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 812
NGC 812 is a spiral galaxy located in the Andromeda constellation, an estimated 175 million light-years from the Milky Way. NGC 812 was discovered on December 11, 1876 by astronomer Édouard Stephan. Two supernovae have been observed in NGC 812: SN 2010jj (type IIn, mag. 17) and SN 2020udy (type Iax[02cx-like], mag. 19.6)
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Wikipedia Page: NGC 812
NGC 812 at In-The-Sky website