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 6646
NGC 6646 is a spiral galaxy located in the constellation Lyra. Its velocity relative to the cosmic microwave background is 5,641 ± 35 km/s, which corresponds to a Hubble distance of 83.2 ± 5.9 Mpc (∼271 million ly). NGC 6646 was discovered by the German-British astronomer William Herschel on 26 June 1802. The luminosity class of NGC 6646 is I. One supernova has been observed in NGC 6646: SN 2024gqf (type Ia, mag. 19.7).
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Wikipedia Page: NGC 6646
NGC 6646 at In-The-Sky website