Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984laus.iafcx....n&link_type=abstract
International Astronautical Federation, International Astronautical Congress, 35th, Lausanne, Switzerland, Oct. 7-13, 1984. 9 p.
Astronomy and Astrophysics
Astronomy
Astronomical Satellites, Charge Coupled Devices, Electronic Control, Microprocessors, Star Trackers, X Ray Astronomy, Environmental Tests, Satellite Attitude Control, Satellite Design, Spaceborne Astronomy
Scientific paper
It is planned to launch an X-ray astronomy satellite, called Astro-C, in 1987. The satellite weighs approximately 430 kg and will be injected into a circular orbit of 500 km altitude with 30 deg inclination. Main objectives of the Astro-C are related to the study of extragalactic X-ray sources. A bias-momentum stabilization, implemented with the aid of a momentum wheel, will be utilized. The spacecraft attitude is to be controlled by means of three magnetic torquers. The attitude determination system of the Astro-C consists of an inertial reference unit (IRU), a pair of star trackers (STT), and a two-dimensional sun aspect sensor (SAS). The STT uses a microprocessor for data processing and mode control. Attention is given to the design of the SST, its performance, and test results verifying SST accuracy.
Hamada A.
Hirokawa E.
Murata Keizo
Ninomiya Kazufumi
Yokota Takumi
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