Name/Observatory | Aperture m | Aper. in | Mirror type | Nationality of Sponsors | Site and/or Observatory | FL or Built | Image |
Keck 1 | 10 m | 394″ | Segmented, 36 | United States | Mauna Kea Observatory, Hawaii | 1993 |  |
Keck 2 | 10 m | 394″ | Segmented, 36 | United States | Mauna Kea Observatory, Hawaii | 1996 |  |
Hobby–Eberly Telescope (HET) | 9.2 m | 362″ | Segmented,91 | United States, Germany | McDonald Observatory, Texas | 1997 |  |
Subaru (JNLT) | 8.2 m | 323″ | Single | Japan | Mauna Kea Observatory, Hawaii | 1999 |  |
VLT 1 (Antu) | 8.2 m | 323″ | Single | ESO Countries + Chile | Paranal Observatory, Chile | 1998 |  |
VLT 2 (Kueyen) | 8.2 m | 323″ | Single | ESO Countries + Chile | Paranal Observatory, Chile | 1999 |
VLT 3 (Melipal) | 8.2 m | 323″ | Single | ESO Countries + Chile | Paranal Observatory, Chile | 2000* |
VLT 4 (Yepun) | 8.2 m | 323″ | Single | ESO Countries + Chile | Paranal Observatory, Chile | 2001* |
Gemini North (Gillett) | 8.1 m | 318″ | Single | United States, Canada, Chile, Australia, Argentina, Brazil | Mauna Kea Obs., Hawaii | 1999 |  |
Gemini South | 8.1 m | 318″ | Single | United States, Canada, Chile, Australia, Argentina, Brazil | Cerro Pachón, Chile | 2001 |
MMT | 6.5 m | 256″ | Single | United States | F. L. Whipple Obs., Arizona | 2000 |
Magellan 1 (Walter Baade)[1] | 6.5 m | 256″ | Honeycomb | United States | Las Campanas Obs., Chile | 2000 |  |
Magellan 2 (Landon Clay) | 6.5 m | 256″ | Honeycomb | United States | Las Campanas Obs., Chile | 2002* |
BTA-6 | 6 m | 238″ | Single | USSR + Russia | Zelenchukskaya, Caucasus | 1976 |
Hale Telescope (200 inch) | 5.08 m | 200″ | Single | United States | Palomar Observatory, California | 1948 |  |
MMT (original) (6 × 1.8 m) optics replaced | 4.7 m (6 × 1.8 m) | 186″ | 6 mirrors | United States | F. L. Whipple Obs., Arizona | 1979–1998 |
William Herschel Telescope | 4.2 m | 165″ | Single | UK, Netherlands, Spain | ORM, Canary Islands | 1987 |  |
SOAR | 4.1 m | 161″ | Single | United States, Brazil | Cerro Pachón, Chile | 2002* |  |
Nicholas U. Mayall 4m[2] | 4 m | 158″ | Single | USA | Kitt Peak National Obs.; Arizona | 1973 |  |
Victor M. Blanco Telescope | 4 m | 158″ | Single | USA | Cerro Tololo Inter-American Obs., Chile | 1976 |  |
Anglo-Australian Telescope (AAT) | 3.89 m | 154″ | Single | United Kingdom + Australia | Anglo-Australian Obs.; Siding Spring, Australia | 1975 |  |
United Kingdom Infrared Telescope (UKIRT) | 3.8 m | 150″ | Single IR | United Kingdom | Mauna Kea Observatories; Mauna Kea, Hawaii | 1978 |
3.67m AEOS Telescope (AEOS) | 3.67 m | 145″ | Single | United States | Air Force Maui Optical Station; Haleakala, Hawaii | 1996 |
Telescopio Nazionale Galileo (TNG) | 3.58 m | 138″ | Single | Italy | ORM; La Palma, Canary Islands | 1997 |  |
New Technology Telescope (NTT) | 3.58 m | 142″ | Single | ESO countries | European Southern Observatory; Cerro La Silla, Chile | 1989 |  |
Canada-France-Hawaii Telescope (CFHT) | 3.58 m | 141″ | Single | Canada, France, United States | Mauna Kea Observatories, USA | 1979 |  |
ESO 3.6 m Telescope | 3.57 m | 140″ | Single | ESO countries | European Southern Observatory; Cerro La Silla, Chile | 1977 |  |
