| Telescope |
Observatory |
Aperture |
Activated |
Location |
Elevation |
| inches |
centimeters |
feet |
meters |
W.M. Keck Telescope
(KECK I) |
W.M. Keck Observatory |
394 |
1,000 |
1993 |
Mauna Kea, Hawaii |
13,600 |
4,194 |
| Bolshoi Teleskop Azimutalnyi |
Special Astrophysical Observatory |
236 |
600 |
1976 |
Mt. Pastukhov, Russia |
6,791 |
2,070 |
| George Ellery Hale Telescope |
Palomar Observatory |
200 |
508 |
1948 |
Palomar Mt., California |
5,597 |
1,706 |
| MMT |
The MMT Observatory |
256 |
650 |
1979 |
Mt. Hopkins, Arizona |
8,530 |
2,600 |
| Nicholas U. Mayall Reflector |
Kitt Peak National Observatory |
158 |
400 |
1973 |
Kitt Peak, Arizona |
6,772 |
2,064 |
| Blanco Telescope |
Cerro Tololo Inter-American Observatory |
158 |
400 |
1976 |
Cerro Tololo, Chile |
7,871 |
2,399 |
| Anglo-Australian Telescope |
Anglo-Australian Observatory |
153 |
389 |
1975 |
Siding Spring Mt., Australia |
3,819 |
1,164 |
| U.K. Infrared Telescope |
The Joint Astronomy Centre |
150 |
380 |
1979 |
Mauna Kea, Hawaii |
13,759 |
4,194 |
| Canada-France-Hawaii Telescope |
|
142 |
360 |
1979 |
Mauna Kea, Hawaii |
13,780 |
4,200 |
| E.S.O. 3.6-Meter Telescope |
European Southern Observatory |
141 |
357 |
1976 |
Cerro La Silla, Chile |
7,874 |
2,400 |
| Otto Struve Memorial Reflector |
The McDonald Observatory |
82 |
208 |
1939 |
Mt Locke, Fort Davis, Texas |
6,809 |
2,075 |
| The Hobby-Eberly Telescope |
The McDonald Observatory |
433 |
1,100 |
1997 |
Mt Fowlkes, Fort Davis, Texas |
6,800 |
2,072 |
|
|
|
