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.
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Transcription
I’ve talked a lot about observing the night sky with your eyes; just simply going out and seeing what you can see. It’s pretty amazing what you can learn just by doing that, and of course that’s all we humans could do for thousands of years. But now we can do better. We can use telescopes. The first person to invent the telescope is lost to history; despite “common knowledge,” Galileo did not invent them. He wasn’t even the first person to point one at the sky, or the first person to publish results! But he was a loud and persistent voice over the years, and his amazing string of discoveries using his crude instrument landed him firmly in the history books. Aggressive self-marketing sometimes pays off. You might think the purpose of a telescope is to magnify small objects so we can see them better. That’s how a lot of telescopes are marketed, but to be honest that’s not exactly the case. If you want to be really general, the purpose of a telescope is to make things easier to see: To make the invisible visible, and to make the things already visible visible more clearly. A telescope works by gathering light. Think of it like a bucket in the rain: The bigger the bucket, the more rain you collect. If your bucket is big enough, you’ll get plenty of water even when it’s only sprinkling out. In the case of a telescope, the “bucket” is an optical device like a lens or a mirror that collects light. We call this device the objective, and the bigger the objective, the more light it collects. Look at your eyes… well, that’s tough, so let’s think about our eyes for a moment. They also work as light buckets, but they only collect light through our pupils, which even under the best of circumstances are less than a centimeter across; a very tiny bucket indeed. But we can do better. To extend the analogy, a telescope is like a bucket with a funnel at the bottom. All that light that it collects is then concentrated, focused, and sent into your eye. It turns a trickle of light into a torrent. The amount of light it collects depends on the area of the objective. That means if you double the diameter of the collector, you’d collect four times as much light, because the area of the collector goes up as the square of the radius. Make a bucket 10 times wider, and you collect 100 times as much light! Clearly, as telescopes get bigger their ability to show us faint objects increases enormously. In fact that was one of Galileo’s first and most important discoveries: Stars that were invisible to the naked eye were easily seen through his telescope, even though it only had a lens a few centimeters across. Those faint stars didn’t emit enough light for his eyes to see them, but when he increased his collecting area with a telescope, they popped into visibility. The primary way telescopes work is to change the direction light from an object is traveling. I can see a star with my eye because light from that star is sent in my direction, into my eye. But most of that light misses my eye, falling to the ground all around me. The telescope collects that light, bounces it around, and then channels it into my eye. When the very first telescopes were built, this changing of the direction of light was done using lenses. When light goes from one medium to another – say, from going through air to going through water or glass – it changes direction slightly. You see this all the time; a spoon sitting in a glass of water looks bent or broken. The spoon is doing just fine, but the light you see from it is getting bent, distorting the image. This bending is called refraction. The way light bends depends on what’s bending it (like water or glass) and the shape of the object doing the bending. It so happens that if you grind a piece of glass into a lens shape, it bends -- or refracts -- the incoming light in a cone, focusing it into a single spot. It’s a light funnel! This refraction has a couple of interesting results. For one thing, the light from the top of a distant object is bent down, and the light from the bottom is bent up. When this light comes to a focus, it means you see the object upside-down! It also flips left and right, which can be a little disconcerting, and takes getting used to when you’re using a refracting telescope. For another thing, the lens can magnify the image. That’s again because the light is bent, and the image created of object observed can appear larger than the object does by eye. It depends on a lot of factors including the shape of the lens, the distance to the object, and how far away the lens is, but in the end what you get is an image that looks bigger. That has obvious advantages; a planet like Jupiter is too far away to see as anything other than a dot to the eye, but a telescope makes it appear bigger, and details can then be seen. When Galileo and other early astronomers pointed their telescopes at the sky, multitudes were revealed: Craters on the Moon, the phases of Venus, Jupiter’s moons, the rings of Saturn, and so much more. The Universe itself came into focus. When astronomers talk about using a telescope to make details more clear, they use a term called resolution. This is the ability to separate two objects that are very close together. You’re familiar with this; when you’re driving on a road at night a distant car coming toward you appears as a single light. When it gets closer, the light separates out — resolves — into two headlights. A telescope increases resolution, making it easier to, say, split two stars that are close together, or to see details on the Moon’s surface. The resolution depends in part on the size of the objective; in general the bigger the telescope objective the better your resolution is. Resolution is more useful than magnification when talking telescopes. Fundamentally, there is a limit to how well your telescope resolves two objects, but there’s no limit to how much you can magnify the image. If you magnify the image beyond what the telescope can actually resolve, you just get mush. Refracting telescopes are great, but they suffer from a big problem: Big lenses are hard to make. They get thin near the edge, and break easily. Also, different colors of light bend by different amounts as they pass through the lens, so you might focus a red star, say, and a blue one will still look fuzzy. No less a mind than Isaac Newton figured a way around this: Use mirrors. Mirrors also change the direction light travels, and if you used a curved mirror you can also bring light rays to a focus. Telescopes that use mirrors are called reflectors. The advantages of reflectors are huge: You only have to polish one side of a mirror, where a lens has two sides. Also a mirror can be supported along its back, so they can be manufactured much larger more easily and for less money. Although there have been many