See movie
Instruments
Prime focus: f/3.9
ProEM (pending)
Cassegrain focus: f/13.7
ProEM (active)
SQUEAN (active)
Sandiford Echelle Spectrometer (SES) (inactive)
Cassegrain Spectrometer (ES2) (inactive)
CCD WHT Camera - Cassegrain f/13.7 focus (inactive)
Optical
Primary mirror | |
Diameter | 2.08 m (82") |
Focal length | 8.13 m (26.7') |
F-ratio | 3.9 |
Field angle | 63.5 arcmin |
Plate scale | 25.4 arcsec/mm |
Cassegrain focus | |
Focal length | 28.53 m (96.6') |
F-ratio | 13.7 |
Field angle | 20 arcmin |
Plate scale | 7.23 arcsec/mm |
Coudé focus - decommissioned | |
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 | Borosilicate glass (Pyrex™) |
Telescope | |
Diameter | 2.64 m (8'8") |
Length | 8.2 m (27') |
Weight |
41 t (45 tons) |
Bearings | |
Polar axis | SKF ball radial thrust bearings |
Dec axis | Tapered 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 |
Control Systems
• Remote observing capability. • Safe automation to target. • Actual on-sky rms tracking noise of 0.1 arcsec relative to the commanded rate. • Autoguiding tuned to OST's step response function, and guider specialized for calculating the PSF on a slit. • Dome automation during tracking. • Ephemeral tracking using JPL Horizons data. Check out OST tracking Soviet spy satellite Molniya 1-52 in the movie link above! • Computer control of dome slit, mirror cover, and baffle tube. Wide-field surveillance cameras on dome and tube. |