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P80-2
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Gross mass: 2,430 kg (5,350 lb).

• Spacecraft for the Satellite Infrared Experiment (SIRE). - . Spacecraft Bus: P. Spacecraft: P80-2.

  Lockheed Missiles and Space Company was awarded a $34 million contract to build a spacecraft for the Satellite Infrared Experiment (SIRE), designed to measure long wave infrared signatures. The spacecraft would also carry two secondary payloads - a space sextant and a sensor that would measure the isotopic composition of solar flares.

• Satellite Infrared Experiment terminated - . Spacecraft Bus: P. Spacecraft: P80-2.

  SAMSO terminated the SIRE (Satellite Infrared Experiment) contract with Lockheed because of large cost overruns. The SIRE payload was to have been launched on flight P80-2 and was to have measured the long wave infrared signatures of space objects against the stellar background. SAMSO began to develop a program to fly the SIRE sensor on space shuttle sortie missions around the mid-1980s.