List of large optical telescopes

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This is a list of large optical telescopes. For telescopes larger than 3 meters in aperture see List of largest optical reflecting telescopes. This list combines large or expensive reflecting telescopes from any era, as what constitutes famous reflector has changed over time. In 1900 a 1-meter reflector would be among the largest in the world, but by 2000, would be relatively common for professional observatories.

Contents

Large reflectors and catadioptric

See List of largest optical reflecting telescopes for continuation of list to larger scopes

NameImage Aperture Mirror
type		Nationality / SponsorsSiteBuilt
Harlan J. Smith Telescope 107-inch at dusk.JPG 2.72 m (107 in)SingleUSA McDonald Observatory, Texas, USA1969
UBC-Laval LMT2.65 m (104 in) Liquid CanadaVancouver, British Columbia, Canada1992–2016 [1]
Shajn 2.6m
"Crimean 102 in." [2] 		CraO main telescope.jpg 2.64 m (104 in)Single Crimean Astrophysical Obs., Russia/Ukraine1961
VLT Survey Telescope (VST) [3] Tel view1.jpg 2.61 m (102.8 in)SingleItaly + ESO countries Paranal Observatory, Antofagasta Region, Chile2007
BAO 2.62.6 m (102 in)Single Byurakan Astrophysical Obs., Mt. Aragatz, Armenia1976
Nordic Optical Telescope (NOT) Nordic Optical Telescope La Palma.jpg 2.56 m (101 in)SingleDenmark, Sweden, Iceland, Norway, Finland ORM, Canary Islands, Spain1988
Javalambre Survey Telescope (JAST/T250) [4] 2.55 m (100 in)SingleInternational Javalambre Observatory, Spain (Z32)TBA
Isaac Newton Telescope (INT) Isaac Newton Telescope, La Palma, Spain.jpg 2.54 m (100 in)SingleUK ORM, Canary Islands, Spain (RGO, England, UK until '79)1984
Irenee du Pont Telescope Du Pont Las Campanas.jpg 2.54 m (100 in)SingleUSA Las Campanas Observatory, Coquimbo Region, Chile1976
Hooker 100-Inch Telescope 100inchHooker.jpg 2.54 m (100 in)SingleUSA Mt. Wilson Observatory, California, USA1917
Kawkasskaja gornaja observatory GAISCH MGU2.5 m (98.4 in)SingleRussia Caucasian mountain observatory  [ ru ], Russia2014
SOFIA SOFIA in air.jpg 2.5 m (98.4 in)SingleUSA + Germany Boeing 747SP (mobile, USA)2007
Sloan DSS 2.5 m (98.4 in)SingleUSA Apache Point Observatory, New Mexico, USA1997
Hiltner Telescope MDM Hiltner Telescope.jpg 2.4 m (94.5 in)SingleUSA MDM Observatory (Kitt Peak), Arizona, USA1986
Thai National Telescope (TNT)2.4 m (94.5 in)SingleThailand + SEAAN Thai National Observatory, Doi Inthanon, Thailand2013
Lijiang [5] 2.4 m (94.5 in)SingleChina Yunnan Astronomical Observatory, China2008
Hubble (HST) HST-SM4.jpeg 2.4 m (94.5 in)Single NASA+ESA Low Earth orbit 1990
2.4-meter SINGLE Telescope Magdalena Observatory.JPG 2.4 m (94.5 in)SingleUSA Magdalena Ridge Observatory, New Mexico, USA2006/2008
Automated Planet Finder Automated Planet Finder Dome.JPG 2.4 m (94.5 in)SingleUSA Lick Observatory, California, USA2010
Vainu Bappu [6] [7] 2.34 m (92.1 in)SingleIndia Vainu Bappu Observatory, Tamil Nadu, India1986
Aristarchos Aristarchos telescope.jpg 2.3 m (90.6 in)Single ESO Countries + Greece Chelmos Observatory, Greece2004