improvements made over the centuries, most big modern telescopes at their heart are based on the Newtonian design, and in fact no large professional-grade telescopes made today have a lens as their objective. Nowadays, it’s all done with mirrors. And that brings us to this week’s aptly named Focus On. The most common question I’m asked (besides, “Hey, who does your hair?”) is, “Hey, Phil, kind of telescope should I buy?” It’s a legitimate question, but it’s very difficult to answer. Imagine someone walked up to you and asked, “What kind of car should I buy?” That’s impossible to answer without a lot more information. Same for telescopes. Do you want to look at the Moon and planets, or fainter, more difficult to spot galaxies? Are you really devoted to this, or is it more of a pastime? Is this for a child or an adult? These questions are critical. Most small ‘scopes are refractors, which are good for looking at detail on the Moon and planets (they tend to magnify the image more than reflectors do). But they’re tricky to use because they flip the image left and right and up and down. Bigger ‘scopes are good for fainter objects, but are more expensive, and can be difficult to set up and use. I hate hearing about a ‘scope that just collects dust because it was bought in haste. So here’s what I recommend: Find an observatory, planetarium, or local astronomy club. They’re likely to have star parties, public observing events, where you can look at and through different kinds of telescopes. Their owners are almost universally thrilled to talk about them — as an astronomer, I can assure that the problem with astronomers isn’t getting them to talk, it’s shutting them up — so you’ll get lots of great first-hand advice and experience. Also, I usually recommend getting binoculars before a telescope. They’re easy to use, fun to use, easy to carry around, and you can get good ones for less money and still see some nice things. Even if you decide not to get more into astronomy as a hobby, they can also be used during the day on hikes and for bird watching. I have a couple of pair of binoculars and I use them all the time. There’s a third aspect to telescopes that’s very important, beyond resolution and making faint things easier to see. They can literally show us objects outside of the range of colors our eyes can see. In the year 1800, William Herschel discovered infrared light, a kind of light invisible to our eyes. In the time since we’ve learned of other forms of invisible light: radio, microwave, ultraviolet, X-rays, and gamma rays. Astronomical objects can be observed in all these flavors of light, if we have telescopes that are designed to detect these flavors of light. Radio waves pass right around “normal” telescopes, ones that we use to observe visible light. X-rays and gamma rays pass right through them as if they aren’t even there. But we’re smart, we humans. We learned that giant metal dishes can and will bend radio waves, and can be formed just like gigantic Newtonian mirrored telescopes. In fact, different forms of light need different kinds of telescopes, and once we figured out how, we’ve built ‘em. We can now detect cosmic phenomena across the entire spectrum of light, from radio waves to gamma rays, and have even built unconventional telescopes that detect subatomic particles from space as well, such as neutrinos and cosmic rays. Because of this, we have learned far more about the Universe than Galileo could have imagined. And we’re in the midst of another revolution, too. The actual biophysics is complicated, but in a sense our eyes act like movie cameras, taking pictures at a frame rate of about 14 images per second. That’s a short amount of time. Photographs, though, can take far longer exposures, allowing the light to build up, allowing us to see much fainter objects. The first photographs taken through a telescope were done in the 1800s. This has led to innumerable discoveries; for example, in the 20th century giant telescopes with giant cameras revealed details in distant galaxies that led to our understanding that the Universe is expanding, a critically important concept that we’ll dive into later in the series. And now we have digital detectors, similar to the ones in your phone camera, but far larger and far more sensitive. They can be dozens of times more light-sensitive than film, able to detect in minutes objects that would’ve taken hours or more to see using film. These digital cameras can also be designed to detect ultraviolet light, infrared, and more. We can store vast amounts of that data easily on computers, and use those computers to analyze that huge ocean of information, performing tasks too tedious for humans. Most asteroids and comets are discovered using autonomous software, for example, looking for moving objects among the tens or hundreds of thousands of fixed stars in digital images. This has also ushered in the era of remote astronomy; a telescope can be on a distant mountain and programmed to scan the sky automatically. It also means we can loft telescopes into space, above the sea of air in our atmosphere that blurs and distorts distant, faint objects. We can visit other worlds and send the pictures and data back home, or put observatories like the Hubble Space Telescope into orbit around the Earth and have it peer into the vast depths of the Universe. I would argue that the past century has seen a revolution in astronomy every bit as important as the invention of the telescope in the first place. In the early 17th century the entire sky was new, and everywhere you pointed a telescope there was some treasure to behold. But with our huge telescopes and incredibly sensitive digital eyes now, that’s still true. We learn more about the Universe every day, just as we learn that there’s more to learn every day, too. That’s one of the best parts of being an astronomer; the Universe is like a jigsaw puzzle with an infinite number of pieces. The fun never ends. And remember: Even with all the wonders revealed by telescopes, your eyes are still pretty good instruments, too. You don’t need big fancy equipment to see the sky. The important thing is to go outside. Look up! That’s fun too. Today you learned that telescopes do two things: Increase our ability to resolve details, and collect light so we can see fainter objects. There are two main flavors of telescope: Refractors, which use a lens, and reflectors, which use a mirror. There are also telescopes that are used to look at light our eyes can’t see, and with the invention of film, and later electronic detectors, we have been able to probe the Universe to amazing depths. Crash Course is produced in association with PBS Digital Studios. This episode was written by me, Phil Plait. The script was edited by Blake de Pastino, and our consultant is Dr. Michelle Thaller. It was co-directed by Nicholas Jenkins and Michael Aranda, and the graphics team is Thought Café.
