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Loading contentThe New General Catalogue and its two Index Catalogue supplements, compiled by J. L. E. Dreyer from the visual discoveries of the Herschels and their successors. Together the NGC and IC number nearly 13,000 galaxies, clusters, and nebulae and remain the most widely used designations for deep-sky objects.
Facts on this topic will be cited from these primary and reference sources.
Official naming, definitions, constellation boundaries, and astronomical nomenclature.