Explorer 18 (IMP 1, Interplanetary Monitoring Platform) was a solar-cell and chemical-battery powered spacecraft instrumented for interplanetary and distant magnetospheric studies of energetic particles, cosmic rays, magnetic fields, and plasmas.
Elliptical OrbitThe Program 206 satellite, carrying the KH-7 (Keyhole 7) camera system (codenamed Gambit-1), was the first successful high resolution space reconnaissance program. It was managed by NRO's Program A, the USAF-led segment of the National Reconnaissance Program managed from Los Angeles AFB in El Segundo, California.
Sun-Synchronous Orbit