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. |
