2.1 m (82") Otto Struve Telescope
Instruments
Prime f/3.9 focus
Cassegrain f/13.7 focus
Sandiford Cass Echelle Spectrometer (SES)
Imaging Grism Instrument (IGI)
Optical
|
Primary Mirror |
|
|
Diameter |
2.08 m (82") |
|
Focal length |
8.13 m (26.7') |
|
F-ratio |
3.90 |
|
Field angle |
63.5 arcmin |
|
Plate scale |
25.4 arcsec/min |
|
Cassegrain f/13.7 focus |
|
|
Focal length |
28.53 m (96.6') |
|
F-ratio |
13.65 |
|
Field angle |
20 arcmin |
|
Plate scale |
7.25 arcsec/mm |
|
Coudé focus - not presently in use |
|
|
Focal length |
47.70 m (156.5') |
|
F-ratio |
22.9 |
|
Plate scale |
4.3 arcsec/mm |
Mechanical
|
Primary Mirror |
|
|
Weight |
1900 kg (4200 lbs) |
|
Thickness |
29.8 cm (11.75") |
|
Material |
pyrex |
|
Telescope Tube |
|
|
Diameter |
2.64 m (8'8") |
|
Length |
8.2 m (27') |
|
Telescope |
|
|
Weight |
41 t (45 tons) |
|
Bearings |
|
|
Polar axis |
ball radial thrust bearings |
|
Dec axis |
taped roller bearings |
|
Dome |
|
|
Diameter |
19 m (62') |
|
Weight |
104 t (115 tons) |
Historical
|
Construction |
|
|
Started |
1933 |
|
Completed |
1939 |
|
Contractor |
|
|
Design |
Otto Struve |
|
Telescope |
Warner and Swasey Co. |
|
Dome |
Patterson Leitch Co. |
|
Optics |
C. Lundin |
2.1 m (82") Otto Struve Telescope
Prime f/3.9 focus
Cassegrain f/13.7 focus
Sandiford Cass Echelle Spectrometer (SES)