The SRET (Satellite de Recherches et d'Etudes Techniques) satellite had a mass of only 15 kg, and was analogous to the TRS satellites built by the USAF. It carried solar cell arrays to study the effect of radiation degradation.  SRET 1 was carried into orbit as a secondary payload with a Molniya satellite from Plesetsk in Apr 1972. The Soviets referred to it as MAS (Maliy Avtonomiy Sputnik, Small automatic satellite).
|1972 Apr 4||2056||Launch by Molniya-M||PL|
|Molniya sep from Blok-L (TS+0:00)|
|SRET sep from Blok-L (TS+0:02)||704.7 458 x 39250 x 65.6|
|1974 Feb 26||reentered?|