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 3172
NGC 3172 (also known as Polarissima Borealis) is a lenticular galaxy located in the constellation Ursa Minor. It is the closest NGC object to the north celestial pole. Discovered by John Herschel in 1831, it is about 285 million light-years away and about 85 thousand light-years across. Two supernovae have been observed in NGC 3172. SN 2010af (type Ia, mag. 17.2), was discovered on 4 March, 2010. SN 2017gla (type Ia, mag. 16), was discovered on 1 September, 2017.
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Wikipedia Page: NGC 3172
NGC 3172 at In-The-Sky website