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Observatories and Instruments

David Dunlap Observatory

Ground-Based Optical Observatories

A Canadian observatory near Toronto, opened in 1935 by the University of Toronto and home to a 74-inch reflecting telescope that was, at completion, the second-largest in the world. It served as Canada's principal research observatory for decades before urban light pollution ended its professional research role.

Facts
Observatory Type
Optical observatory (reflecting telescope) 2
Location
Richmond Hill, Ontario, Canada 2
Operational
from 1935 2
Measures
Visible light, used for measuring distances to globular clusters 2
Operating Principle
Reflecting telescope with a 74-inch (1.88 m) primary mirror 2
Classification
Observing Band
Radio 1
Observing Band
Optical / Visible 1
Connections

Operated By

University of Toronto, Space Agencies and Companies
Source Wikipedia: David Dunlap Observatory
In the Other Atlases

Located In

Canada

Also in Geography Atlas: where this subject is located.

Sources
1. Wikipedia (space and spaceflight articles)
Wikimedia Foundation
2. Wikipedia: David Dunlap Observatory
  • Lead section, primary instrument sentence (type)
    Its primary instrument is a 74-inch (1.88 m) reflector telescope
  • Lead section, opening sentence naming location
    in Richmond Hill, Ontario, Canada
  • Construction section, opening date
    The official opening was on 31 May 1935
  • Lead section, sentence on scientific studies
    pioneering measurements of the distance to globular clusters
  • Lead section, primary instrument sentence (design)
    Its primary instrument is a 74-inch (1.88 m) reflector telescope
  • David Dunlap Observatory, Wikipedia - lead section, observing band (optical)
    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.
  • David Dunlap Observatory, Wikipedia - lead section, observing band (radio)
    Several other telescopes are also located at the site, which formerly also included a small radio telescope.
  • In Group: Optical Observatories of the Americas, Lead sentence
    The David Dunlap Observatory (DDO) is an astronomical observatory site in Richmond Hill, Ontario, Canada.
  • Operated By: University of Toronto, Lead
    Established in 1935, it was owned and operated by the University of Toronto until 2008.
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