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The Caldwell Catalog is an astronomical catalog of 109 bright star clusters, nebulae, and galaxies for observation by amateur astronomers. The list was compiled by Sir Patrick Caldwell-Moore as a complement to the Messier Catalogue.
Moore observed that the Messier Catalogue, which was compiled based on observations in the Northern Hemisphere, excluded bright deep-sky objects visible in the Southern Hemisphere such as Omega Centauri, Centaurus A, the Jewel Box, and 47 Tucanae. He quickly compiled a list of 109 objects (to match the number of objects in the Messier Catalogue) and published it in Sky & Telescope in December 1995.
A natural progression for the amateur astronomer wishing to observe deep sky objects would be to view the Messier catalog, followed by the Caldwell catalog, and then the Herschel 400 Catalog. At the end of this exercise the observer would have viewed nearly 600 objects. Although there are 618 objects listed in these three catalogues the Herschel 400 Catalogue does contain some objects from the Messier and Caldwell catalogues.
For me, the progression has been the Messier catalog, then the Caldwell catalog. Then, because of my equipment, I have jumped to the Sharpless catalog of emission nubulae.
You can see my Caldwell images below...
 Caldwell 4 |
 Caldwell 9 |
 Caldwell 11 |
 Caldwell 14 |
 Caldwell 19 |
 Caldwell 20 |
 Caldwell 27 |
 Caldwell 28 |
 Caldwell 33 |
 Caldwell 34 |
 Caldwell 38 |
 Caldwell 49 |
 Caldwell 63 |
 Caldwell 65 |
 Caldwell 00 |
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