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The US Military's STACKSAT mission involved the launch of three similar spacecraft (POGS, TEX, and SCE) on the same booster. Manufactured by Defense Systems Inc (DSI), the spacecraft were gravity gradient stabilized with body mounted solar arrays providing ~15 W orbit average power. POGS carried a magnetometer to accurately map the Earth's magnetic field for the Defense Mapping Agency. TEX and SCE each carried specially designed transmitters to study ionospheric effects on radio signals.

This spacecraft, TEX (Transceiver EXperiment), carried a variable power transmitter used to study ionospheric effects on RF transmissions. Data from the experiment were used to determine minimum spacecraft transmitter power levels for transmission to ground receivers.

Alternate Names

  • 20561
  • P87-2
  • USA 57

Facts in Brief

Launch Date: 1990-04-11
Launch Vehicle: Atlas E
Launch Site: Vandenberg AFB, United States
Nominal Power: 15 W

Funding Agency

  • Department of Defense-Department of the Air Force (United States)


  • Surveillance and Other Military
  • Space Physics
  • Engineering

Additional Information

Questions and comments about this spacecraft can be directed to: Coordinated Request and User Support Office

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