OAO 1 (Orbiting Astronomical Observatory 1) was a solar-cell-powered satellite instrumented to make precision astronomical observations and to measure the absorption and emission characteristics of the stars, planets, nebulae, and the interplanetary and interstellar media from visible to gamma-ray regions.

Mission type: Planetary Science · Orbit: Low Earth Orbit

Rocket: Atlas SLV-3 Agena D · Provider: United States Air Force