Strategy for the IRAS all-sky survey

Details Strategy for the IRAS all-sky survey Strategy for the IRAS all-sky survey

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aiaa.meetq....l&link_type=abstract

American Institute of Aeronautics and Astronautics, Aerospace Sciences Meeting, 22nd, Reno, NV, Jan. 9-12, 1984. 29 p. NASA-supp

Astronomy and Astrophysics

Astronomy

Infrared Astronomy Satellite, Infrared Telescopes, Mission Planning, Sky Surveys (Astronomy), Spaceborne Telescopes, Computerized Simulation, Postlaunch Reports, Prelaunch Summaries, Satellite Orbits, Tradeoffs

Scientific paper

IRAS (the Infrared Astronomical Satellite) was launched on January 25, 1983 (January 26 GMT) with the primary purpose of performing an infrared survey of the entire celestial sphere. To ensure completeness and reliability, every point of sky was to be covered by a minimum of four separate scans of the telescope field-of-view, and as much as possible with six, with certain added timing constraints on the elapsed interval between scans. These strong requirements for sky coverage, combined with a restricted, rotating viewing-window, made extensive planning for the survey strategy, both pre-launch and during operations, a necessity. The result was that on November 21 (November 22 GMT), when the liquid helium required for cooling was depleted, 96 percent of the sky was covered to the minimum depth of four and 71 percent was coverd to depth six or more.

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