Caldwell number
Caldwell number
[′kȯl‚dwel ¦nəm·bər] (astronomy)
A number by which star clusters, nebulae, and galaxies are listed in the Caldwell Catalog, arranged in order of declination; for example, the Hyades are C41.
References in periodicals archive
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Deep-sky selections are dutifully labeled with Messier and Caldwell numbers, but the catalogs themselves await introduction in an appendix.
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