Computer Science – Performance
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986spie..627..243l&link_type=abstract
IN: Instrumentation in astronomy VI; Proceedings of the Meeting, Tucson, AZ, Mar. 4-8, 1986. Part 1 (A87-36376 15-35). Bellingha
Computer Science
Performance
Ccd Star Tracker, Rosat Mission, X Ray Telescopes, Accuracy, Attitude Control, Cameras, Performance Tests, Space Shuttle Payloads, Spatial Resolution
Scientific paper
A high precision star tracker has been developed as part of the attitude-measurement and control system of the German Roentgen-Satellite. A Peltier-cooled CCD array in the focal plane of an 82-mm refractive lens is used to measure the position of up to three stars within a field of view of 5.9 x 4.4 deg. The position of a fourth reference star provided by the telescope of the satellite as an alignment control can be monitored simultaneously. Optical performance tests on the engineering model have demonstrated the capability to track stars of m(v) = +6.5 with an accuracy of 2 arcsec, and a noise equivalent angle of less than 1 arcsec with an update period of 1 sec. In scan mode, the stars can be tracked with an accuracy of less than 10 arcsec at a scan rate of 5 arcmin/sec.
Lange Guenter
Mossbacher Bernhard
Purll David
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