Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981tecn....9....7f&link_type=abstract
Technical News, vol. 9, Sept. 1981, p. 7-11.
Astronomy and Astrophysics
Astronomy
All Sky Photography, Infrared Astronomy Satellite, Infrared Telescopes, Satellite-Borne Instruments, Spaceborne Telescopes, Beryllium, Cryogenic Cooling, Environmental Tests, Far Infrared Radiation, Infrared Spectra, Instrument Compensation, Mirrors, Reflecting Telescopes, Sky Surveys (Astronomy), Space Environment Simulation
Scientific paper
In 1982, the Infrared Astronomy Satellite (IRAS) will be launched into a 900-km sun-synchronous (twilight) orbit to perform an unbiased, all-sky survey of the far-infrared spectrum from 8 to 120 microns. Observations telemetered to ground stations will be compiled into an IR astronomy catalog. Attention is given the cryogenically cooled, 60-cm Ritchey-Chretien telescope carried by the satellite, whose primary and secondary mirrors are fabricated from beryllium by means of 'Cryo-Null Figuring'. This technique anticipates the mirror distortions that will result from cryogenic cooling of the telescope and introduces dimensional compensations for them during machining and polishing. Consideration is also given to the interferometric characterization of telescope performance and Cryo/Thermal/Vacuum simulated space environment testing.
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