Satellite Laser Ranging facility. Tracking telescope for obtaining laser distance measurements day and night to orbiting satellites that carry the necessary retro-reflectors. Single-shot range precision about 3mm at distances of from 300km to 40,000km. The system can also measure brightness of satellites at night and record astrometric positions for low-orbiting satellites. A further telescope is used for nighttime astrometric observations of satellites in geosynchronous orbits.
