Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jhatd..14...14m&link_type=abstract
APL Technical Digest, vol. 14, Oct.-Dec. 1975, p. 14-22. NASA-sponsored research.
Astronomy and Astrophysics
Astronomy
Digital Command Systems, Sas-3, Satellite Attitude Control, Spaceborne Astronomy, X Ray Astronomy, Crab Nebula, Galactic Clusters, Novae, Nutation Dampers, Satellite Design, Supernova Remnants, X Ray Sources
Scientific paper
The experiment section of the Small Astronomy Satellite-3 (SAS-3) launched in May 1975 is an X-ray observatory intended to determine the location of bright X-ray sources to an accuracy of 15 arc-seconds; to study a selected set of sources over a wide energy range, from 0.1 to 55 keV, while performing very specific measurements of the spectra and time variability of known X-ray sources; and to monitor the sky continuously for X-ray novae, flares, and unexpected phenomena. The improvements in SAS-3 spacecraft include a clock accurate to 1 part in 10 billion, rotatable solar panels, a programmable data format, and improved nutation damper, a delayed command system, improved magnetic trim and azimuth control systems. These improvements enable SAS-3 to perform three-axis stabilized observations of any point on the celestial sphere at any time of the year. The description of the experiment section and the SAS-3 operation is followed by a synopsis of scientific results obtained from the observations of X-ray sources, such as Vela X-1 (supposed to be an accreting neutron star), a transient source of hard X-ray (less than 36 min in duration) detected by SAS-3, the Crab Nebula pulsar, the Perseus cluster of galaxies, and the Vela supernova remnant.
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