Caldwell catalog

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Caldwell catalog

[′kȯl‚dwel ¦kad·ə‚läg]
(astronomy)
A catalog of star clusters, nebulae, and galaxies for the use of amateur observers, whose objects are easy to locate with a small telescope but are not included in Messier's Catalog.
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The Caldwell catalogue did not exist at this time but, as he has in so many other ways, Sir Patrick identified the need and satisfied it.