WIRO 2.3 [8] WyomingInfraRedObservatory.jpg 2.3 m (90.6 in)Single IRUSA Wyoming Infrared Observatory, Wyoming, USA1977
ANU 2.3m ATT [9] 2.3 m (90.6 in)Single Siding Spring Observatory, New South Wales, Australia1984
Bok Telescope (90-inch) Bokscope.jpg 2.3 m (90.6 in)SingleUSA Kitt Peak National Observatory, Arizona, USA1969
University of Hawaii 2.2 m (UH88) UH88 at sunset.jpg 2.24 m (88.2 in)SingleUSA Mauna Kea Observatories, Hawaii, USA1970
MPIA-ESO (ESO-MPI)2.2 m (86.6 in)Single West Germany La Silla Observatory, Coquimbo Region, Chile1984 [10]
MPIA-CAHA 2.2m [10] [11] Calar alto.JPG 2.2 m (86.6 in)Single West Germany Calar Alto Observatory, Almería, Spain1979
Xinglong 2.16m [12] 2.16 m (85.0 in)Single PRC (China) Xinglong, China1989
Jorge Sahade 2.15m [13] Telescopio del Complejo astronomico el Leoncito-San Juan-ARG.JPG 2.15 m (84.6 in)Single Leoncito Astronomical Complex, San Juan Province, Argentina1987
INAOE 2.12 (OAGH) [14] 2.12 m (83.5 in)SingleMexico + USA Guillermo Haro Observatory, Sonora, Mexico1987
UNAM 2.12 2.12m Telescope-SanPedroMartir Observatory-BajaCalifornia-Mexico.jpg 2.12 m (83.5 in)Single National Astronomical Observatory, Baja California, Mexico1979
Fraunhofer-Teleskop Wendelstein Fraunhofer Reflector.jpg 2.1 m (83 in)GerObservatorium Wendelstein, Deutschland2012
Kitt Peak 2.1-meter KPNO 2.1m (Crop from At Kitt Peak National Observatory).jpg 2.1 m (82.7 in)SingleUSA Kitt Peak National Observatory, Arizona, USA1964
Otto Struve Telescope Otto Struve Telescope.jpg 2.08 m (81.9 in)SingleUSA McDonald Observatory, Texas, USA1939
T13 Automated Spectroscopic Telescope [15] 2.06 m (81.1 in)SingleUSA (NASA, NSF, & TSU)Fairborn Observatory, Arizona, USA2003
Himalayan Chandra Telescope (HCT) [16] Hanle observatory.jpg 2.01 m (79.1 in)Single Indian Astronomical Observatory, India2000
Alfred Jensch Teleskop Karl-Schwarzschild-Observatorium.jpg 2 m (78.7 in)SingleGer Karl Schwarzschild Observatory, Germany1960
Carl Zeiss Jena2 m (78.7 in)Single Shamakhi Astrophysical Obs., Azerbaijan1966
Ondřejov 2-m [17] 2-m Telescope3, Ondrejov Astronomical.jpg 2 m (78.7 in)Single Czechoslovakia Ondřejov Observatory, Czech1967
Ritchey-Chretien-Coude (RCC) [18] Rozhen dome.jpg 2 m (78.7 in)SingleBulgaria Rozhen Observatory, Bulgaria1984
Carl Zeiss Jena2 m (78.7 in)SingleUkraine, Russia Peak Terskol Observatory  [ ru ], Russia1995
Bernard Lyot Telescope Telescope Bernard Lyot.jpg 2 m (78.7 in)SingleFrance Pic du Midi Obs., France1980
Liverpool Telescope [19] Liverpool Telescope facility exterior.jpg 2 m (78.7 in)SingleUK ORM, Canary Islands, Spain2003
Faulkes Telescope North EZL-Faulkes.jpg 2 m (78.7 in)SingleUK Haleakala Observatory, Hawaii, USA2003 [20]
Faulkes Telescope South 2 m (78.7 in)SingleUK Siding Spring Observatory, New South Wales, Australia2001
NAYUTA 2 m (78.7 in)SingleJapan Nishi-Harima Observatory, Hyogo, Japan2004
MAGNUM [21] 2 m (78.7 in)Single IRJapan Haleakala Observatory, Hawaii, USA2001–2008

Selected telescopes below about 2 meters aperture

A non-comprehensive non-exclusionary list of telescopes one yard to less than 2 metres in aperture.

