Caldwell Catalogue

A list of 109 bright deep-sky objects compiled by the British amateur astronomer Sir Patrick Moore to complement the Messier Catalogue, which it deliberately avoids duplicating. Ordered by declination and spanning both hemispheres, it gathers showpiece galaxies, clusters, and nebulae — such as the Hyades and NGC 869/884 — that Messier omitted. Objects carry a 'C' number.