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 5999
NGC 5999 is an open cluster in the constellation Norma. Its brightest star is HIP 78355. It is 5310 light-years distant and thought to be around 400 million years old.
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Wikipedia Page: NGC 5999
NGC 5999 at In-The-Sky website