Deep-sky Companions: The Caldwell Objects (deep... May 2026

Deep-Sky Companions: The Caldwell Objects Stephen James O’Meara Publisher: Cambridge University Press Subject: Observational Astronomy / Deep-Sky Catalogues Abstract

The Caldwell Catalogue, compiled by Sir Patrick Moore in 1995, serves as the definitive spiritual successor to the historic Messier Catalogue. While Charles Messier’s 18th-century list focused on objects that could be confused with comets from a Northern Hemisphere perspective, the Caldwell list identifies 109 spectacular deep-sky targets—including galaxies, nebulae, and star clusters—visible across both the northern and southern celestial spheres. Stephen James O’Meara’s seminal work, Deep-Sky Companions: The Caldwell Objects , provides the most comprehensive visual guide to these targets, blending meticulous sketches with historical and astrophysical insights. Deep-Sky Companions: The Caldwell Objects (Deep...

In December 1995, Sir Patrick Moore published a list of 109 celestial objects in Sky & Telescope to address the gaps in the Messier Catalogue. Deep-Sky Companions: The Caldwell Objects In December 1995, Sir Patrick Moore published a