Name Aperture
m		Aper.
in		 Mirror type Nationality
of Sponsors		SiteBuilt
OHP 1.931.93 m76″SingleFrance Haute-Provence Observatory, France1958
74 inch (1.9 m) Radcliffe Telescope [22] 1.88 m74″Single South African Astronomical Observatory
Sutherland (1974–present)
Radcliffe Observatory, Pretoria, South Africa (1948– 1974) [23] 		1950
1.88 m telescope [24] 1.88 m74″SingleJapan Okayama Astrophysical Observatory, Japan1960
DDO 1.88 m1.88 m74″SingleCanada David Dunlap Observatory, Ontario, Canada1935
74" reflector [25] 1.88 m74″SingleAustralia Mount Stromlo Observatory, Australian Capital Territory, Australia1955–2003
Kottamia telescope 1.88 m [26] [27] 1.88 m74″SingleEgyptEgypt1960
SETI Optical Telescope1.83 m72″SingleUSA Oak Ridge Observatory, Massachusetts, USA2006 [28]
Vatican Advanced Technology Telescope (VATT)1.83 m72″SingleVatican City Mount Graham International Observatory, Arizona, USA1993 [29]
72-Inch Perkins Telescope1.83 m72″SingleUSA Lowell Observatory, Arizona, USA1964
Plaskett telescope [30] 1.83 m72″SingleCanada Dominion Astrophysical Observatory, British Columbia, Canada1918
Leviathan of Parsonstown 1.83 m72″ Metal Great Britain Birr Castle; Ireland
Historical recreation		1845
Copernico 1.82 m [31] 1.82 m72″SingleItaly Asiago Observatory, Italy1976
1.8 meter telescope [32] 1.80 m71″SingleChinaGaomeigu site of Yunnan Astronomical Observatory, China2009
Pan-STARRS PS1 [33] [34] 1.8 m71″SingleGermany, Taiwan, US, UK Haleakala Observatory, Hawaii, USA2007
VLT Auxiliary Telescopes (1.8 x 4)1.80 m71″SingleEurope Paranal Observatory, Antofagasta Region, Chile2006
Spacewatch 1.8-meter Telescope [35] 1.80 m71″SingleUSA Kitt Peak National Observatory, Arizona, USA2001
1.8m Ritchey Cretien reflector [36] 1.80 m72″Single Korea Bohyunsan Optical Astronomy Observatory, Korea1996
Sandy Cross Telescope [37] 1.80 m71″SingleCanada Rothney Astrophysical Observatory, Alberta, Canada1996
Largest amateur telescope in 2013 [38] 1.778 m70″SingleUSAUtah, USA (mobile)2013
69-inch Perkins Telescope [39] 1.75 m69″SingleUSA Perkins Observatory, Ohio, USA1931–1964
1.65 m telescope1.65 m65″Single Molėtai Astronomical Obs., Lithuania1991
McMath–Pierce solar telescope 1.61 m63″SingleUSA Kitt Peak National Observatory, Arizona, USA1962
BBO NST1.60 m63″SolarUSA Big Bear Solar Observatory, California, USA2009
AZT-33 [40] 1.60 m63″Single Sayan Solar Observatory  [ ru ], Siberia, Russia1981
1.6 m Perkin Elmer [41] 1.60 m63″Single Brazil Pico dos Dias Observatory, Minas Gerais, Brazil1981
