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 2491
NGC 2491 is a spiral galaxy located in Canis Minor constellation. It is located 580 million light-years from Earth and has an approximate diameter of 130,000 light-years.
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Sources:
Wikipedia Page: NGC 2491
NGC 2491 at In-The-Sky website