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The principal experiment is the T-SAGE instrument (Twin-Space Accelerometer for Gravity Experiment), built by ONERA, that is composed of two differential accelerometers and their two associated, concentric cylindrical masses. One accelerometer has masses made of different materials; one is titanium, the other a platinum-rhodium alloy. The masses are maintained within their test area by electrostatic repulsion, intended to maintain them motionless with respect to the satellite inside the independent differential electrostatic accelerometers. The other accelerometer has two weights made of the same material, platinum.

It was necessary to create a thermally benign environment for the accelerometers. They are mounted on the side of the satellite bus away from the sun; there is thermal isolation from the satellite; and, the modes of thermal connection were minimized and modeled to the extent of minimizing wire connections with the satellite.

Alternate Names

  • 41457

Facts in Brief

Launch Date: 2016-04-25
Launch Vehicle: Soyuz 2
Launch Site: Kourou, French Guiana
Mass: 303 kg

Funding Agency

  • Centre National d'Etudes Spatiales (France)


  • Other

Additional Information

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

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