Computer Science – Performance
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983esasp.200..171u&link_type=abstract
In ESA Environ. and Thermal Control Systems for Space Vehicles p 171-177 (SEE N84-19396 10-18)
Computer Science
Performance
Cryogenic Cooling, Cryogenic Equipment, Infrared Astronomy Satellite, Infrared Telescopes, Performance Prediction, Spaceborne Astronomy, Infrared Astronomy, Liquid Helium, Mathematical Models, Satellite Design, Superfluidity, Systems Simulation
Scientific paper
The IRAS telescope design and flight performance are described. The telescope is an f/9.6, 57 cm aperture Ritchey-Chretien, surrounded by a 545l tank containing superfluid helium maintained at 1.7 K by venting to space through a fixed flow impedance. The primary and secondary mirrors and the structure are of beryllium, to minimize thermal deformations and reduce cooldown times while providing satisfactory IR performance. The cryogenic structure is enclosed by a vacuum shell. A sunshade minimizes heat input. In orbit, the telescope optics are maintained at 4.5 K, detectors at 2.7 K, and the cryogen loss rate indicates a lifetime 11.5 months. The IRAS detected a 100 AV diameter cloud of cold matter around Vega, a 20 million miles long dust trail following Temple 2 comet, and discovered 4 comets.
Hopkins Richard A.
Mason Peter V.
Urbach A. R.
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