High Energy Astronomy Observatory 3

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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.

Excerpt from the Wikipedia article “High Energy Astronomy Observatory 3”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: NASA/JPL/William Mahoney, Public domain, via Wikimedia Commons.