Definitions

Optical telescopes

List of optical telescopes

Several hundred more observatories (many optical) are listed here



Telescopes in operation or construction

Name Abbreviation Remarks Location
Anglo-Australian Observatory AAO 3.9 metre Anglo-Australian Telescope, ANU's Siding Spring 2.3 m Telescope, 1.2 metre UK Schmidt Telescope Coonabarabran, New South Wales (Australia)
Canada-France-Hawaii Telescope CFHT 3.6 metre Canada-France-Hawaii Telescope Mauna Kea, Hawaii (USA)
David Dunlap Observatory DDO Richmond Hill, Ontario (Canada)
McDonald Observatory 9.2m Hobby-Eberly Telescope, 2.7m Harlan J. Smith Telescope, 2.1m Otto Struve Telescope Davis Mountains, 450 miles west of Austin, Texas (USA)
Infrared Optical Telescope Array IOTA Amado, Arizona (USA)
Keck Telescopes Keck Two 10m optical/infrared telescopes (occasionally used as an astronomical interferometer) Mauna Kea, Hawaii (USA)
Magdalena Ridge Observatory Interferometer MRO Astronomical interferometer which will have up to ten telescopes, providing the highest resolution optical images in the world Magdalena Ridge, New Mexico (USA)
Nordic Optical Telescope NOT 2.6m optical/infrared telescope. Canary Islands, Spain
Southern African Large Telescope SALT At 11m, the biggest telescope in the southern hemisphere of the Earth. Karoo, South Africa
Very Large Telescope VLT Four separate 8m optical/infrared telescopes (occasionally used as an astronomical interferometer). Paranal Observatory, Chile
William Herschel Telescope WHT 4.2m optical/infrared telescope. Canary Islands, Spain

Telescope projects not fully funded yet

Name Abbreviation Remarks Location
California Extremely Large Telescope CELT 30-60m optical telescope (planned), by Californian Universities Not decided yet
European Extremely Large Telescope (E-ELT) E-ELT 30-60m optical telescope (planned), by the European Southern Observatory Not decided yet
Euro 50 EURO50 50m optical telescope (planned), cooperation from

Roque de los Muchachos Observatory, La Palma (Canary Islands)
Giant Magellan Telescope GMT 25m optical telescope (planned) Not decided yet
Overwhelmingly Large Telescope OWL Conceptual design of a segmented mirror telescope with a single aperture of 100 meters in diameter. Still on research status.
Thirty meter telescope TMT Conceptual design of a segmented mirror telescope with a single aperture of 30 meters in diameter. Still on research status.
Group 70 LAT 1.8m (70 inch) Amateur telescope, under development TBD, California (USA)

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