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 5820
NGC 5820 is a lenticular galaxy in the constellation Boötes. It lies near NGC 5821, a galaxy with a similar mass at the same redshift.
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Sources:
Wikipedia Page: NGC 5820
NGC 5820 at In-The-Sky website