Large reflectors and catadioptric
See List of largest optical reflecting telescopes for continuation of list to larger scopes
Name | Image | Aperture | Mirror type |
Nationality / Sponsors | Site | Built |
---|---|---|---|---|---|---|
Harlan J. Smith Telescope | 2.72 m (107 in) | Single | USA | McDonald Observatory, Texas, USA | 1969 | |
UBC-Laval LMT | 2.65 m (104 in) | Liquid | Canada | Vancouver, British Columbia, Canada | 1992–2016[1] | |
Shajn 2.6m "Crimean 102 in."[2] |
2.64 m (104 in) | Single | Crimean Astrophysical Obs., Russia/Ukraine | 1961 | ||
VLT Survey Telescope (VST)[3] | 2.61 m (102.8 in) | Single | Italy + ESO countries | Paranal Observatory, Antofagasta Region, Chile | 2007 | |
BAO 2.6 | 2.6 m (102 in) | Single | Byurakan Astrophysical Obs., Mt. Aragatz, Armenia | 1976 | ||
Nordic Optical Telescope (NOT) | 2.56 m (101 in) | Single | Denmark, Sweden, Iceland, Norway, Finland | ORM, Canary Islands, Spain | 1988 | |
Javalambre Survey Telescope (JAST/T250)[4] | 2.55 m (100 in) | Single | International | Javalambre Observatory, Spain (Z32) | TBA | |
Isaac Newton Telescope (INT) | 2.54 m (100 in) | Single | UK | ORM, Canary Islands, Spain (RGO, England, UK until '79) | 1984 | |
Irenee du Pont Telescope | 2.54 m (100 in) | Single | USA | Las Campanas Observatory, Coquimbo Region, Chile | 1976 | |
Hooker 100-Inch Telescope | 2.54 m (100 in) | Single | USA | Mt. Wilson Observatory, California, USA | 1917 | |
Kawkasskaja gornaja observatory GAISCH MGU | 2.5 m (98.4 in) | Single | Russia | Caucasian mountain observatory | , Russia2014 | |
SOFIA | 2.5 m (98.4 in) | Single | USA + Germany | Boeing 747SP (mobile, USA) | 2007 | |
Sloan DSS | 2.5 m (98.4 in) | Single | USA | Apache Point Observatory, New Mexico, USA | 1997 | |
Hiltner Telescope | 2.4 m (94.5 in) | Single | USA | MDM Observatory (Kitt Peak), Arizona, USA | 1986 | |
Thai National Telescope (TNT) | 2.4 m (94.5 in) | Single | Thailand + SEAAN | Thai National Observatory, Doi Inthanon, Thailand | 2013 | |
Lijiang[5] | 2.4 m (94.5 in) | Single | China | Yunnan Astronomical Observatory, China | 2008 | |
Hubble (HST) | 2.4 m (94.5 in) | Single | NASA+ESA | Low Earth orbit | 1990 | |
2.4-meter SINGLE Telescope | 2.4 m (94.5 in) | Single | USA | Magdalena Ridge Observatory, New Mexico, USA | 2006/2008 | |
Automated Planet Finder | 2.4 m (94.5 in) | Single | USA | Lick Observatory, California, USA | 2010 | |
Vainu Bappu[6][7] | 2.34 m (92.1 in) | Single | India | Vainu Bappu Observatory, Tamil Nadu, India | 1986 | |
Aristarchos | 2.3 m (90.6 in) | Single | ESO Countries+ Greece | National Observatory of Athens, Mt. Helmos, Greece | 2004 | |
WIRO 2.3[8] | 2.3 m (90.6 in) | Single IR | USA | Wyoming Infrared Observatory, Wyoming, USA | 1977 | |
ANU 2.3m ATT[9] | 2.3 m (90.6 in) | Single | Siding Spring Observatory, New South Wales, Australia | 1984 | ||
Bok Telescope (90-inch) | 2.3 m (90.6 in) | Single | USA | Kitt Peak National Observatory, Arizona, USA | 1969 | |
University of Hawaii 2.2 m (UH88) | 2.24 m (88.2 in) | Single | USA | Mauna Kea Observatories, Hawaii, USA | 1970 | |
MPIA-ESO (ESO-MPI) | 2.2 m (86.6 in) | Single | West Germany | La Silla Observatory, Coquimbo Region, Chile | 1984[10] | |
MPIA-CAHA 2.2m[10][11] | 2.2 m (86.6 in) | Single | West Germany | Calar Alto Observatory, Almería, Spain | 1979 | |
Xinglong 2.16m[12] | 2.16 m (85.0 in) | Single | PRC (China) | Xinglong, China | 1989 | |
Jorge Sahade 2.15m[13] | 2.15 m (84.6 in) | Single | Leoncito Astronomical Complex, San Juan Province, Argentina | 1987 | ||
INAOE 2.12 (OAGH)[14] | 2.12 m (83.5 in) | Single | Mexico + USA | Guillermo Haro Observatory, Sonora, Mexico | 1987 | |
