Photo by Tom Polakis

Site Elevation: 3178 m (10,450 ft) Latitude: 32d 42m 05s North Longitude: 109d 53m 26s West Travel time from Tucson: approximately 3.5 hours.

Wavelength Range 0.3 - 1.0 mm in typical conditions 1.0 - 2.0 mm in inclement weather

Geometry Main reflector: paraboloid D=10 m F/D=0.35. Subreflector: hyperboloid d=0.69 m Fe/D=13.8. Focus: Nasmyth or bent Cassegrain foci (2-outside each elevation bearing).

Reflector Spaceframe support: carbon fiber reinforced plastic (CFRP) tubes with invar steel joints (3040 kg weight). Panels: CFRP skin with aluminum honeycomb sandwich core (110 Kg weight). Subreflector support: CFRP tube quadrupod (110 kg weight).

Secondary Single mirror - CFRP aluminum honeycomb sandwich. Chopping mechanism - at 80% duty cycle: 10 Hz with 4 arcminute throw. 25 Hz with 25 arcsecond throw. 16 mirror positions possible for raster scanning.

Mount: Altitude/Azimuth - steel with thermal insulation. Absolute pointing accuracy: 1 arcsecond rms. Tracking precision: 0.2 arcsecond rms. Azimuth range: +/-270 degrees. Elevation range: -2 degrees to 91 degrees. Slew speed: 60 degrees/min. 41500 kg weight.