MPI-CAHA 3.5m[3] | 3.5 m | 138″ | Single | West Germany+Spain | Calar Alto Obs., Spain | 1984 |
USAF Starfire 3.5m[4] | 3.5 m | 138″ | Single | USA | Starfire Optical Range; New Mexico | 1994 |  |
WIYN Telescope | 3.5 m | 138″ | Single | USA | Kitt Peak National Obs., USA | 1994 |  |
Astrophysical Research Consortium (ARC) | 3.48 m | 137″ | Single | USA | Apache Point Obs.; Sacramento Peak, New Mexico | 1994 |
Infrared Telescope Facility (IRTF) | 3.2 m | 126″ | Single IR | United States | Mauna Kea, Hawaii | 1979 |
Shane Telescope | 3.05 m | 120″ | Single | United States | Lick Observatory; Mt. Hamilton, California | 1959 |  |
NASA-LMT (NODO)[5] retired | 3 m | 118″ | Liquid | USA | Sacramento Peak, New Mexico, USA | 1995–2002 |
Harlan J. Smith Telescope | 2.72 m | 107″ | Single | USA | McDonald Observatory, Texas, USA | 1969- |  |
UBC-Laval LMT | 2.65 m | 104″ | Liquid | Canada | Vancouver, Canada | 1992– |
Shajn 2.6m (Crimean 102 in)[6] | 2.64 m | 103″ | Single | | Crimean Astrophysical Obs., Ukraine | 1961 |
BAO 2.6 | 2.6 m | 102″ | Single | | Byurakan Astrophysical Obs.; Mt. Aragatz, Armenia | 1976 |
Nordic Optical Telescope (NOT) | 2.56 m | 101″ | Single | Denmark, Sweden, Iceland, Norway, Finland | La Palma, Canary Islands | 1988 |  |
Isaac Newton Telescope (INT) | 2.54 m | 100″ | Zerodur | UK | La Palma, Canary Islands moved/new mirror | 1984 |  |
du Pont | 2.54 m | 100″ | Single | USA | Las Campanas Observatory, Chile | 1976 |
Hooker 100-Inch Telescope | 2.54 m | 100″ | Single | United States | Mt. Wilson Observatory; California | 1917 |
Sloan DSS | 2.5 m | 98″ | Single | United States | Sacramento Peak, New Mexico | 1997 |
Isaac Newton Telescope (INT) | 2.54 m | 98″ | Single | UK | RGO, Sussex, England (original) | 1965–1979 |
Hiltner Telescope[7] | 2.4 m | 95″ | Single | United States | MDM Observatory, Kitt Peak, Arizona | 1986 |
Hubble (HST) | 2.4 m | 94″ | Single | NASA+ESA | Low Earth orbit | 1990 |
Vainu Bappu[8] | 2.34 m | 92″ | Single | | Vainu Bappu Observatory, India | 1986 |
WIRO 2.3 | 2.3 m | 90.5″ | Single | USA | Wyoming, USA | 1977 |
ANU 2.3m ATT[9] | 2.3 m | 90″ | Single | Australia | Siding Spring Obs., Australia | 1984 |
Bok Telescope (90-inch) | 2.3 m | 90″ | Single | USA | Steward Obs., Kitt Peak, Arizona | 1969 |
University of Hawaii 2.2 m[10] | 2.24 m | 88″ | Single | USA | Mauna Kea Observatories, Hawaii | 1970[10] |
MPIA-ESO (ESO-MPI) | 2.2 m | 87″ | Single | West Germany | Cerro La Silla, Chile | 1984[11] |
MPIA-CAHA 2.2m[11][12] | 2.2 m | 87″ | Single | West Germany | Calar Alto Observatory, Spain | 1979 |
Xinglong 2.16m[13] | 2.16 m | 85″ | Single | PRC (China) | Xinglong, China | 1989 |
Jorge Sahade 2.15m[14] | 2.15 m | 84″ | Single | | Leoncito Astronomical Complex, Argentina | 1987 |
INAOE 2.12 (OAGH)[15] | 2.12 m | 83″ | Single | Mexico, USA | Guillermo Haro Observatory; Sonora | 1987 |
UNAM 2.12 | 2.12 m | 83" | Single | | NAO; San Pedro, Mexico | 1979 |
Kitt Peak 2.1-meter | 2.1 m | 83″ | Single | USA | Kitt Peak (KNPO), USA | 1964 |
Otto Struve Telescope | 2.1 m | 82 | Single | USA | McDonald Observatory, USA | 1939 |