UNAM 2.12 | 2.12 m (83.5 in) | Single | National Astronomical Observatory, Baja California, Mexico | 1979 | ||
Fraunhofer-Teleskop | 2.1 m (83 in) | Ger | Observatorium Wendelstein, Deutschland | 2012 | ||
Kitt Peak 2.1-meter | 2.1 m (82.7 in) | Single | USA | Kitt Peak National Observatory, Arizona, USA | 1964 | |
Otto Struve Telescope | 2.08 m (81.9 in) | Single | USA | McDonald Observatory, Texas, USA | 1939 | |
T13 Automated Spectroscopic Telescope[15] | 2.06 m (81.1 in) | Single | USA (NASA, NSF, & TSU) | Fairborn Observatory, Arizona, USA | 2003 | |
Himalayan Chandra Telescope (HCT)[16] | 2.01 m (79.1 in) | Single | Indian Astronomical Observatory, India | 2000 | ||
Alfred Jensch Teleskop | 2 m (78.7 in) | Single | Ger | Karl Schwarzschild Observatory, Germany | 1960 | |
Carl Zeiss Jena | 2 m (78.7 in) | Single | Shamakhi Astrophysical Obs., Azerbaijan | 1966 | ||
Ondřejov 2-m[17] | 2 m (78.7 in) | Single | Czechoslovakia | Ondřejov Observatory, Czech | 1967 | |
Ritchey-Chretien-Coude (RCC)[18] | 2 m (78.7 in) | Single | Bulgaria | Rozhen Observatory, Bulgaria | 1984 | |
Carl Zeiss Jena | 2 m (78.7 in) | Single | Ukraine, Russia | Peak Terskol Observatory | , Russia1995 | |
Bernard Lyot Telescope | 2 m (78.7 in) | Single | France | Pic du Midi Obs., France | 1980 | |
Liverpool Telescope[19] | 2 m (78.7 in) | Single | UK | ORM, Canary Islands, Spain | 2003 | |
Faulkes Telescope North | 2 m (78.7 in) | Single | UK | Haleakala Observatory, Hawaii, USA | 2003[20] | |
Faulkes Telescope South | 2 m (78.7 in) | Single | UK | Siding Spring Observatory, New South Wales, Australia | 2001 | |
NAYUTA | 2 m (78.7 in) | Single | Japan | Nishi-Harima Observatory, Hyogo, Japan | 2004 | |
MAGNUM[21] | 2 m (78.7 in) | Single IR | Japan | Haleakala Observatory, Hawaii, USA | 2001–2008 |
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 |
Site | Built |
---|---|---|---|---|---|---|
OHP 1.93 | 1.93 m | 76″ | Single | France | Haute-Provence Observatory, France | 1958 |
74 inch (1.9 m) Radcliffe Telescope[22] | 1.88 m | 74″ | Single | South African Astronomical Observatory Sutherland (1974–present) Radcliffe Observatory, Pretoria, South Africa (1948– 1974)[23] |
1950 | |
1.88 m telescope[24] | 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, Canada | 1935 |
74" reflector[25] | 1.88 m | 74″ | Single | Australia | Mount Stromlo Observatory, Australian Capital Territory, Australia | 1955–2003 |
Kottamia telescope 1.88 m[26][27] | 1.88 m | 74″ | Single | Egypt | Egypt | 1960 |
SETI Optical Telescope | 1.83 m | 72″ | Single | USA | Oak Ridge Observatory, Massachusetts, USA | 2006[28] |
Vatican Advanced Technology Telescope (VATT) | 1.83 m | 72″ | Single | Vatican City | Mount Graham International Observatory, Arizona, USA | 1993[29] |
72-Inch Perkins Telescope | 1.83 m | 72″ | Single | USA | Lowell Observatory, Arizona, USA | 1964 |
Plaskett telescope[30] | 1.83 m | 72″ | Single | Canada | Dominion Astrophysical Observatory, British Columbia, Canada | 1918 |
Leviathan of Parsonstown | 1.83 m | 72″ | Metal | Great Britain | Birr Castle; Ireland Historical recreation |
1845 |
Copernico 1.82 m[31] | 1.82 m | 72″ | Single | Italy | Asiago Observatory, Italy | 1976 |
1.8 meter telescope[32] | 1.80 m | 71″ | Single | China | Gaomeigu site of Yunnan Astronomical Observatory, China | 2009 |
Pan-STARRS PS1[33][34] | 1.8 m | 71″ | Single | Germany, Taiwan, US, UK | Haleakala Observatory, Hawaii, USA | 2007 |
VLT Auxiliary Telescopes (1.8 x 4) | 1.80 m | 71″ | Single | Europe | Paranal Observatory, Antofagasta Region, Chile | 2006 |
Spacewatch 1.8-meter Telescope[35] | 1.80 m | 71″ | Single | USA | Kitt Peak National Observatory, Arizona, USA | 2001 |
