Encyclopedia Astronautica

French technology satellite. 2 launches, 1972.04.04 (SRET 1) and 1975.06.05 (SRET 2). Test satellite.

Gross mass: 23 kg (50 lb).
First Launch: 1972.04.04.
Last Launch: 1975.06.05.
Number: 2 .

More... - Chronology...

Associated Countries
See also
  • Soyuz The Russian Soyuz spacecraft has been the longest-lived, most adaptable, and most successful manned spacecraft design. In production for fifty years, more than 240 have been built and flown on a wide range of missions. The design will remain in use with the international space station well into the 21st century, providing the only manned access to the station after the retirement of the shuttle in 2011. More...

Associated Launch Vehicles
  • Soyuz Russian orbital launch vehicle. The world's first ICBM became the most often used and most reliable launch vehicle in history. The original core+four strap-on booster missile had a small third stage added to produce the Vostok launch vehicle, with a payload of 5 metric tons. Addition of a larger third stage produced the Voskhod/Soyuz vehicle, with a payload over 6 metric tons. Using this with a fourth stage, the resulting Molniya booster placed communications satellites and early lunar and planetary probes in higher energy trajectories. By the year 2000 over 1,628 had been launched with an unmatched success rate of 97.5% for production models. Improved models providing commercial launch services for international customers entered service in the new millenium, and a new launch pad at Kourou was to be inaugurated in 2009. It appeared that the R-7 could easily still be in service 70 years after its first launch. More...
  • Molniya 8K78M Russian orbital launch vehicle. Improved Molniya, in variants with Blocks ML, 2BL, or SO-L third stages according to payload. More...

Associated Manufacturers and Agencies
  • CNES French agency overseeing development of spacecraft. Centre National d'Etudes Spatiales, Paris, France. More...

  • McDowell, Jonathan, Jonathan's Space Home Page (launch records), Harvard University, 1997-present. Web Address when accessed: here.
  • JPL Mission and Spacecraft Library, Jet Propulsion Laboratory, 1997. Web Address when accessed: here.
  • McDowell, Jonathan, Launch Log, October 1998. Web Address when accessed: here.

Associated Launch Sites
  • Plesetsk Plesetsk was the Soviet Union's northern cosmodrome, used for polar orbit launches of mainly military satellites, and was at one time the busiest launch centre in the world. The collapse of the Soviet Union put the main launch site of Baikonur in Kazakh territory. It now seems that once the Proton rocket is retired, Baikonur will be abandoned and Plesetsk will be Russia's primary launch centre. Upgrades to existing launch facilities will allow advanced versions of the Soyuz rocket and the new Angara launch vehicle to be launched from Plesetsk. Plesetsk's major drawback was the lower net payload in geosynchronous orbit from a northern latitude launch site. However Russia is planning to remove the disadvantage by looping geosynchronous satellites around the moon, using lunar gravity to make the necessary orbital plane change. More...

SRET Chronology

1972 April 4 - . 20:38 GMT - . Launch Site: Plesetsk. Launch Complex: Plesetsk LC43/4. LV Family: R-7. Launch Vehicle: Molniya 8K78M.
  • SRET 1 - . Payload: MAS/SRET 1. Mass: 15 kg (33 lb). Nation: France. Agency: CNES. Class: Technology. Type: Navigation technology satellite. Spacecraft: SRET. Decay Date: 1974-02-26 . USAF Sat Cat: 5928 . COSPAR: 1972-025B. Apogee: 39,250 km (24,380 mi). Perigee: 458 km (284 mi). Inclination: 65.6000 deg. Period: 704.70 min. Summary: Test satellite. Investigation of the upper atmosphere and outer space..

1975 June 5 - . 01:38 GMT - . Launch Site: Plesetsk. LV Family: R-7. Launch Vehicle: Molniya 8K78M.
  • SRET 2 - . Payload: SRET 2 (MAS 2). Mass: 30 kg (66 lb). Nation: France. Agency: CNES. Class: Technology. Type: Navigation technology satellite. Spacecraft: SRET. Decay Date: 1988-07-10 . USAF Sat Cat: 7910 . COSPAR: 1975-049B. Apogee: 40,825 km (25,367 mi). Perigee: 513 km (318 mi). Inclination: 62.8000 deg. Period: 737.80 min. SRET 2 technological research and study satellite. Launched from Soviet Union with a Soviet launch vehicle with the Molniya satellite. Mass 30 kg. Study of the behaviour of a passive cryogenic radiation system, study of the aging of thermal casings and pl astic films.

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