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 813
NGC 813 is a lenticular galaxy in the constellation Hydrus. It is estimated to be 390 million light-years from the Milky Way and has a diameter of approximately 140,000 ly. NGC 813 was discovered on November 24, 1834, by the British astronomer John Herschel. One supernova, SN 2020abzv (type Ia, mag. 16.6), was discovered in NGC 813 on 9 December, 2020.
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Wikipedia Page: NGC 813
NGC 813 at In-The-Sky website