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Diademe 1



The Diademe 1 spacecraft was designed for experimental geodetic studies using Doppler effect and laser telemetry techniques. It was also used for installation of a navigational system by satellite. Originally three French stations, confined to the area around the Mediterranean Sea, tracked the spacecraft, so only semi-dynamic geodetic studies could be made. In addition to the laser reflectors and the oscillator for Doppler, the spacecraft carried one beacon, which operated on a 136-MHz frequency, for transmission of telemetry data. The spacecraft was stabilized according to the magnetic field, with the satellite axis tangent to the lines of force. A worldwide geodetic program was added through the cooperation of SAO (Smithsonian Astrophysical Observatory). Photographic observations by Baker-Nunn cameras determined an accurate orbit that permitted location of stations by the earth's center of mass with respect to the Europe 50 system. Two U.S. stations also tracked the spacecraft by laser. The spacecraft failed on January 2, 1970, but continued to be tracked by laser until June 1971.

Alternate Names

  • 02674
  • D 1C
  • Diademe1

Facts in Brief

Launch Date: 1967-02-08
Launch Vehicle: Diamant
Launch Site: Hammaguir, Algeria
Mass: 23 kg

Funding Agency

  • Unknown (France)


  • Earth Science

Additional Information

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



NameRoleOriginal AffiliationE-mail
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