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Effective Aperture 3.6–4.9 M) 4.7 M 186″ Segmented, MMT (6×1.8 M) F

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Effective Aperture 3.6–4.9 M) 4.7 M 186″ Segmented, MMT (6×1.8 M) F Effective Effective Mirror type Name Site Built aperture aperture (m) (in) 10.4 m 409″ Segmented, Gran Telescopio Roque de los Muchachos 2006/9 36 Canarias (GTC) Obs., Canary Islands, Spain 10 m 394″ Segmented, Keck 1 Mauna Kea Observatories, 1993 36 Hawaii, USA 10 m 394″ Segmented, Keck 2 Mauna Kea Observatories, 1996 36 Hawaii, USA 9.8 m 386″ Segmented, Southern African South African Astronomical 2005 91 Large Telescope Obs., Northern Cape, South (SALT) Africa 9.2 m 362″ Segmented, Hobby-Eberly McDonald Observatory, 1997 91 Telescope (HET) Texas, USA (11 m × 9.8 m mirror) 8.4 m×2 330″×2 Multiple Large Binocular Mount Graham 2004 (can use mirror, 2 Telescope (LBT) Internationals Obs., Phased- Arizona array optics for combined 11.9 m[2]) 8.2 m 323″ Single Subaru (JNLT) Mauna Kea Observatories, 1999 Hawaii, USA 8.2 m 323″ Single VLT UT1 (Antu) Paranal Observatory, 1998 Antofagasta Region, Chile 8.2 m 323″ Single VLT UT2 (Kueyen) Paranal Observatory, 1999 Antofagasta Region, Chile 8.2 m 323″ Single VLT UT3 (Melipal) Paranal Observatory, 2000 Antofagasta Region, Chile 8.2 m 323″ Single VLT UT4 (Yepun) Paranal Observatory, 2001 Antofagasta Region, Chile 8.1 m 318″ Single Gemini North Mauna Kea Observatories, 1999 (Gillett) Hawaii, USA 8.1 m 318″ Single Gemini South Cerro Pachón (CTIO), 2001 Coquimbo Region, Chile 6.5 m 256″ Honeycomb Magellan 1 Las Campanas Obs., 2000 (Walter Baade) Coquimbo Region, Chile 6.5 m 256″ Honeycomb Magellan 2 Las Campanas Obs., 2002 (Landon Clay) Coquimbo Region, Chile 6.5 m 256″ Single MMT (1 x 6.5 M1) F. L. Whipple Obs., Arizona, 2000 USA 6 m 238″ Single BTA-6 Special Astrophysical Obs., 1975 Karachay–Cherkessia, Russia 6 m 236″ Liquid Large Zenith Maple Ridge, British 2003 Telescope (LZT) Columbia, Canada Effective Effective Mirror type Name Site Built aperture aperture (m) (in) 5.08 m 200″ Single Hale Telescope Palomar Observatory, 1948 (200 inch) California, USA 4.9 m– 193″ Segmented, LAMOST (6.67 m Beijing Astronomical Obs., 2008 3.6 m[5] (37 + 24) × 6.05 m + 5.72 m Xinglong, China × 4.40 m corrector; effective aperture 3.6–4.9 m) 4.7 m 186″ Segmented, MMT (6×1.8 m) F. L. Whipple Obs., Arizona, 1979– (6×1.8 m) 6 original optics USA 1998 4.3 m 169″ Single Discovery Lowell Observatory, Happy 2012 Channel Jack, Arizona Telescope 4.2 m 165″ Single William Herschel Roque de los Muchachos 1987 Telescope Obs., Canary Islands, Spain 4.1 m 161″ Single SOAR Cerro Pachón (CTIO), 2002 Coquimbo Region, Chile 4.1 m 161″ Single VISTA Paranal Observatory, 2009 Antofagasta Region, Chile 4 m 157″ Single Victor M. Blanco Cerro Tololo Inter- 1976 Telescope American Obs., Coquimbo Region, Chile 3.89 m 154″ Single Anglo-Australian Australian Astronomical 1975 Telescope (AAT) Obs., New South Wales, Australia 4 m 149.5″ Single Nicholas U. Kitt Peak National Obs., 1973 Mayall 4m Arizona, USA 3.67 m 145″ Single 3.67m AEOS Air Force Maui Optical 1996 Telescope (AEOS) Station, Hawaii, USA 3.58 m 142″ Single New Technology La Silla Observatory, 1989 Telescope (NTT) Coquimbo Region, Chile 3.58 m 141″ Single Canada-France- Mauna Kea Observatories, 1979 Hawaii Telescope Hawaii, USA (CFHT) 3.58 m 141″ Single Telescopio Roque de los Muchachos 1997 Nazionale Galileo Obs., Canary Islands, Spain (TNG) 3.57 m 140″ Single ESO 3.6 m La Silla Observatory, 1977 Telescope Coquimbo Region, Chile 3.5 m 138″ Single MPI-CAHA 3.5 m Calar Alto Obs., Almería, 1984 Spain 3.5 m 138″ Single Space White Sands Missile Range, 2011 Surveillance New Mexico, USA Telescope Effective Effective Mirror type Name Site Built aperture aperture (m) (in) 3.5 m 138″ Single USAF Starfire 3.5 Starfire Optical Range, New 1994 m Mexico, USA 3.5 m 138″ Single WIYN Telescope Kitt Peak National Obs., 1994 Arizona, USA 3.48 m 137″ Single Astrophysical Apache Point Obs., New 1994 Research Mexico, USA Consortium (ARC) 3.05 m 120″ Single Shane Telescope Lick Observatory, 1959 California, USA 3.0 m 120″ Single NASA Infrared Mauna Kea Observatory, 1979 Telescope Facility Hawaii, USA 3 m 118″ Liquid NASA-LMT retired NASA Orbital Debris Obs., 1995– New Mexico, USA 2002 2.72 m 107" Single Harlan J. Smith McDonald Observatory, 1969 Telescope Texas, USA 2.65 m 104" Liquid UBC-Laval LMT Vancouver, British 1992– Columbia, Canada 2.64 m 104" Single Shajn 2.6m Crimean Astrophysical 1961 Obs., Ukraine 2.61 m 102.8" Single VLT Survey Paranal Observatory, 2007 Telescope (VST) Antofagasta Region, Chile 2.6 m 102" Single BAO 2.6 Byurakan Astrophysical 1976 Obs., Mt. Aragatz, Armenia 2.56 m 101" Single Nordic Optical ORM, Canary Islands, Spain 1988 Telescope (NOT) 2.54 m 100" Single Isaac Newton ORM, Canary Islands, Spain 1984 Telescope (INT) (RGO, England, UK until '79) 2.54 m 100" Single Irenee du Pont Las Campanas Observatory, 1976 Telescope Coquimbo Region, Chile 2.54 m 100" Single Hooker 100-Inch Mt. Wilson Observatory, 1917 Telescope California, USA 2.5 m 98.4" Single SOFIA Boeing 747SP (mobile, 2007 USA) 2.5 m 98.4" Single Sloan DSS Apache Point Observatory, 1997 New Mexico, USA 2.4 m 94.5" Single Hiltner Telescope MDM Observatory (Kitt 1986 Peak), Arizona, USA 2.4 m 94.5" Single Thailand National Chalermprakhiat 2012 Telescope (TNT) Astronomical Observatory Commemorating King Bhumibhol's 7th Birthday Anniversary, Thailand 2.4 m 94.5" Single Lijiang Yunnan Astronomical 2008 Observatory, China Effective Effective Mirror type Name Site Built aperture aperture (m) (in) 2.4 m 94.5" Single Hubble (HST) Low Earth orbit 1990 2.4 m 94.5" Single 2.4-meter SINGLE Magdalena Ridge 2006/2 Telescope Observatory, New Mexico, 008 USA 2.4 m 94.5" Single Automated Lick Observatory, 2010 Planet Finder California, USA 2.34 m 92.1" Single Vainu Bappu Vainu Bappu Observatory, 1986 India 2.3 m 90.6" Single Aristarchos National Observatory of 2004 Athens, Mt. Helmos, Greece 2.3 m 90.6" Single IR WIRO 2.3 Wyoming Infrared 1977 Observatory, Wyoming, USA 2.3 m 90.6" Single ANU 2.3m ATT Siding Spring Observatory, 1984 New South Wales, Australia 2.3 m 90.6" Single Bok Telescope Kitt Peak National 1969 (90-inch) Observatory, Arizona, USA 2.24 m 88.2" Single University