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The two primary goals of this satellite were to minimize the effects of non-gravitational forces and to obtain the highest possible accuracy for laser range measurements. The satellite was spherically shaped with a 12-cm radius. The core was an alloy of uranium 238 and 1.5% molybdenum. The skin consisted of 20 spherical caps made of an alloy of aluminum and 5% magnesium with triangular bases. Each cap contained three laser corner cubes. The corner cubes were fused silica trihedrons with circular apertures made of suprasil 1 with silver coatings covered by inconel. For Groupe de Recherches de Geodesie Spatiale (GRGS), the principal objective was to study earth and ocean tides by (1) the determination of the second harmonics (amplitude and phase) of the main semidiurnal oceanic tides (M and S) and, if possible, of the diurnal K, O, and P tides; and (2) the determination of the dissipation in the solid earth and in the oceans (Q).

Alternate Names

  • 07646

Facts in Brief

Launch Date: 1975-02-06
Launch Vehicle: Diamant
Launch Site: Kourou, French Guiana
Mass: 47.3 kg

Funding Agency

  • Centre National d'Etudes Spatiales (France)


  • Earth Science

Additional Information

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

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