Draco Dwarf

Dwarf Spheroidal Galaxy Draco Dwarf (UGC 10822, DDO 208, A1719), type dE0 pec, in Draco

RA:
17 : 20.1
Dec:
+57 : 55
Type:
dE0 pec
RV:
-31 km/s
Distance:
280 kly
Apparent Dimension:
51.0 x 31.0 arc min
Diameter:
Brightness:
9.9 m_v
Abs. Mag:
Mass:
Discovered by A.G. Wilson in 1954.

The Draco Dwarf was discovered by Albert G. Wilson of Lowell Observatory, who had already discovered dwarf galaxy Leo I some years earlier, on photographic plates from the National Geographic Society - Palomar Observatory Sky Survey (POSS) in 1954, together with the Ursa Minor Dwarf (Wilson 1955). It was subsequently investigated by Walter Baade and Henrietta H. Swope (1961) who found over 260 variables (including 5 RR Lyrae stars), and by Paul W. Hodge (1964) who analysed the distribution of its stars.

The Draco Dwarf is one of the faintest galaxies known. As a dwarf elliptical or dwarf spheroidal galaxy, it contains only an old population of stars and no significant amount of interstellar matter. It is one of the small satellite galaxies of our Milky Way Galaxy, at a distance of about 280,000 light years.

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Hartmut Frommert
Christine Kronberg
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Last Modification: May 26, 2002