Himalayan Chandra Telescope (HCT)[16] | 2.01 m | 79″ | Single | India | Indian Astronomical Obs., Hanle (4500 m) | 2000 |
Alfred Jensch Teleskop | 2 m | 79″ | Single | | Karl Schwarzschild Observatory | 1960 |
Carl Zeiss Jena | 2 m | 79″ | Single | | Shamakhi Astrophysical Obs., Azerbaijan | 1966 |
Ondřejov 2-m | 2 m | 79″ | Single | Czechoslovakia | Ondřejov Observatory, Czechia | 1967 |  |
Ritchey-Chretien-Coude (RCC)[17] | 2 m | 79″ | Single | | Rozhen Observatory, Bulgaria | 1984 |
Carl Zeiss Jena | 2 m | 79″ | Single | | Main Ukraine Obs. | |
Bernard Lyot Telescope | 2 m | 79″ | Single | France | Pic du Midi Obs., France | 1980 |  |
Faulkes Telescope South | 2 m | 79″ | Single | UK | Siding Spring Obs., Australia | 2001 |  |
MAGNUM[18] | 2 m | 79″ | Single IR | Japan | Haleakala Obs., USA | 2001 |
OHP 1.93 | 1.93 m | 76″ | Single | France | Haute-Provence Observatory, France | 1958 |
74-inch Radcliffe Telescope (1.9 m)[19] | 1.88 m | 74″ | Single | | South African Astronomical Obs., Sutherland, 1974–Present Radcliffe Obs.,1948– 1974[19] | 1950 |
188 cm telescope[20] | 1.88 m | 74″ | Single | Japan | Okayama Astrophysical Observatory, Japan | 1960 |
DDO 1.88 m | 1.88 m | 74″ | Single | Canada | David Dunlap Observatory, Ontario | 1935 |
74" reflector[21] | 1.88 m | 74″ | Single | Australia | Mount Stromlo Observatory, Australia | 1955–2003 |
Kottamia telescope 1.88 m[22][23] | 1.88 m | 74″ | Single | Egypt | Egypt | 1960 |
Vatican Advanced Technology Telescope (VATT) | 1.83 m | 72″ | Single | Vatican City | Mt. Graham International Obs., Arizona | 1993[24] |
72-Inch Perkins Telescope | 1.83 m | 72″ | Single | USA | Lowell Observatory, Anderson Mesa USA | 1964 |
Plaskett telescope[25] | 1.83 m | 72″ | Single | Canada | Dominion Astrophysical Observatory, Canada | 1918 |
Copernico 182 cm[26] | 1.82 m | 72″ | Single | Italy | Asiago Observatory, Italy (1350 m) | 1973 |
1.8m Ritchey Cretien reflector[27] | 1.8 m | 72″ | Single | Korea | Bohyunsan Optical Astronomy Observatory, Korea | 1996 |
Sandy Cross Telescope[28] | 1.8 m | 71″ | Single | Canada | Rothney Astrophysical Observatory | 1996 |
Spacewatch 1.8-meter Telescope[29] | 1.8 m | 71″ | Single | USA | Kitt Peak National Observatory, USA | 2001 |
69-inch Perkins Telescope[30] | 1.75 m | 69″ | Single | USA | Perkins Observatory, Ohio | 1931–1964 |
165 cm telescope | 1.65 m | 65″ | Single | | Moletai Astronomical Obs., Lithuania | 1991 |
McMath–Pierce Solar Telescope | 1.61 m | 63″ | Single | USA | Kitt Peak National Obs., USA | 1962 |  |
AZT-33[31] | 1.6 m | 63″ | Single | | Sayan Solar Obs., Siberia (2000m) | 1981 |
1.6 m Perkin Elmer[32] | 1.6 m | 63″ | Single | Brazil | Pico dos Dias Observatory | 1981 |
1.6 | 1.6 m | 63″ | R/C | Canada | Mont Mégantic Observatory, Canada | 1978 |
Kaj Strand Telescope[33] | 1.55 m | 61″ | Single | USA | USN Obs. Flagstaff Station, USA | 1964 |
61" Kuiper Telescope | 1.55 m | 61″ | Single | USA | Steward Obs., Mt. Bigelow, USA | 1965[34] |
Oak Ridge Observatory 61" reflector[35] (Wyeth) | 1.55 m | 61″ | Single | USA | Oak Ridge Observatory, Massachusetts, USA | 1933–2005[36] |