Observatoire du Mont-Mégantic1.60 m63″Single IRCanada Mont Mégantic Observatory, Québec, Canada1978
1.56m optical telescope1.56 m62″SingleChina Shanghai Astronomical Observatory, China1988
Kaj Strand Telescope [42] 1.55 m61″SingleUSA USNO Flagstaff Station, Arizona, USA1964
61" Kuiper Telescope1.55 m61″SingleUSA Steward Observatory, Arizona, USA1965 [43]
Oak Ridge Observatory 61" reflector [44] 1.55 m61″SingleUSA Oak Ridge Observatory, Massachusetts, USA1933
Estación Astrofísica de Bosque Alegre [45] 1.54 m60.6″SingleArgentina Estación Astrofísica de Bosque Alegre, Argentina1942
Toppo Telescope No.1 (TT1) [46] 1.537 m60.5″Single (R/C)Italy Astronomical Observatory of Castelgrande, Italy2008
Harvard 60-inch Reflector [47] 1.524 m60″SingleUSA Harvard College Observatory, Massachusetts, USA1905–1931
Hale 60-Inch Telescope 1.524 m60″SingleUSA Mt. Wilson Observatory, California, USA1908
Dunn Solar Telescope ex-VTT1.524 m60″SingleUSA National Solar Observatory, New Mexico, USA1969
FLWO 1.5m Tillinghast [48] 1.52 m60″SingleUSA F. L. Whipple Observatory, Arizona 1994
Telescopio Carlos Sánchez (TCS)1.52 m60″SingleUK + Spain Teide Observatory, Canary Islands, Spain1971
OHP 1.521.52 m60″SingleFrance Haute-Provence Obs., France1967
Mt. Lemmon 60" Dahl-Kirkham Telescope [49] 1.52 m60″Single IRUSA Steward Obs. (Mt. Lemmon), Arizona, USA1970
Steward Observatory 60" Cassegrain Telescope [50] 1.52 m60″SingleUSA Steward Obs. (Mt. Lemmon), Arizona, USA1960s
OAN 1.52 m [51] 1.52 m60″SingleSpain Calar Alto Observatory, Almería, Spain1970s
1.52 m G.D. Cassini [52] 1.52 m60″SingleItaly Mount Orzale, Italy1976
Leopold Figl Observatory [53] 1.50 m59″SingleAustriaMitterschöpfl, Vienna Woods Biosphere Reserve, Austria1970[ citation needed ]
TIRGO Gornergrat Infrared Telescope [54] 1.50 m59″Single IRItaly + SwitzerlandHochalpine Forschungsstation Jungfraujoch und Gornergrat, Alps, Switzerland1979–2005
AZT-22 [55] 1.50 m59″Single Mount Maidanak, Uzbekistan1972
RTT150 (ex-AZT-22) [56] [57] 1.50 m59″SingleRussia + Turkey TÜBİTAK National Obs., Turkey
AZT-20 [58] 1.50 m59″Single Assy-Turgen Observatory, Kazakhstan [59]
AZT-12 [60] 1.50 m59″Single Estonia Tartu Observatory, Estonia1976
Hexapod-Telescope (HPT) [61] 1.50 m59″SingleGermany Cerro Armazones Observatory, Antofagasta Region, Chile2005
OSN 1.5m (Nasmyth)1.50 m59″SingleSpain Sierra Nevada Observatory, Granada, Spain
Persona-1 (C.2441) [62] 1.50 m59″ Korsch RussiaEarth Orbit (SSO, terrestrial viewing)2008
GREGOR solar/night telescope [63] 1.50 m59″SingleGermany Teide Observatory, Tenerife, Spain2012