1.8m Ritchey Cretien reflector[36] | 1.80 m | 72″ | Single | Korea | Bohyunsan Optical Astronomy Observatory, Korea | 1996 |
Sandy Cross Telescope[37] | 1.80 m | 71″ | Single | Canada | Rothney Astrophysical Observatory, Alberta, Canada | 1996 |
Largest amateur telescope in 2013[38] | 1.778 m | 70″ | Single | USA | Utah, USA (mobile) | 2013 |
69-inch Perkins Telescope[39] | 1.75 m | 69″ | Single | USA | Perkins Observatory, Ohio, USA | 1931–1964 |
1.65 m telescope | 1.65 m | 65″ | Single | Molėtai Astronomical Obs., Lithuania | 1991 | |
McMath–Pierce solar telescope | 1.61 m | 63″ | Single | USA | Kitt Peak National Observatory, Arizona, USA | 1962 |
BBO NST | 1.60 m | 63″ | Solar | USA | Big Bear Solar Observatory, California, USA | 2009 |
AZT-33[40] | 1.60 m | 63″ | Single | Sayan Solar Observatory | , Siberia, Russia1981 | |
1.6 m Perkin Elmer[41] | 1.60 m | 63″ | Single | Brazil | Pico dos Dias Observatory, Minas Gerais, Brazil | 1981 |
Observatoire du Mont-Mégantic | 1.60 m | 63″ | Single IR | Canada | Mont Mégantic Observatory, Québec, Canada | 1978 |
1.56m optical telescope | 1.56 m | 62″ | Single | China | Shanghai Astronomical Observatory, China | 1988 |
Kaj Strand Telescope[42] | 1.55 m | 61″ | Single | USA | USNO Flagstaff Station, Arizona, USA | 1964 |
61" Kuiper Telescope | 1.55 m | 61″ | Single | USA | Steward Observatory, Arizona, USA | 1965[43] |
Oak Ridge Observatory 61" reflector[44] | 1.55 m | 61″ | Single | USA | Oak Ridge Observatory, Massachusetts, USA | 1933 |
Estación Astrofísica de Bosque Alegre[45] | 1.54 m | 60.6″ | Single | Argentina | Estación Astrofísica de Bosque Alegre, Argentina | 1942 |
Toppo Telescope No.1 (TT1)[46] | 1.537 m | 60.5″ | Single (R/C) | Italy | Astronomical Observatory of Castelgrande, Italy | 2008 |
Harvard 60-inch Reflector[47] | 1.524 m | 60″ | Single | USA | Harvard College Observatory, Massachusetts, USA | 1905–1931 |
Hale 60-Inch Telescope | 1.524 m | 60″ | Single | USA | Mt. Wilson Observatory, California, USA | 1908 |
Dunn Solar Telescope ex-VTT | 1.524 m | 60″ | Single | USA | National Solar Observatory, New Mexico, USA | 1969 |
FLWO 1.5m Tillinghast[48] | 1.52 m | 60″ | Single | USA | F. L. Whipple Observatory, Arizona | 1994 |
Telescopio Carlos Sánchez (TCS) | 1.52 m | 60″ | Single | UK + Spain | Teide Observatory, Canary Islands, Spain | 1971 |
OHP 1.52 | 1.52 m | 60″ | Single | France | Haute-Provence Obs., France | 1967 |
Mt. Lemmon 60" Dahl-Kirkham Telescope[49] | 1.52 m | 60″ | Single IR | USA | Steward Obs. (Mt. Lemmon), Arizona, USA | 1970 |
Steward Observatory 60" Cassegrain Telescope[50] | 1.52 m | 60″ | Single | USA | Steward Obs. (Mt. Lemmon), Arizona, USA | 1960s |
OAN 1.52 m[51] | 1.52 m | 60″ | Single | Spain | Calar Alto Observatory, Almería, Spain | 1970s |
1.52 m G.D. Cassini[52] | 1.52 m | 60″ | Single | Italy | Mount Orzale, Italy | 1976 |
Leopold Figl Observatory[53] | 1.50 m | 59″ | Single | Austria | Mitterschöpfl, Vienna Woods Biosphere Reserve, Austria | 1970[citation needed] |
TIRGO Gornergrat Infrared Telescope[54] | 1.50 m | 59″ | Single IR | Italy + Switzerland | Hochalpine Forschungsstation Jungfraujoch und Gornergrat, Alps, Switzerland | 1979–2005 |
AZT-22[55] | 1.50 m | 59″ | Single | Mount Maidanak, Uzbekistan | 1972 | |
RTT150 (ex-AZT-22)[56][57] | 1.50 m | 59″ | Single | Russia + Turkey | TÜBİTAK National Obs., Turkey | |
AZT-20[58] | 1.50 m | 59″ | Single | Assy-Turgen Observatory, Kazakhstan[59] | ||
AZT-12[60] | 1.50 m | 59″ | Single | Estonia | Tartu Observatory, Estonia | 1976 |
Hexapod-Telescope (HPT)[61] | 1.50 m | 59″ | Single | Germany | Cerro Armazones Observatory, Antofagasta Region, Chile | 2005 |
