Launch Success
Liftoff Time (GMT)
06:29:31
Friday August 12, 1977
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HEAO-1 was an X-ray telescope launched in 1977. HEAO-1 surveyed the sky in the X-ray portion of the electromagnetic spectrum (0.2 keV – 10 MeV), providing nearly constant monitoring of X-ray sources near the ecliptic poles and more detailed studies of a number of objects by observations lasting 3–6 hours. It was the first of NASA's three High Energy Astronomy Observatories.
Low Earth Orbit
1 Payload
2,552 kilograms
41st
Mission
2nd
Mission of 1977
78th
Orbital launch attempt