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 252
NGC 252 is a lenticular galaxy located in the constellation Andromeda. It was discovered by William Herschel in 1786. One supernova has been observed in NGC 252: SN 1998de (type Ia, mag. 18.4) was discovered by the Lick Observatory Supernova Search (LOSS) on 23 July 1998.
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Wikipedia Page: NGC 252
NGC 252 at In-The-Sky website