Beskrivning : This mission was the third in the OAO program and its second successful spacecraft to observe the celestial sphere from above the earth`s atmosphere. A UV telescope with a spectrometer measured high-resolution spectra of stars, galaxies, and planets with the main emphasis on the determination of interstellar absorption lines. Three X-ray telescopes and a collimated proportional counter provided measurements of celestial X-ray sources and interstellar absorption.
Kennedy Space Center post stamp and Copernicus OAO satellite.

USA 581 - image retouchée ?

Sida : future · Ref: USA  581 

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OAO 3 (COPERNICUS) (ORBITING ASTRONOMICAL OBSERVATORY) · ATLAS SLV3C