The High Energy Astronomy Observatory 1 (HEAO-1) was a NASA
spacecraft observing X-rays.
It was launched in 1977 and and functioned until 1979.
- LASS aka A1 - Large-Area Sky Survey
- CXE aka A2 - Cosmic X-ray Experiment
- MC aka A3 - Modulation Collimator
- Hard X-ray / Low Energy Gamma-Ray Experiment aka A4
Among its accomplishments were x-ray sky surveys, such as the
HEAO A-1 X-ray Source Catalog.
HEAO-2 was a follow-on project.
|1H||1H 0323+342||HEAO-1||HEAO A-1 X-ray Source Catalog|
|H||H 2356-309||HEAO-1||various surveys on various instruments|