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Instruments
Cassegrain focus: f/13.7
ProEM (active)
SQUEAN (active)
Exoplanet Transmission Spectroscopy Imager (ETSI)
ETSI is a PI Class Instrument owned and operated by Texas A&M University
Relevant ETSI papers can be found here and here
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.• Automation to target.
• Autoguiding.
• Sidereal tracking and ephemeris tracking using JPL Horizons data. HA track rate 1 to 18 arcsec/sec west, declination +-150 arcsec/sec.
• Dome automation during tracking.
• Computer control of dome slit, mirror cover, and baffle tube. Wide-field surveillance cameras on dome and tube.
