ARGOS (Advanced Research and Global Observation Satellite)
The most advanced research and development satellite ever launched by the United States Air Force. It carries an ion propulsion experiment, ionospheric instruments, a space dust experiment, a high-temperature semiconductor experiment, and the Naval Research Laboratory’s hard X-ray astronomy detectors for X-ray binary star timing observations. Much delayed, it was finally placed into orbit on the 11th launch attempt along with the secondary payloads Ørsted and Sunsat.