Estación Astrofísica de Bosque Alegre[37] | 1.54 m | 60.6″ | Single | Argentina | Estación Astrofísica de Bosque Alegre, Argentina | 1942 |
Danish 1.54 meter telescope[38] | 1.54 m | 60.6″ | Single | Denmark | La Silla Observatory, Chile | 1979 |
Harvard 60-inch Reflector[39] | 1.524 m | 60″ | Single | United States | Harvard College Observatory, USA | 1905–1931 |
60-Inch Telescope | 1.524 m | 60″ | Single | United States | Mt. Wilson Observatory; California | 1908 |  |
Dunn Solar Telescope ex-VTT | 1.524 m | 60″ | Single | USA | National Solar Obs.-Sacramento Peak, USA | 1969 |
Palomar Observatory 60-inch[40] | 1.524 m | 60″ | Single | USA | Palomar Observatory, California, USA | 1970 |
FLWO 1.5m Tillinghast[41] | 1.52 m | 60″ | Single | United States | F. L. Whipple Obs., Arizona | 1994 |
Telescopio Carlos Sánchez (TCS) | 1.52 m | 60″ | Single | UK + Spain | Teide Observatory, Tenerife (Spain) | 1971 |
OHP 1.52 | 1.52 m | 60″ | Single | France | Haute-Provence Obs., France | 1967 |
Mt. Lemmon 60" Telescope[42] | 1.52 m | 60″ | Single | USA | Steward Observatory, Mount Lemmon, USA | 1970 |
OAN 1.52 m[43] | 1.52 m | 60″ | Single | Spain | Calar Alto Observatory, Spain | 1970s |
152 cm G.D. Cassini[44] | 1.52 m | 60″ | Single | Italy | Mount Orzale, Italy | 1976 |
TIRGO (Gornergrat Infrared Telescope)[45] | 1.50 m | 59″ | Single IR | Italy + Switzerland | Hochalpine Forschungsstation Jungfraujoch und Gornergrat, Alps, Switzerland (3150 m) | 1979–2005 |
AZT-22[46] | 1.5 m | 59″ | Single | USSR, Uzbekistan | Mount Maidanak, Uzbekistan | 1972 |
AZT-20[47] | 1.5 m | 59″ | Single | | Assy-Turgen Observatory, Kazakhstan[48] | |
AZT-12[49] | 1.5 m | 59″ | Single | USSR, Estonia | Tartu Observatory, Estonia | 1976 |
RTT-150[50] | 1.5 m | 59″ | Single | Russia, Turkey | TÜBİTAK National Observatory, Turkey | 2001 |
OSN 1.5m (Nasmyth)[51] | 1.5 m | 59″ | Single | Spain | Sierra Nevada Obs., Spain (2896 m) | 1991 |
BST-1M[52] | 1.5 m | 59″ | Single IR | USSR | Salyut 6, Earth Orbit | 1977–1982 |
USNOFS 1.3m[53] | 1.3 m | 51″ | Single | USA | USN Obs. Flagstaff Station, USA | 1998 |
Warsaw Telescope[54] | 1.3 m | 51″ | Single | Poland | Las Campanas Obs., Chile | 1996 |
Skinakas 1.3m Telescope[55] |
1.3 m |
51'' |
Single |
Greece |
Skinakas Obs., Greece |
1995 |
McGraw-Hill Telescope[56][57] | 1.27 m | 50″ | Single | USA | MDM Observatory, Arizona (1975–Present) Stinchfield Woods, Michigan (1969–1975) | 1969 |
Great Melbourne Telescope[58] (refit) | 127 cm | 50″ | Single | Australia | Mount Stromlo Observatory, Australia | 1961–1973[59] 1992–2003[60] |
AZT-11[61] | 1.25 m | 49″ | Single | | Abastumani Obs., Georgia (country) | 1976 |
AZT-11[62] | 1.25 m | 49″ | Single | | Crimean Astrophysical Obs., Ukraine | 1981 |
MPIA 1.2[63] | 1.23 m | 48.4″ | Single | West Germany + Spain | Calar Alto Obs., Spain | 1975 |
Babelsberg Zeiss[64] | 1.25 m | 49″ | Single | Germany, USSR | Babelsberg Observatory; Berlin, Germany, Crimean Astrophysical Observatory (1952–present) | 1924 |
Galileo 122 cm[65] | 1.22 m | 48″ | Single | Italy | Asiago Observatory, Italy | 1942 |
Samuel Oschin telescope | 1.22 m | 48″ | Schmidt | USA | Palomar Observatory; California | 1948 |
