This article is about the observatory in Richmond Hill, Ontario. For research centre at the University of Toronto, see Dunlap Institute for Astronomy & Astrophysics.
Observatory
David Dunlap Observatory
The 74-inch (1.9 m) telescope (left) and Administration Building (right) at the David Dunlap Observatory
Alternative names
DDO
Named after
David Alexander Dunlap
Organization
University of Toronto (1935–2008) Royal Astronomical Society of Canada (2009–2016) City of Richmond Hill (2018–)
David Dunlap Observatory National Historic Site of Canada
Designated
31 July 2019 (2019-07-31)
[edit on Wikidata]
Preview warning: Page using Template:Infobox observatory with unknown parameter "re-opened"
The David Dunlap Observatory (DDO) is an astronomical observatory site in Richmond Hill, Ontario, Canada. Established in 1935, it was owned and operated by the University of Toronto until 2008. It was then acquired by the city of Richmond Hill, which provides a combination of heritage preservation, unique recreation opportunities and a celebration of the astronomical history of the site. Its primary instrument is a 74-inch (1.88 m) 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 also included a small radio telescope. The scientific legacy of the David Dunlap Observatory continues in the Dunlap Institute for Astronomy & Astrophysics, a research institute at the University of Toronto established in 2008.
The DDO is the site of a number of important scientific 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.[1] Located on a hill, yet still relatively close to sea level at 730 feet (220 m) altitude, and now surrounded by urban settlement, its optical astronomy ability has been reduced as compared to other remote observatory sites around the world. On 31 July 2019, the DDO was accepted by the National Historic Board as a National Historic Site of Canada.[2]
^Polaris – The Story Continues Archived 30 September 2007 at the Wayback Machine Photoelectric Photometry Newsletter, American Association of Variable Star Observers, May 1998
^Government of Canada Announces Eight New National Historic Designations, Parks Canada news release, 31 July 2019
and 23 Related for: David Dunlap Observatory information
The DavidDunlapObservatory (DDO) is an astronomical observatory site in Richmond Hill, Ontario, Canada. Established in 1935, it was owned and operated...
astronomical facility promoted by astronomer Clarence Chant was named DavidDunlapObservatory. After educating himself in public schools and high school in his...
DavidDunlapObservatory Catalogue, known as the DDO or A Catalogue of Dwarf Galaxies, is a catalogue of dwarf galaxies that was compiled by Sidney van...
Toronto, after her husband had received a job offer to work at the DavidDunlapObservatory. For her first year there, Hogg continued her work photographing...
This is a list of observatory codes (IAU codes or MPC codes) published by the Minor Planet Center. For a detailed description, see observations of small...
Tennessee, a city Dunlap, Philadelphia, Pennsylvania, a neighborhood Dunlap, Seattle, Washington, a neighborhood Elsewhere DavidDunlapObservatory, Richmond...
Radcliffe shared fourth place with its near-twin the 74 in (1.9 m) at DavidDunlapObservatory. The two other telescopes in the top five were the 100 in (2.5 m)...
an astronomer at several observatories: Japan's 8.3-metre Subaru Telescope in Hawaii, the 1.9-metre DavidDunlapObservatory in Toronto, Athabasca University...
was a Canadian astronomer. He served as first director of the DavidDunlapObservatory from 1935 until 1946. Young was born on October 4, 1886, in the...
although exhibition and interfaculty games were still held. The DavidDunlapObservatory in Richmond Hill opened in 1935, followed by the University of...
Dominion Astrophysical Observatory (Home to 2nd largest telescope in the world in the 1910s on debut) DavidDunlapObservatory (Home to 2nd largest telescope...
and amateur astronomer David Alexander Dunlap to promote and develop plans for a world-class observatory for Canada. After Dunlap's death, his widow donated...
designation. In 1968, the "star" was identified by John Schmitt at the DavidDunlapObservatory as a bright, variable radio source. A faint trace of a host galaxy...
near-identical 74-inch (1.9 m) telescopes for the DavidDunlapObservatory (Ontario, Canada, 1935), Radcliffe Observatory (South Africa, construction completed 1938...
meteoroids. The observatory was closed at the end of 2010. DavidDunlapObservatory List of astronomical observatories "The Elginfield Observatory at the University...
brothers Duncan and John McMartin, and lawyer David Alexander Dunlap (for whom the DavidDunlapObservatory was named). The main Hollinger gold mine operated...
at Las Campanas Observatory: OGLE-III (Optical Gravitational Lensing Experiment) Variable Stars catalog website DavidDunlapObservatory of Toronto University:...
controversial. The magnitude of Vega was measured again in 1981 at the DavidDunlapObservatory and showed some slight variability. Thus it was suggested that...
This is a partial list of astronomical observatories ordered by name, along with initial dates of operation (where an accurate date is available) and...
Toronto in 1958 where he spent the first part of his career at the DavidDunlapObservatory (DDO) of the University of Toronto. At the DDO, he led innovations...
telescope at the ARO for some time, after having moved it from the DavidDunlapObservatory which proved to be too close to the growing Toronto area. The smaller...
Royal Astronomical Society of Canada and principal founder of the DavidDunlapObservatory, considered the father of Canadian astronomy John Cunningham McLennan...
Global Information
Related media on Commons