OSN 1.5m (Nasmyth) | 1.50 m | 59″ | Single | Spain | Sierra Nevada Observatory, Granada, Spain | |
Persona-1 (C.2441)[62] | 1.50 m | 59″ | Korsch | Russia | Earth Orbit (SSO, terrestrial viewing) | 2008 |
GREGOR solar/night telescope[63] | 1.50 m | 59″ | Single | Germany | Teide Observatory, Tenerife, Spain | 2012 |
IRSF 1.4m[64] | 1.40 m | Single | Sutherland, South Africa Astronomical Observatory | 2000 | ||
TCC[65] | 1.40 m | Single | 38°10'12"N 20°36'36"E | 2010 | ||
ESO Coudé Auxiliary Telescope (CAT)[66][67] | 1.40 m | Single | La Silla, Chile | 1981 | ||
SkyMapper | 1.35 m | 53.15″ | Single | Australia | Siding Spring Observatory, New South Wales, Australia | 2008 |
USNOFS 1.3m[68] | 1.30 m | 51″ | Single | USA | USNO Flagstaff Station, Arizona, USA | 1998 |
Skalnaté pleso Observatory[69] | 1.30 m | Single | Slovakia | Skalnaté pleso Observatory, Astronomical Institute of Slovak Academy of Sciences, Slovakia | 2014[70] | |
Skinakas Obs. 1.3m | 1.30 m | Single | Greece | Skinakas Observatory, Island of Crete, Greece | 1995 | |
McGraw-Hill Telescope[71][72] | 1.27 m | 50″ | Single | USA | MDM Observatory, Arizona, USA (1975–present) Dexter, Michigan, USA (1969–1975) |
1969 |
1.26m infrared telescope | 1.26 m | 49.5" | Single | China | Xinglong Station, China | 1991 |
Herschel 40-foot(1.26 m d.)[73] | 1.26 m | 49.5″ | Metal | Great Britain + Ireland | Observatory House; England | 1789–1815 |
AZT-11[74] | 1.25 m | 49″ | Single | Abastumani Observatory, Rep. of Georgia | 1976 | |
AZT-11[75] | 1.25 m | 49″ | Single | Crimean Astrophysical Obs., Russia/Ukraine | 1981 | |
MPIA 1.2[76] | 1.23 m | 48.4″ | Single | West Germany+Spain | Calar Alto Obs., Alemíra, Spain | 1975 |
T-122 | 1.22 m | 48″ | Schmidt | Turkey | ÇOMÜ Ulupınar Observatory, Çanakkale, Turkey | 2002 |
Babelsberg Zeiss[77] | 1.22 m | 48″ | Single | Germany | Babelsberg Observatory, Berlin, Germany | 1924–1947 |
Galileo 1.22 m[78] | 1.22 m | 48″ | Single | Italy | Asiago Observatory, Italy | 1942 |
Samuel Oschin telescope | 1.22 m | 48″ | Schmidt | USA | Palomar Observatory, California, USA | 1948 |
Great Melbourne Telescope[79] | 1.22 m | 48″ | Metal | Great Britain | Melbourne Observatory, Victoria, Australia | 1878–1889 |
William Lassell 48-inch[80] | 1.22 m | 48″ | Metal | Great Britain | Malta | 1861–1865 |
Barabarella (OMI 48 inch)[81][82] | 1.22 m | 48″ | Single | USA | Lowrey Observatory, Texas, USA | 2008 |
Oskar-Lühning Telescope[83] | 1.20 m | 47″ | Single | Germany | Hamburg Observatory, Germany | 1975 |
Leonhard Euler Telescope[84] | 1.20 m | 47″ | Single | Switzerland | La Silla Observatory, Coquimbo Region, Chile | 1998 |
Mercator Telescope | 1.20 m | 47″ | Single | Belgium+Switzerland | ORM, Canary Islands, Spain | 2001[85] |
Hamburg Robotic Telescope (HRT)[86] | 1.20 m | 47″ | Single | Germany | Hamburg-Bergdorf Obs., Germany | 2002 |
UK Schmidt Telescope | 1.20 m | 47″ | Schmidt | UK | Siding Spring Observatory, New South Wales, Australia | 1973 |
GeoEye-1[87] | 1.10 m | 43.3″ | Single | USA | Earth Orbit (terrestrial viewing) | 2008 |
Hänssgen's reflector[88] | 1.07 m | 42″ | Single | Germany | Mobile (~Germany) | 2002 |
KLENOT[89] | 1.06 m | 42″ | Single | Czech Republic | Kleť Observatory, Czech Republic | 2002 |
Nickel Telescope | 1.02 m | 40″ | Single | USA | Lick Observatory, California, USA | 1979 |
UTAS 40-inch | 1.02 m | 40" | R/C | Australia | Mount Canopus, Tasmania, Australia | 1973 |
George Ritchey 40-inch (1 m)[90] | 1.02 m | 40″ | R/C | USA | USNO Flagstaff Station, Arizona, USA (Washington, D.C. until 1955) | 1934 |
