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David Dunlap Observatory

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David Dunlap Observatory
David Dunlap Observatory
David Dunlap Observatory
David Dunlap Observatory
David Dunlap Observatory
David Dunlap Observatory
David Dunlap Observatory
David Dunlap Observatory
David Dunlap Observatory
David Dunlap Observatory
David Dunlap Observatory
David Dunlap Observatory
David Dunlap Observatory
David Dunlap Observatory
David Dunlap Observatory
David Dunlap Observatory
David Dunlap Observatory
David Dunlap Observatory
David Dunlap Observatory
David Dunlap Observatory
David Dunlap Observatory
David Dunlap Observatory
David Dunlap Observatory
David Dunlap Observatory
Phone:
+1 905-883-0174

Address:
123 Hillsview Dr, Richmond Hill, ON L4C 1T3, Canada

The David Dunlap Observatory is a large astronomical observatory site just north of Toronto in Richmond Hill, Ontario, housed on a 189-acre estate. Formerly owned and operated by the University of Toronto from its establishment in 1935 until 2008, the observatory is now managed by the Royal Astronomical Society of Canada, Toronto Centre and the David Dunlap Observatory Defenders . Its primary instrument is a 74-inch reflector telescope, at one time the second-largest telescope in the world, and still the largest in Canada. Several other telescopes are also located at the site, which formerly included a small radio telescope as well. The DDO is the site of a number of important studies, including pioneering measurements of the distance to globular clusters, providing the first direct evidence that Cygnus X-1 was a black hole, and the discovery that Polaris was stabilizing and appeared to be falling out of the Cepheid variable category. Located on a hill, yet still relatively close to sea level at 730 feet altitude, and now surrounded by subdivisions, its optical astronomy ability has been reduced as compared to other remote observatory sites around the world.
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