High Energy Astronomy Observatory 3 | Wikipedia audio article
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Date: 19/11/2018

This is an audio version of the Wikipedia Article:
High Energy Astronomy Observatory 3

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SUMMARY
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The last of NASA's three High Energy Astronomy Observatories, HEAO 3 was launched 20 September 1979 on an Atlas-Centaur launch vehicle, into a nearly circular, 43.6 degree inclination low-Earth orbit with an initial perigeum of 486.4 km.
The normal operating mode was a continuous celestial scan, spinning approximately once every 20 min about the spacecraft z-axis, which was nominally pointed at the Sun.
Total mass of the observatory at launch was 2,660.0 kilograms (5,864.3 lb).HEAO 3 included three scientific instruments: the first a cryogenic high-resolution germanium gamma-ray spectrometer, and two devoted to cosmic-ray observations.
The scientific objectives of the mission's three experiments were:

(1) to study intensity, spectrum, and time behavior of X-ray and gamma-ray sources between 0.06 and 10 MeV; measure isotropy of the diffuse X-ray and gamma-ray background; and perform an exploratory search for X-and gamma-ray line emissions;(2) to determine the isotopic composition of the most abundant components of the cosmic-ray flux with atomic mass between 7 and 56, and the flux of each element with atomic number (Z) between Z = 4 and Z = 50;(3) to search for super-heavy nuclei up to Z = 120 and measure the composition of the nuclei with Z 20.