David Dunlap Observatory Catalogue
David Dunlap Observatory Catalogue, known as the DDO or A Catalogue of Dwarf Galaxies, is a catalogue of dwarf galaxies that was compiled by Sidney van den Bergh and published by the David Dunlap Observatory in 1959, and later expanded in 1966.
Examples
DDO 3
DDO 3 is a dwarf spheroidal galaxy which is located in the northern constellation of Cassiopeia, near the border of Andromeda. It is a small satellite galaxy of the famous Messier 31, which is the largest galaxy in the Local Group.
DDO 8
DDO 8 is a dwarf irregular galaxy in the constellation Cetus, near the border of Pisces. It was discovered in 1906 by a German astronomer Max Wolf. It is a member of the Local Group.
DDO 69 is an irregular galaxy which is located in the constellation of Leo. It is a small satellite galaxy of the Milky Way.
DDO 70
DDO 70 is an irregular galaxy which is in the constellation of Sextans. It is located 4.44 million light years away from Earth.
DDO 74
DDO 74 lies approximately 820,000 light years away in the constellation Leo. It is one of the most distant satellite galaxy of the Milky Way. The dwarf spheroidal galaxy is located only 12 arcminutes from Regulus, and the light from Regulus makes the visibility of DDO 74 becomes poor, so it is difficult to be observed.
DDO 75 is an irregular galaxy located in the constellation Sextans, same as its neighbour DDO 70. When it is observed from Earth, it appears as a square in shape.
DDO 82
DDO 82 is a Magellanic spiral galaxy lies 13 million light years away in the constellation Ursa Major.
DDO 93
DDO 93 is a dwarf spheroidal galaxy which is located in the constellation of Leo. It was discovered in 1950 by Robert George Harrington and Albert George Wilson. It is one of the satellite galaxies of the Milky Way.
DDO 155 is a dwarf irregular galaxy located approximately 7.9 million light years away from Earth in the constellation of Virgo. A nickname for this galaxy, "Imprint of a Foot", is based on its shape.
DDO 169 is a dwarf irregular galaxy in the constellation Canes Venatici. It is one of the members of the M51 Group.
DDO 190 is a dwarf irregular galaxy which is located in the constellation of Boötes. It is a member of the M94 Group as well.
DDO 199
DDO 199 is a dwarf spheroidal galaxy which is located in the northern constellation of Ursa Minor. It was discovered in 1955 by an American astronomer Albert George Wilson. It is a satellite of the Milky Way.
DDO 210
DDO 210 is a dwarf irregular galaxy in the constellation of Aquarius. It is a member of the Local Group and lies 3.2 ± 0.2 million light years from the Milky Way.
[Pegasus Dwarf galaxy|Dwarf Irregular Galaxy|DDO 216] is a dwarf irregular galaxy located in the constellation Pegasus.