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European X-ray Observatory Satellite (Exosat)

European X-ray Observatory Satellite (Exosat)

An artist's conception of the Exosat image

An artist's impression of the Exosat spacecraft. (Credit: ESA)

Lifetime: May 1983 - April 1986

Operator (primary): European Space Agency

Primary Science

The primary scientific goals of the Exosat were to measure the position, structural features and spectral and temporal characteristics of cosmic X-ray sources in the 0.04 - 80 keV range.

Science Highlights

  • Discovery of quasi periodic oscillations (QPOs) in low mass X-ray binaries and X-ray pulsars
  • Comprehensive study of the variability of active galactic nuclei
  • Measurement of the iron line in glactic and extragalactic sources

Links to more information


A service of the High Energy Astrophysics Science Archive Research Center (HEASARC), Dr. Alan Smale (Director), within the Astrophysics Science Division (ASD) at NASA/GSFC

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