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Observatories > The largest reflectors

The largest reflectors



 

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Diameter of
primary mirror 
(meters)
Name
and date of first light
Location Altitude
39 Extremely Large Telescope (ELT) (2025) Cerro Armazones, Chile 3046 m
30 Thirty Meter Telescope (1998) Mauna Kea, Hawaii, USA 4050 m
25.5 Giant Magellan Telescope (2022) Las Campanas, Chile 2516 m
11 South African Large Tel. (SALT) (2011) Karoo, South Africa 1798 m
10.4 Gran Telescopio Canaries (2009) Roque de los muchachos, Canarian Islands, Spain 2396 m
10.0 Keck1 (1993) 
Keck2 (1996)
Mauna Kea, Hawaii 4150 m
8.4 Large Sinoptic Survey Tel. (LSST) (2020) Cerro Pachon, Chile 2715 m
Large Binocular Telescope (LBI) (2002) Steward Observatory, Mount Graham, Az, USA 3221 m
8.3 Subaru (1999) Mauna Kea, Hawaii 4100 m
8.2 Antu (1998) VLT 
Cerro Paranal
, Chile
2635 m
Kueyen (1999)
Melipal (2000)
Yepun (2001)
8.1 Gemini North (1999) Mauna Kea, Hawaii 4100 m
Gemini South (2001) Cerro Pachon, Chile 2737 m
6.5 Monolithic Mirror Tel. (1998) Mt. Hopkins, Arizona, USA 2616 m
Magellan (1999) Las Campanas Obs. 
La Serena, Chile
2282 m
6.0 Bolshoi Teleskop Azimutalnyi 
(1976)
Zelentchuk, Caucasus, Russia 2070m
5.0 Hale (1948) Palomar Mountain, California, USA 1900 m
4.2 William Herschel (1987) Observatorio del Roque de los Muchachos 
La Palma, Canarian Islands, Spain
2400 m
4.0 Victor Blanco (1974) Cerro Tololo, Chile 2200 m
3.9 Anglo-Australian (1971) Siding Spring Obs. 
Coonabarabran, NSW, Australia
1145 m
3.8 Mayall (1973) Kitt Peak, Arizona, USA 2100 m
UKIRT, infrarouge (1985) Mauna Kea, Hawaii 4200 m
3.7 AEOS, military, tracking satellites Maui, Hawaii 3058 m
3.6 "3m60" (1977) European Southern Observatory (ESO) 
Cerro La Silla, Chile
2400 m
Canada-France-Hawaii (1979) Mauna Kea, Hawaii, USA 4200 m
Telescopio Nazionale Galileo (1997) La Palma, Canarian Islands, Spain 2370 m
3.5 MPI-CAHA (1984) Calar Alto, Spain 2200 m
New Technology NTT (1989) European Southern Obs. 
Cerro La Silla, Chile
2400 m
ARC (1994) Apache Point, New Mexico, USA 2788 m
WIYN (1994) Kitt Peak, Arizona, USA 2100 m
Starfire, US Air Force (1994) Kirtland AFB, New Mexico, USA 1900 m
3.0 Shane (1959) Lick Observatory 
Mount Hamilton, California, USA
1300 m
NASA IRTF Mauna Kea, Hawaii 4160 m
NODO, liquid mirror, 
observation of orbital debris
New Mexico, USA 2758 m
2.7 Harlan Smith (1969) Mt. Locke, Texas, USA 2100 m
2.6 BAO Byurakan Astrophysical Observatory 
Byurakan, Armenia
1405 m
Shajn (1961) Crimean Astrophysical Observatory 
Crimea
600 m
2.5 Hooker (1917) Mt. Wilson, California, USA 1700 m
Isaac Newton (1984) Observatorio del Roque de los Muchachos 
La Palma, Canarian Islands, Spain
2382 m
Nordic Optical (1988)
du Pont Las Campanas Observatory 
La Serena, Chile
2282 m
Sloan Digital Sky Survey Apache Point, New Mexico, USA 2788 m
2.45 CHARA (2000) Mt. Wilson, California, USA 1700 m
2.4 Hiltner Kitt Peak, Arizona, USA 2100 m
Hubble Space Telescope (1990) HST in orbit, 
remote from Baltimore, USA
600 000 m
2.3 WIRO, infrarouge Jelm Mtn., Wyoming, USA 2900 m
ANU Siding Spring Obs. 
Coonabarabran, NSW, Australia
1165 m
Bok (1969) Steward Obs 
Kitt Peak, Arizona, USA
2100 m
Vainu Bappu (1986) Indian Institute of Astrophysics 
Kavalur, India
700 m
2.2 ESO-MPI (1984) Cerro La Silla, Chile 2335 m
MPI-CAHA (1979) Calar Alto, Spain 2200 m
UH Mauna Kea, Hawaii 4200 m
2.0 Bernard Lyot (1980) Pic du Midi, France 2850 m
2.0 2m optical infrared telescope (2000) Hanle, Himalaya, India 4500 m
1.93 CNRS (1958) Saint Michel de Haute Provence, France 650 m
1.8 Pan-STARRS1 (2010) Pan-STARRS 
Haleakala, Maui, Hawaii, USA
4100 m
Pan-STARRS2 (2020)


Comparison of size of the largest telescopes (c) ESO