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 5144
NGC 5144 is an unbarred spiral galaxy located in the constellation of Ursa Minor. It has a velocity of 3,202 ± 9 km/s corresponding to a Hubble Distance of 47.2 ± 3.3 megaparsecs (154 million light-years). It was discovered by William Herschel in May 1791. The luminosity class of NGC 5144 is classified as III with a broad HI line. It is a possible field galaxy which isn't belonging to a group or any cluster, making it gravitationally isolated. NGC 5144 is also a starburst galaxy and classified as a Markarian galaxy (designated as MRK 256), since its core emits out excessive amounts of ultraviolet light.
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Wikipedia Page: NGC 5144
NGC 5144 at In-The-Sky website