Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jbis...36..363h&link_type=abstract
British Interplanetary Society, Journal (Space Chronicle) (ISSN 0007-084X), vol. 36, Aug. 1983, p. 363-367.
Astronomy and Astrophysics
Astronomy
Exosat Satellite, Spaceborne Astronomy, X Ray Astronomy, Lunar Occultation, Scintillation Counters, Spaceborne Telescopes, X Ray Telescopes
Scientific paper
Exosat, the ESA satellite for the direct-pointing and lunar-occultation observation of X-ray sources beyond the solar system, is characterized. Exosat was launched into a highly eccentric orbit (apogee 200,000 km, perigee 500 km) almost perpendicular to that of the moon on May 26, 1983. The instrumentation includes two low-energy imaging telescopes (LEIT) with Wolter I X-ray optics (for the 0.04-2 keV energy range), a medium-energy experiment using Ar/CO2 and Xe/CO2 detectors (for 1.5-50 keV), a Xe/He gas scintillation spectrometer (GSPC) (covering 2-80 keV), and a reprogrammable onboard data-processing computer. Exosat is capable of observing an object (in the direct-pointing mode) for up to 80 hours and of locating sources to within at least 10 arcsec with the LEIT and about 2 arcsec with GSPC. The past development of extrasolar-X-ray-astronomy satellites and the goals of the Exosat mission are discussed.
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