Yerkes "41-inch"[91] | 1.02 m | 40″ | Single | USA | Yerkes Observatory, Wisconsin, USA | 1968[92] |
ZIMLAT[93] | 1.00 m | 39.4″ | Single | Switzerland | Zimmerwald Obs., Switzerland | 1997 |
Meudon Observatory 1m[94] | 1.00 m | 39.4″ | Single | France | Meudon Observatory/ Paris Observatory | 1891 [95] |
Lulin One-meter Telescope (LOT)[96][97] | 1.00 m | 39.4" | Single | Taiwan | Lulin Observatory, Taiwan | 2002 |
Vihorlat national telescope[98][99] | 1.00 m | 39.4" | single | Slovakia | Astronomical observatory on Kolonický mountain pass, Slovakia | |
Wise one-meter telescope | 1.00 m | 39.4" | single | Israel | Wise Observatory, Israel | 1973 |
SAAO 1-meter Elizabeth Telescope | 1.00m | 39.4″ | Single | South 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 m | 39.4" | Single | China | Purple Mountain Observatory, China | 2006 |
RT 1.00 m | 1.00 m | 39.4″ | TÜBİTAK National Observatory | |||
OGS Telescope[101] | 1.00 m | 39.4″ | Single | European Space Agency countries | Teide Observatory, Canary Islands, Spain | 1995 |
Jacobus Kapteyn Telescope | 1.00 m | 39.4″ | Single | UK + Netherlands | Isaac Newton Group, Canary Islands, Spain | 1984 |
Zeiss di Merate (1m reflector) | 1.00 m | 39.4″ | Single | Kingdom of Italy | Merate Obs., Merate, Italy | 1926 |
T1M | 1.00 m | 39.4″ | Cassegrain | France | Lyon Observatory, Saint-Genis-Laval, France | 1970s |
Zeiss 1m reflector | 1.00 m | 39.4″ | Single | Belgium | Royal Obs., Uccle, Belgium | |
Hamburg Spiegelteleskop (1m reflector)[102][103] | 1.00 m | 39.4″ | Single | Deutsches Reich (Germany) | Hamburg-Bergdorf Obs., Germany | 1911 |
Kepler Mission telescope | 0.95 m | 37.4″ | Single | USA | Earth-trailing Orbit (Heliocentric) | 2009 |
James Gregory Telescope | 0.94 m | 37" | Single | Great Britain | University of St Andrews, Scotland, UK | 1962 |
Kuiper Airborne Obs.(KAO) | 0.914 m | 36″ | Single | USA | C-141 (mobile) | 1974–1995 |
Crossley Reflector[104] | 0.914 m | 36″ | Single | US+UK | Lick Observatory, California, USA | 1896 |
A.A. Common Reflector | 0.914 m | 36″ | Single | Great Britain | Great Britain | 1880–1896 |
Rosse 36-inch Telescope | 0.914 m | 36″ | Metal | Great Britain | Birr Castle; Ireland | 1826 |
SMARTS 0.9m Telescope | 0.914 m | 36″ | Single | USA, SMARTS | Cerro Tololo Inter-American Observatory, Coquimbo Region, Chile | 1965 |
Spacewatch 0.9m Telescope | 0.914 m | 36″ | Single | USA | Steward Observatory enclave at Kitt Peak National Observatory, Arizona, USA | Contracted 1915, Completed 1921 |
Yapp telescope | 0.914 m | 36″ | Single | U.K. | Royal Observatory, Greenwich +Herstmonceux |
1934-1990 |
Selected telescopes below about 1 meter/yard aperture
Name | Aperture m |
Aper. in |
Type | Nationality of Sponsors | Site | Built/Used |
---|---|---|---|---|---|---|
Hopkins Ultraviolet Telescope | 0.90 m | 35.4″ | Single UV | USA | Earth Orbit | 1990, 1995 |
Potsdam Great Refractor (double refractor) | 0.80 m | 31.5 ″ | Doublet | Germany | Potsdam, Germany | 1899 |
Optical Ground Station Oberpfaffenhofen [105] | 0.80 m | 31.5 ″ | R/C | Germany | Oberpfaffenhofen, Germany | 2022 |
Pine Mountain Observatory 32"[106] | 0.82 m | 32" | Single | USA | Pine Mountain Observatory, Pine Mountain, Oregon. 6300 feet elevation. | 1970 |
IAC80 | 0.82 m | 32" | Single | Spain | Teide Observatory, Canary Islands, Spain | 1993 |
JAST/T80[107] | 0.80 m | Single | Javalambre Observatory, Spain (Z32) | |||
Joan Oró telescope | 0.80 m | 32" | R/C | Spain | Montsec Astronomical Observatory, Catalonia. 5150 feet elevation. | 2008 |
UMBC Observatory | 0.80 m | 32" | R/C | United States | University of Maryland, Baltimore County, Baltimore, MD. 200 feet elevation | 1999 |
