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The SOFIA Airborne Observatory will operate a 2.5 m aperture telescope with the goal of obtaining over 960 successful science hours per year at a nominal altitude of 12.5 km and covering a wavelength range from 0.3 mm to 1.6 mm. The observatory platform is comprised of a Boeing 747SP with numerous significant modifications. The ground and flight mission operations architectures and plans are tailored to keep the telescope emissivity low and achieve high observing efficiency.
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Patrick G. Waddell, Jackie A. Davidson, "SOFIA mission operations," Proc. SPIE 4486, Infrared Spaceborne Remote Sensing IX, (8 February 2002); https://doi.org/10.1117/12.455096