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Design and operation

The full ATLAS concept consists of eight 50-centimeter diameter f/2 Wright - Schmidt telescopes, spread over the globe for full-night-sky and 24h/24h coverage, and each fitted with a 110 Megapixel CCD array camera. The current system consists of four such telescopes: ATLAS1 and ATLAS2 operate 160 km apart on the Haleakala and Mauna Loa volcanoes in the Hawaiian Islands, ATLAS3 is at the South African Astronomical Observatory and ATLAS4 is in Chile. These telescopes are notable for their large 7.4° field of view — about 15 times the diameter of the full moon — of which their 10 500 × 10 500 CCD camera images the central 5.4° × 5.4°. This system can image the whole night sky visible from a single location with about 1000 separate telescope pointings. At 30 seconds per exposure plus 10 seconds for simultaneously reading out the camera and repointing the telescope, each ATLAS unit can therefore scan the whole visible sky a little over once each night, with a median completeness limit at apparent magnitude 19.