The Caldwell Objects and How to Observe Them

The Messier's catalog of 109 'non-stellar' objects is still used by amateur astronomers as a guide to interesting objects to view and image. In 1995 the notable English astronomer and broadcaster Sir Patrick Moore published his own catalog of a further 109 objects, to complement the Messier catalog and provide an extended list of fascinating targets for amateur astronomers. He called it the Caldwell Catalog (Sir Patrick's full name is Patrick Alfred Caldwell-Moore), the 'M' designation having already been used by Messier. Some of the objects included are Caldwell 11 (The Bubble Nebula), spiral galaxy Calwell 30, and Caldwell 49 and 50 (The Rosette Nebulae).