Astron[108] | 0.80 m | 31.5″ | Single UV | CCCP + France | Earth orbit | 1983–1989[108] |
Ruisinger[109] | 0.762 m | 30″ | Single-Newtonian | USA – ASKC | Powell Observatory; Louisburg, Kansas | 1985 |
Obsession Telescopes #102[110] | 0.762 m | 30″ | Single | USA | Omaha, Nebraska (mobile) | 1993 |
AKARI (ASTRO-F)[111] | 0.685 m | 27″ | Single IR | Japan + Misc. | Earth Orbit | 2006–2011 |
William Lassell 24-inch[112] | 0.61 m | 24″ | Metal | Great Britain | Liverpool, England | 1845 |
Infrared Space Observatory | 0.60 m | 23.5″ | Single IR (2.4 to 240) | European Space Agency | Earth orbit (GEO) | 1995–1998 |
TRAPPIST[113] | 0.60 m | 23.5″ | Single | Belgium | La Silla Observatory, Coquimbo Region, Chile | 2010[114] |
IRAS[115] | 0.57 m | 22.44″ | Single IR | USA + UK + The Netherlands | Earth orbit | 1983 |
Antarctica Schmidt telescopes (AST3-1)[116] | 0.50 m | 19.7″ | Single | China | Antarctic Kunlun Station | 2012 |
Mars Reconnaissance Orbiter—HiRISE | 0.50 m | 19.7″ | R/C | USA | Mars orbit | 2005 |
TacSat-2[117] | 0.50 m | 19.7″ | R/C | USA | Earth orbit (terrestrial viewing) | 2006–2011 |
Uppsala Southern Schmidt Telescope | 0.50 m | 19.7″ | Schmidt | Multiple | Sweden / Australia | 1956–2013 |
Ege University- A48 Reflecting Cassegrain telescope | 0.48 m | 18.9″ | Single | Turkey | Ege University Observatory, Izmir, Turkey | 1968 |
Herschel 20-foot (0.475 m d.)[118][119] | 0.475 m | 18.5″ | Metal | Great Britain | Observatory House; England | 1782 |
Dutch Open Telescope (DOT) | 0.45 m | 17.7″ | Solar | Denmark | ORM, Canary Islands | 1997 |
Explorer 57 (IUE) | 0.45 m | 17.7″ | UV | US+UK+ESA Countries | Earth orbit (GEO) | 1978–1996 |
University of Rochester Telescope Project[120] | 0.40 m | 16″ | R/C | USA | Rochester NY (mobile) | 2011 |
Armagh 15- inch Grubb Reflector[121] | 0.38 m | 15″ | Metal | Great Britain | Armagh Observatory, Northern Ireland | 1835[122] |
TacSat-3 | 0.35 m | 14″ | R/C | USA | Earth orbit (terrestrial viewing) | 2009–2012 |
Mars Global Surveyor—MOC[123] | 0.35 m | 13.8″ | R/C | USA | Mars Orbit | 1996–2006 |
JHS Meade | 0.31 m | 12″ | S/C | Germany | NEO (Near Earth Objects) | 2009 |
XMM-Newton—UV camera | 0.30 m | 11.9″ | Single UV | ESA Countries | Earth orbit | 1998 |
SWIFT UVOT | 0.30 m | 11.9″ | Single UV | US+ UK+Italy | Earth orbit | 2004 |
Hipparcos | 0.29 m | 11.4″ | Schmidt | European Space Agency | Earth orbit (GTO) | 1989–1993 |
CoRoT | 0.27 m | 10.6″ | afocal | France + ESA | Earth orbit | 2007 |
Centre for Basic Space Science Optical Telescopes[124] | 0.25 m | 9.84″ | Single | Nigeria | NASRDA-CBSS Observatory, Nsukka | 2006 |
Astronomical Netherlands Satellite | 0.22 m | 8.7″ | Single UV | The Netherlands & USA | Earth Orbit | 1974–1976 |
New Horizons—LORRI | 0.208 m | 8.2″ | R/C | USA | Space (33+ AU from Earth) | 2006 |
Lunar Reconnaissance Orbiter LROC-NAC[125] | 0.195 m | 7.68″ | Reflector | USA | Lunar orbit | 2009 |
Hadley's Reflector[126] | 0.15 m | 6″ | Metal | Great Britain | England (mobile) | 1721 |
Chinese Small Telescope Array (CSTAR) | 0.145 m | 6″ | Single | China | Antarctic Kunlun Station | 2008 |
University of Tokyo PRISM[127] | 0.10 m | 3.9″ | Single | Japan | Earth Orbit (terrestrial viewing) | 2009 |
Newton's reflector[128][129] | 0.033 m | 1.3″ | Metal | Great Britain | England (mobile) | 1669 |
MESSENGER MDIS-WAC[130] | 0.03 m | 1.18″ | Lens | USA | Space (Mercury orbit) | 2004 |
MESSENGER MDIS-NAC[131] | 0.025 m | 0.98″ | R/C | USA | Space (Mercury orbit) | 2004 |
Dawn Framing Camera (FC1/FC2)[132] | 0.02 m | 0.8″ | Lens | Germany + USA | Space (Asteroid belt) | 2007 |
See also
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