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The Hard X-ray experiment on the Astronomical Netherlands Satellite
Gursky, H.; Schnopper, H.; Parsignault, D.
AA(Smithsonian Astrophysical Observatory and Harvard College Observatory, Cambridge, Mass), AB(Smithsonian Astrophysical Observatory and Harvard College Observatory, Cambridge, Mass), AC(American Science and Engineering, Inc., Cambridge, Mass)
Astrophysical Journal, vol. 201, Nov. 1, 1975, pt. 2, p. L127-L131. (ApJL Homepage)
Publication Date:
Instrumentation and Photography
NASA/STI Keywords:
Astronomical Netherlands Satellite, Satellite-Borne Instruments, Spaceborne Astronomy, X Ray Astronomy, European Space Programs, Line Spectra, Satellite Design
Bibliographic Code:


The Hard X-ray Experiment flown on the Astronomical Netherlands Satellite is described. The instrument consists of two parts. One is a large-area detector of about 60 sq cm in total area, sensitive in the energy range between 1.5 and 30 keV. Two counters comprise this detector, each collimated 10 min by 3 deg and offset in the narrow direction by 4 min. The other part is a Bragg-crystal assembly consisting of two PET crystals and counters aligned to search for the silicon emission lines near 2 keV. Instrument characteristics and orbital operations are described.

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