IRSF 1.4m [64] 1.40 mSingle Sutherland, South Africa Astronomical Observatory 2000
TCC [65] 1.40 mSingle38°10'12"N 20°36'36"E2010
ESO Coudé Auxiliary Telescope (CAT) [66] [67] 1.40 mSingle La Silla, Chile1981
SkyMapper 1.35 m53.15″SingleAustralia Siding Spring Observatory, New South Wales, Australia2008
USNOFS 1.3m [68] 1.30 m51″SingleUSA USNO Flagstaff Station, Arizona, USA1998
Skalnaté pleso Observatory [69] 1.30 mSingle Slovakia Skalnaté pleso Observatory, Astronomical Institute of Slovak Academy of Sciences, Slovakia 2014 [70]
Skinakas Obs. 1.3m 1.30 mSingleGreece Skinakas Observatory, Island of Crete, Greece1995
McGraw-Hill Telescope [71] [72] 1.27 m50″SingleUSA MDM Observatory, Arizona, USA (1975–present)
Dexter, Michigan, USA (1969–1975)		1969
1.26m infrared telescope1.26 m49.5"SingleChina Xinglong Station, China1991
Herschel 40-foot(1.26 m d.) [73] 1.26 m49.5″ Metal Great Britain + Ireland Observatory House; England1789–1815
AZT-11 [74] 1.25 m49″Single Abastumani Observatory, Rep. of Georgia1976
AZT-11 [75] 1.25 m49″Single Crimean Astrophysical Obs., Russia/Ukraine1981
MPIA 1.2 [76] 1.23 m48.4″Single West Germany+Spain Calar Alto Obs., Alemíra, Spain1975
T-1221.22 m48″SchmidtTurkey ÇOMÜ Ulupınar Observatory, Çanakkale, Turkey2002
Babelsberg Zeiss [77] 1.22 m48″SingleGermany Babelsberg Observatory, Berlin, Germany1924–1947
Galileo 1.22 m [78] 1.22 m48″SingleItaly Asiago Observatory, Italy1942
Samuel Oschin telescope 1.22 m48″ Schmidt USA Palomar Observatory, California, USA1948
Great Melbourne Telescope [79] 1.22 m48″ Metal Great Britain Melbourne Observatory, Victoria, Australia1878–1889
William Lassell 48-inch [80] 1.22 m48″ Metal Great BritainMalta1861–1865
Barabarella (OMI 48 inch) [81] [82] 1.22 m48″SingleUSA Lowrey Observatory, Texas, USA2008
Oskar-Lühning Telescope [83] 1.20 m47″SingleGermany Hamburg Observatory, Germany1975
Leonhard Euler Telescope [84] 1.20 m47″SingleSwitzerland La Silla Observatory, Coquimbo Region, Chile1998
Mercator Telescope 1.20 m47″SingleBelgium+Switzerland ORM, Canary Islands, Spain2001 [85]
Hamburg Robotic Telescope (HRT) [86] 1.20 m47″SingleGermany Hamburg-Bergdorf Obs., Germany2002
UK Schmidt Telescope 1.20 m47″ Schmidt UK Siding Spring Observatory, New South Wales, Australia1973
GeoEye-1 [87] 1.10 m43.3″SingleUSAEarth Orbit (terrestrial viewing)2008
Hänssgen's reflector [88] 1.07 m42″SingleGermanyMobile (~Germany)2002
KLENOT [89] 1.06 m42″Single Czech Republic Kleť Observatory, Czech Republic2002
Nickel Telescope 1.02 m40″SingleUSA Lick Observatory, California, USA1979