OHP 1.20 | 1.2 m | 48″ | Single | France | Haute-Provence Obs., France | 1943 |
Paris 48″ Reflector | 1.2 m | 48″ | | France | Paris Observatory, France | 1871–1943 |
Great Melbourne Telescope[58] | 122 cm | 48″ | reflector – metal | Australia | Melbourne Observatory, Australia | 1878–1944[59] |
Oskar-Lühning Telescope[66] | 1.2 m | 47″ | Single | Germany | Hamburg Observatory, Germany | 1975 |
Leonhard Euler Telescope[67] | 120 cm | 47″ | Single | Switzerland | La Silla, Chile | 1998 |
Mercator Telescope | 120 cm | 47″ | Single | Belgium+Switzerland | ORM; La Palma, Canary Islands | 2001[68] |
Hamburg Robotic Telescope (HRT)[69] | 120 cm | 47″ | Single | Germany | Hamburg-Bergdorf Obs., Germany | 2002* |
Hänssgen's reflector[70] | 107 cm | 42″ | Single | Germany | Mobile (~Germany) | 2002* |
|
Omicron@C2PU |
104 cm |
41" |
Single |
France |
Observatoire de la Côte d'Azur – Calern site, France, IAU code: 010 |
2013 |
|
Epsilon@C2PU |
104 cm |
41" |
Single |
France |
Observatoire de la Côte d'Azur – Calern site, France, IAU code: 010 |
2015 |
|
Grubb Parsons 40-inch | 102 cm | 40″ | Single | Sweden | Stockholm Observatory in Saltsjöbaden | 1930–present |
Nickel Telescope | 102 cm | 40″ | Single | USA | Lick Observatory, USA | 1979 |  |
Grubb 40-inch | 102 cm | 40" | Single | USSR | Crimean Astrophysical Observatory Simeiz (destroyed in WWII) | 1925–1944 |
George Ritchey 40-inch (1 m)[71] | 102 cm | 40″ | R/C | USA | Flagstaff, Arizona (Washington, D.C. until 1955), USA | 1934 |
Yerkes "41-inch"[72] | 102 cm | 40″ | Single | USA | Yerkes Observatory, USA | 1968[73] |
Meudon Observatory 1m[74] | 100 cm | 39.4″ | Single | France | Meudon Observatory/ Paris Observatory | 1891[75] |
ZIMLAT[76] | 100 cm | 39.4″ | Single | Switzerland | Zimmerwald Obs., Switzerland | 1997 |
OGS Telescope[77] | 100 cm | 39.4″ | Single | European Space Agency countries | Teide Observatory, Tenerife, Spain | 1995 |
Jacobus Kapteyn Telescope | 100 cm | 39.4″ | Single | UK + Netherlands | Isaac Newton Group, Canary Islands | 1984 |  |
Lulin One-meter Telescope (LOT)[78] | 100 cm | 39.4″ | Single | ROC (Taiwan) | Lulin Observatory, Taiwan | 2002* |
Zeiss di Merate (1m reflector) | 100 cm | 39.4″ | Single | Kingdom of Italy | Merate Obs., Merate, Italy | 1926 |  |
Zeiss 1m reflector | 100 cm | 39.4″ | Single | Belgium | Royal Obs., Uccle, Belgium | 1920s |
Hamburg Spiegelteleskop (1m reflector)[79][80] | 100 cm | 39.4″ | Single | Deutsches Reich (Germany) | Hamburg-Bergdorf Obs., Germany | 1911 |  |
1-m Carl Zeiss Jena | 100 cm | 39.4″ | Single | CCCP | Assy-Turgen Observatory, Kazakhstan[48] | |
James Gregory Telescope | 94 cm | 37" | SCT | Great Britain | University of St Andrews, UK | 1962 |  |
Schmidt 92/67 cm[81] | 92 cm | 36″ | Schmidt | Italy | Cima Ekar Observatory, Asiago, Italy (1360 m) | 1966 |
Kuiper Airborne Obs.(KAO) | 91.4 cm | 36″ | Single | USA | C-141 (mobile) | 1974–1995 |
Stratoscope 2 | 91.4 cm | 36″ | Single | USA | Balloon (mobile) | 1961–1973 |
Crossley Reflector[82] | 91.4 cm | 36″ | Single | US+UK | Lick Observatory, USA | 1896[83] |  |
36-inch Yapp reflector | 91.44 cm | 36″ | Reflector | UK | Greenwich & Herstmonceux | 1932[84] |  |