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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, POGS (Polar Orbiting Geomagnetic Survey), was designed to measure the Earth's magnetic field vector as a function of position. Data from the experiment were used to improve Earth navigation systems, and were stored in an experimental solid state recorder.

Alternate Names

  • 20560
  • P87-2
  • SSR
  • USA 56

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 Navy (United States)


  • Surveillance and Other Military
  • Space Physics
  • Engineering
  • Earth Science

Additional Information

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

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