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 6866
NGC 6866 is an open cluster in the constellation Cygnus. It was discovered by Caroline Herschel on 23 July 1783. NGC 6866 is located in what was the field of view of the Kepler spacecraft. Using asteroseismic analysis, the age of NGC 6866 was estimated to be about 430 million years old.
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Wikipedia Page: NGC 6866
NGC 6866 at In-The-Sky website