of Mauna Kea Observatories, 1970 Hawaii 2.2 m Hawaii, USA (UH88) 2.2 m 86.6" Single MPIA-ESO (ESO- La Silla Observatory, 1984[8] MPI) Coquimbo Region, Chile 2.2 m 86.6" Single MPIA-CAHA 2.2m Calar Alto Observatory, 1979 Almería, Spain 2.16 m 85" Single Xinglong 2.16m Xinglong, China 1989 2.15 m 84.6" Single Jorge Sahade Leoncito Astronomical 1987 2.15m Complex, San Juan Province, Argentina 2.12 m 83.5" Single INAOE 2.12 Guillermo Haro 1987 (OAGH) Observatory, Sonora, Mexico 2.12 m 83.5" Single UNAM 2.12 National Astronomical 1979 Observatory, Baja California, Mexico 2.1 m 82.7" Single Kitt Peak 2.1- Kitt Peak National 1964 meter Observatory, Arizona, USA 2.08 m 81.9" Single Otto Struve McDonald Observatory, 1939 Telescope Texas, USA 2.06 m 81.1" Single T13 Automated Fairborn Observatory, 2003 Spectroscopic Arizona, USA Telescope 2.01 m 79.1" Single Himalayan Indian Astronomical 2000 Chandra Observatory, India Telescope (HCT) Effective Effective Mirror type Name Site Built aperture aperture (m) (in) 2 m 78.7" Single Alfred Jensch Karl Schwarzschild 1960 Teleskop Observatory, Germany 2 m 78.7" Single Carl Zeiss Jena Shamakhi Astrophysical 1966 Obs., Azerbaijan 2 m 78.7" Single Ondřejov 2-m Ondřejov Observatory, 1967 Czech 2 m 78.7" Single Ritchey-Chretien- Rozhen Observatory, 1984 Coude (RCC) Bulgaria 2 m 78.7" Single Carl Zeiss Jena Main Ukraine Obs., Ukraine 2 m 78.7" Single Bernard Lyot Pic du Midi Obs., France 1980 Telescope 2 m 78.7" Single Liverpool ORM, Canary Islands, Spain 2003 Telescope 2 m 78.7" Single Faulkes Telescope Haleakala Observatory, 2003[1 North Hawaii, USA 8] 2 m 78.7" Single Faulkes Telescope Siding Spring Observatory, 2001 South New South Wales, Australia 2 m 78.7" Single IR MAGNUM Haleakala Observatory, 2001– Hawaii, USA 2008 125 cm 49.21" Fixed lens, Great Paris Paris 1900 Exposition 1900 scrapped. Exhibition Disman Aimed via a Telescope of 1900 tled 2m reflecting 1900 siderostat 102 cm 40" Largest in Yerkes Williams Bay, Wisconsin, 1897 current Observatory USA operation. 98 cm 39.37" Single Swedish 1-m La Palma, Spain 2002 element Solar Telescope, non- ORM achromatic objective combined with reflective Adaptive optics and a Schupmann corrector. 91 cm 36" James Lick Mount Hamilton, 1888 telescope, Lick California, USA Observatory 83 cm + 32.67" + Double Grande Lunette, Meudon, France 1891 62 cm 24.40" telescope Paris Observatory Effective Effective Mirror type Name Site Built aperture aperture (m) (in) 80 cm + 31.5" + Double Großer Refraktor, Potsdam, Deutsches 1899 50 cm 29.5" telescope Astrophysical Kaiserreich Observatory Potsdam 77 cm 30.3″ Biscoffschei Grande Lunette, Nice, France 1886 m funded Nice Observatory, since 1988 Côte d'Azur Observatory 76 cm 30" Brashear William Thaw Pittsburgh, Pennsylvania, 1914 made, Telescope, USA photographic Allegheny Observatory, University of Pittsburgh 76 cm 30" Destroyed Pulkovo Saint Petersburg, Russian 1885 during WWII, observatory Empire only lens (made by Alvan Clark & Sons) survives. 71 cm 28" 28-inch Grubb Greenwich, London, Great 1894 Refractor, Royal Britain Greenwich Observatory .
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