The most spectacular original discovery of Dunlop is perhaps that of peculiar radio galaxy NGC 5128 in Centaurus (also called Centaurus A), his Dunlop 482. Also included in his original discoveries are Sculptor Group galaxies NGC 55 (Dun 507), 300 (Dun 530), and 7793 (Dun 608), and a considerable number of further southern galaxies, diffuse nebulae, open clusters, as well as 23 new globular clusters (plus two independent rediscoveries), and 4 planetary nebulae (NGC 2818=Dun 564, NGC 5189=Dun 252, NGC 5882=Dun 447, and NGC 6563=Dun 606). Dunlop has included 7 Messier objects in his list: M6=Dun 612, M54=Dun 624, M55=Dun 620, M62=Dun 627, M69=Dun 613, M70=Dun 614, and M83=Dun 628. These are all but one (M7) south of his declination limit of Dec=-30:00 (1826); perhaps that cluster was too large and scattered for his telescope.
The Dunlop catalog is arranged in the order of increasing declination or south polar distance, from south to north; objects which are nearest to the South Celestial Pole come first. This explains the late numbering of the comparatively northern Messier objects; M83 is (almost) the northernmost Dunlop object.
This endeavor was the second major effort of a deepsky object survey of the southern skies, after Lacaille's list of 42, of 1751-1752.
Here we offer the following options related to Dunlop's catalog online:
Last Modification: September 18, 2007