UTAS 40-inch1.02 m40" R/C Australia Mount Canopus, Tasmania, Australia1973
George Ritchey 40-inch (1 m) [90] 1.02 m40″ R/C USA USNO Flagstaff Station, Arizona, USA (Washington, D.C. until 1955)1934
Yerkes "41-inch" [91] 1.02 m40″SingleUSA Yerkes Observatory, Wisconsin, USA1968 [92]
ZIMLAT [93] 1.00 m39.4″SingleSwitzerland Zimmerwald Obs., Switzerland1997
Meudon Observatory 1m [94] 1.00 m39.4″SingleFranceMeudon Observatory/ Paris Observatory1891 [95]
Lulin One-meter Telescope (LOT) [96] [97] 1.00 m39.4"SingleTaiwan Lulin Observatory, Taiwan2002
Vihorlat national telescope [98] [99] 1.00 m39.4"single Slovakia Astronomical observatory on Kolonický mountain pass, Slovakia
Wise one-meter telescope1.00 m39.4"singleIsrael Wise Observatory, Israel1973
SAAO 1-meter Elizabeth Telescope1.00m39.4″SingleSouth Africa South African Astronomical Observatory
Cape Town, South Africa (1962-c.1975)
Sutherland, South Africa (c.1975–present)		1962
Near-Earth Object Survey Telescope (NEOST) [100] 1.00 m39.4"SingleChina Purple Mountain Observatory, China2006
RT 1.00 m1.00 m39.4″ TÜBİTAK National Observatory
OGS Telescope [101] 1.00 m39.4″Single European Space Agency countries Teide Observatory, Canary Islands, Spain1995
Jacobus Kapteyn Telescope 1.00 m39.4″SingleUK + Netherlands Isaac Newton Group, Canary Islands, Spain1984
Zeiss di Merate (1m reflector)1.00 m39.4″Single Kingdom of Italy Merate Obs., Merate, Italy1926
T1M1.00 m39.4″CassegrainFrance Lyon Observatory, Saint-Genis-Laval, France1970s
Zeiss 1m reflector1.00 m39.4″SingleBelgium Royal Obs., Uccle, Belgium
Hamburg Spiegelteleskop (1m reflector) [102] [103] 1.00 m39.4″Single Deutsches Reich (Germany) Hamburg-Bergdorf Obs., Germany1911
Kepler Mission telescope0.95 m37.4″SingleUSAEarth-trailing Orbit (Heliocentric)2009
James Gregory Telescope 0.94 m37"SingleGreat Britain University of St Andrews, Scotland, UK1962
Kuiper Airborne Obs.(KAO)0.914 m36″SingleUSA C-141 (mobile)1974–1995
Crossley Reflector [104] 0.914 m36″SingleUS+UK Lick Observatory, California, USA1896
A.A. Common Reflector0.914 m36″SingleGreat BritainGreat Britain1880–1896
Rosse 36-inch Telescope0.914 m36″ Metal Great Britain Birr Castle; Ireland1826
SMARTS 0.9m Telescope0.914 m36″SingleUSA, SMARTS Cerro Tololo Inter-American Observatory, Coquimbo Region, Chile1965
Spacewatch 0.9m Telescope0.914 m36″SingleUSA Steward Observatory enclave at Kitt Peak National Observatory, Arizona, USAContracted 1915, Completed 1921
Yapp telescope 0.914 m36″SingleU.K. Royal Observatory, Greenwich
+Herstmonceux		1934-1990

