James Dunlop's Catalog of Deepsky Objects
In the years 1823-1827, James Dunlop (1795-1848) observed the southern skies
from the Brisbane observatory at Paramatta, New South Wales, Australia.
He compiled several catalogs, among them the Brisbane Catalogue of over
7000 southern stars, and A Catalogue of Nebulae and Clusters of Stars in
the Southern Hemisphere observed in New South Wales of 629 entries for
deepsky objects [Dunlop (1828)]. However, many of
these objects are badly described, so that John Herschel could only verify 211
of them. New research, led by Glen Cozens, brought up a number of further "real"
objects, so that actually roughly over 300 (or about 50 %) seem to belong to
"real" deepsky objects. The other half is asterisms and multiple stars which
Dunlop's comparatively small instruments (a 9-feet FL, 9-inch aperture
reflector with speculum metal mirror, perhaps equivalent to about a modern
6-inch reflector) didn't resolve.
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, open and globular clusters, diffuse nebulae, and 4 planetary nebulae
(NGC 2818=Dun 564, NGC 5189=Dun 252, NGC 5882=Dun 447, and NGC 6563=Dun 606).
Dunlop has included 6 Messier objects in his list:
M70=Dun 614, and
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 catalogue online:
- James Dunlop, 1828.
A Catalogue of Nebulae and Clusters of Stars in the Southern Hemisphere
observed in New South Wales.
Philosophical Transactions of the Royal Society, Vol. 118, p. 113-151
- Glen Cozens and Graeme L. White, 2001.
James Dunlop: Messier of the Southern Sky.
Sky & Telescope, Vol. 101, No. 6 (June 2001), p. 112-116.
Other Deep Sky catalogs suitable for the
History of the Discovery of the Deepsky Objects
Last Modification: 8 May 2001