Caldwell catalogue
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, 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.