Selected telescopes below about 1 meter/yard aperture

Name Aperture
m		Aper.
in		 Type Nationality of SponsorsSiteBuilt/Used
Hopkins Ultraviolet Telescope 0.90 m35.4″Single UVUSAEarth Orbit1990, 1995
Potsdam Great Refractor (double refractor)0.80 m31.5 ″DoubletGermanyPotsdam, Germany1899
Optical Ground Station Oberpfaffenhofen [105] 0.80 m31.5 ″ R/C GermanyOberpfaffenhofen, Germany2022
Pine Mountain Observatory 32" [106] 0.82 m32"SingleUSA Pine Mountain Observatory, Pine Mountain, Oregon. 6300 feet elevation.1970
IAC800.82 m32"SingleSpain Teide Observatory, Canary Islands, Spain1993
JAST/T80 [107] 0.80 mSingleJavalambre Observatory, Spain (Z32)
Joan Oró telescope 0.80 m32" R/C Spain Montsec Astronomical Observatory, Catalonia. 5150 feet elevation.2008
UMBC Observatory 0.80 m32" R/C United States University of Maryland, Baltimore County, Baltimore, MD. 200 feet elevation1999
Astron [108] 0.80 m31.5″Single UVCCCP + FranceEarth orbit1983–1989 [108]
Ruisinger [109] 0.762 m30″Single-NewtonianUSA – ASKC Powell Observatory; Louisburg, Kansas 1985
Obsession Telescopes #102 [110] 0.762 m30″SingleUSA Omaha, Nebraska (mobile)1993
AKARI (ASTRO-F) [111] 0.685 m27″Single IRJapan + Misc.Earth Orbit2006–2011
William Lassell 24-inch [112] 0.61 m24″ Metal Great Britain Liverpool, England1845
Infrared Space Observatory 0.60 m23.5″Single IR (2.4 to 240) European Space Agency Earth orbit (GEO)1995–1998
TRAPPIST [113] 0.60 m23.5″SingleBelgium La Silla Observatory, Coquimbo Region, Chile2010 [114]
IRAS [115] 0.57 m22.44″Single IRUSA + UK + The NetherlandsEarth orbit1983
Antarctica Schmidt telescopes (AST3-1) [116] 0.50 m19.7″SingleChina Antarctic Kunlun Station 2012
Mars Reconnaissance Orbiter— HiRISE 0.50 m19.7″ R/C USAMars orbit2005
TacSat-2 [117] 0.50 m19.7″ R/C USAEarth orbit (terrestrial viewing)2006–2011
Uppsala Southern Schmidt Telescope 0.50 m19.7″SchmidtMultipleSweden / Australia1956–2013
Ege University- A48 Reflecting Cassegrain telescope0.48 m18.9″SingleTurkey Ege University Observatory, Izmir, Turkey1968
Herschel 20-foot (0.475 m d.) [118] [119] 0.475 m18.5″ Metal Great Britain Observatory House; England1782
Dutch Open Telescope (DOT)0.45 m17.7″ Solar Denmark ORM, Canary Islands1997
Explorer 57 (IUE) 0.45 m17.7″UVUS+UK+ESA CountriesEarth orbit (GEO)1978–1996
University of Rochester Telescope Project [120] 0.40 m16″ R/C USARochester NY (mobile)2011
Armagh 15- inch Grubb Reflector [121] 0.38 m15″ Metal Great Britain Armagh Observatory, Northern Ireland1835 [122]
TacSat-3 0.35 m14″ R/C USAEarth orbit (terrestrial viewing)2009–2012
Mars Global Surveyor —MOC [123] 0.35 m13.8″ R/C USAMars Orbit1996–2006
JHS Meade0.31 m12″S/CGermanyNEO (Near Earth Objects)2009
XMM-Newton —UV camera0.30 m11.9″Single UVESA CountriesEarth orbit1998
SWIFT UVOT0.30 m11.9″Single UVUS+ UK+ItalyEarth orbit2004
Hipparcos 0.29 m11.4″ Schmidt European Space Agency Earth orbit (GTO)1989–1993
CoRoT 0.27 m10.6″ afocal France + ESAEarth orbit2007
Centre for Basic Space Science Optical Telescopes [124] 0.25 m9.84″SingleNigeria NASRDA-CBSS Observatory, Nsukka 2006
Astronomical Netherlands Satellite 0.22 m8.7″Single UVThe Netherlands & USAEarth Orbit1974–1976
New Horizons —LORRI0.208 m8.2″ R/C USASpace (33+ AU from Earth)2006
Lunar Reconnaissance Orbiter LROC-NAC [125] 0.195 m7.68″ReflectorUSALunar orbit2009
Hadley's Reflector [126] 0.15 m6″MetalGreat BritainEngland (mobile)1721
Chinese Small Telescope Array (CSTAR)0.145 m6″SingleChina Antarctic Kunlun Station 2008
University of Tokyo PRISM [127] 0.10  m3.9″SingleJapanEarth Orbit (terrestrial viewing)2009
Newton's reflector [128] [129] 0.033 m1.3″MetalGreat BritainEngland (mobile)1669
MESSENGER MDIS-WAC [130] 0.03 m1.18″ Lens USASpace (Mercury orbit)2004
MESSENGER MDIS-NAC [131] 0.025 m0.98″R/CUSASpace (Mercury orbit)2004
Dawn Framing Camera (FC1/FC2) [132] 0.02 m0.8″LensGermany + USASpace (Asteroid belt)2007

