Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976aiaa.meetq....c&link_type=abstract
American Institute of Aeronautics and Astronautics, Aerospace Sciences Meeting, 14th, Washington, D.C., Jan. 26-28, 1976, 9 p.
Astronomy and Astrophysics
Astronomy
Explorer 53 Satellite, Image Dissector Tubes, Sas-3, Satellite Attitude Control, Star Trackers, X Ray Astronomy, Calibrating, Design Analysis, Error Analysis, Flight Tests, Guidance Sensors, Spaceborne Astronomy, X Ray Sources
Scientific paper
The X-ray Astronomy experiments on Explorer 53 (SAS-C) require an accurate determination of spacecraft attitude. Two strapped-down star trackers with enough sensitivity to continuously track randomly encountered stars are employed. The trackers use image dissector tubes as the imaging device. An 8 deg square field-of-view is searched with a raster pattern. When stars brighter than a commanded threshold are encountered, a small cross-scan tracking pattern is used to obtain accurate position information. Ten arc-second overall tracker accuracy is achieved by ground computer calibration of distortion and environmental errors. Successful orbital operation, tracking stars dimmer than 6th magnitude, has been achieved.
Cleavinger R. L.
Mayer W. F.
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