The Caldwell catalogue is an astronomical catalogue of 109 objects. It includes star clusters , nebulae , and galaxies for observation by amateur astronomers. The list was compiled by English astronomer Patrick Moore as a complement to the Messier catalogue . ^[1]

The Messier catalogue is used by amateur astronomers as a list of deep-sky objects for observation. However, it was not compiled for that purpose. It does not include many of the sky's brightest deep-sky objects, ^[1] such as the Hyades , the Double Cluster ( NGC 869 and NGC 884 ), and the Sculptor Galaxy (NGC 253). The Messier catalogue was compiled as a list of known objects that might be confused with comets . As Messier got his list from observations in Paris, it did not include bright deep-sky objects visible in the Southern Hemisphere , such as Omega Centauri , Centaurus A , the Jewel Box , and 47 Tucanae . ^{[1] [2]}

So Moore compiled a list of 109 objects ? to match the accepted number of Messier objects. ^[1] The list was published in Sky & Telescope in December 1995. ^[3]

References [ change | change source ]

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