at a distance of 3,097 light years away from Earth.
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Wikipedia Page: NGC 6400
NGC 6400 at In-The-Sky website