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The 'New General Catalogue' was an update to Sir John Herschel's 'General Catalogue,' hence the name 'NGC'. Henry Dreyer and Annie Jump Cannon compiled the NGC in the late 19th and early 20th century. This catalog, like its predecessor the GC, focused on cataloging the non-stellar deep sky objects found in astro-photographic plates. The nature of many of these objects was not understood until many years later.

John Herschel's General Catalog (GC) of nonstellar objects of 1864 contained over 5,000 objects, while J.L.E. Dreyer's New General Catalogue (NGC), together with its two supplements (Index Catalog I and II, IC) summarize over 13,000 deep sky objects. Each catalogue entry is of the form NGC, and the types of objects catalogued include galaxies, nebulae, open and closed clusters and globular clusters. On-line versions of the catalogue are available at a number of sites, including http://www.seds.org/~spider/ngc/ngc.html

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