See also

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The Hale Telescope is a 200-inch (5.1 m), f/3.3 reflecting telescope at the Palomar Observatory in San Diego County, California, US, named after astronomer George Ellery Hale. With funding from the Rockefeller Foundation in 1928, he orchestrated the planning, design, and construction of the observatory, but with the project ending up taking 20 years he did not live to see its commissioning. The Hale was groundbreaking for its time, with double the diameter of the second-largest telescope, and pioneered many new technologies in telescope mount design and in the design and fabrication of its large aluminum coated "honeycomb" low thermal expansion Pyrex mirror. It was completed in 1949 and is still in active use.

<span class="mw-page-title-main">South African Astronomical Observatory</span> Observatory

The South African Astronomical Observatory (SAAO) is the national centre for optical and infrared astronomy in South Africa. It was established in 1972. The observatory is run by the National Research Foundation of South Africa. The facility's function is to conduct research in astronomy and astrophysics. The primary telescopes are located in Sutherland, which is 370 kilometres (230 mi) from Observatory, Cape Town, where the headquarters is located.

<span class="mw-page-title-main">Mount Lemmon Observatory</span> Astronomical observatory in Arizona, United States

Mount Lemmon Observatory (MLO), also known as the Mount Lemmon Infrared Observatory, is an astronomical observatory located on Mount Lemmon in the Santa Catalina Mountains approximately 28 kilometers northeast of Tucson, Arizona (US). The site in the Coronado National Forest is used with special permission from the U.S. Forest Service by the University of Arizona's Steward Observatory, and contains a number of independently managed telescopes.

<span class="mw-page-title-main">Telescope</span> Instrument that makes distant objects appear magnified

A telescope is a device used to observe distant objects by their emission, absorption, or reflection of electromagnetic radiation. Originally, it was an optical instrument using lenses, curved mirrors, or a combination of both to observe distant objects – an optical telescope. Nowadays, the word "telescope" is defined as a wide range of instruments capable of detecting different regions of the electromagnetic spectrum, and in some cases other types of detectors.

<span class="mw-page-title-main">National Astronomical Observatory (Mexico)</span> Observatory in Baja California, Mexico

The National Astronomical Observatory is an astronomical observatory in Baja California, Mexico.

<span class="mw-page-title-main">Submillimeter Wave Astronomy Satellite</span> NASA satellite of the Explorer program

Submillimeter Wave Astronomy Satellite is a NASA submillimetre astronomy satellite, and is the fourth spacecraft in the Small Explorer program (SMEX). It was launched on 6 December 1998, at 00:57:54 UTC, from Vandenberg Air Force Base aboard a Pegasus XL launch vehicle. The telescope was designed by the Smithsonian Astrophysical Observatory (SAO) and integrated by Ball Aerospace, while the spacecraft was built by NASA's Goddard Space Flight Center (GSFC). The mission's principal investigator is Gary J. Melnick.

<span class="mw-page-title-main">Table Mountain Observatory</span> Astronomy facility in Big Pines, California

Table Mountain Observatory (TMO) is an astronomical observation facility operated by NASA's Jet Propulsion Laboratory. It is located in Big Pines, California, in the Angeles National Forest near Wrightwood, north-northeast of Los Angeles, California.

<span class="mw-page-title-main">Great refractor</span>

Great refractor refers to a large telescope with a lens, usually the largest refractor at an observatory with an equatorial mount. The preeminence and success of this style in observational astronomy defines an era in modern telescopy in the 19th and early 20th century. Great refractors were large refracting telescopes using achromatic lenses. They were often the largest in the world, or largest in a region. Despite typical designs having smaller apertures than reflectors, great refractors offered a number of advantages and were popular for astronomy. It was also popular to exhibit large refractors at international exhibits, and examples of this include the Trophy Telescope at the 1851 Great Exhibition, and the Yerkes Great Refractor at the 1893 World's Fair in Chicago.

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