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SRET 1 (a French acronym for 'Satellite for Research on Environment and Technology') was a French-built satellite launched in tandem with the Russian COMSAT Molniya 1V to test thin film cadmium sulfide and cadmium telluride solar cells as well as a new lightweight battery. The satellite, also called MAS (a Russian acronym for 'Small Automatic Satellite'), was in the form of an eight-sided polyhedron with a diameter of 55.9 cm and a weight of about 15.9 kg. Four of the eight sides were faced with conventional silicon cells and provided power for the experiment. Two of the remaining sides had cadmium sulfide cells and the other two had cadmium telluride cells. The satellite orbited in the approximate path of Molniya 2A, ranging between 46,250 and 545 km. Its elliptical orbit took it through the Van Allen radiation belt four times each day, thus providing additional data on the effect of radiation on the experimental solar cells and semiconductor materials. SRET 1 was the first French satellite launched by the Soviets, with two more planned in the 1972-74 time period.

Alternate Names

  • 05928
  • MAS
  • SRET1

Facts in Brief

Launch Date: 1972-04-04
Launch Vehicle: Modified SS-6 (Sapwood) with 2nd Generation Upper Stage + Escape Stage
Launch Site: Tyuratam (Baikonur Cosmodrome), U.S.S.R
Mass: 15.9 kg

Funding Agency

  • Unknown (France)


  • Engineering

Additional Information

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

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