October 3, 2011.
Kedr satellite operation in orbit

Mini-satellite Kedr – a joint project between S.P. Korolev Rocket and Space Corporation Energia, NASA and students of the Kursk State Technical University - has been successfully working in orbit for two months.

The satellite is intended for performing the RadioSkaf space experiment.

During its free flight in orbit, the satellite has made about 870 orbits around the Earth, transmitted about 65 thousand images, as well as voice greeting messages and telemetry data on the status of systems and scientific equipment.

All the satellite equipment functions normally. Since August 13, Kedr has been transmitting data only during sunlit portions of the orbit because the buffer battery switched off having used up its service life of 30 charge/discharge cycles. The power is now provided by the solar arrays.


For reference:

  1. The RadioSkaf space experiment is conducted under a student's program for space education of the young people of Russia and other countries.
  2. Kedr satellite was launched on August 3, 2011 by cosmonaut Sergei Volkov from onboard the International Space Station in the course of a space walk.
  3. Kedr was developed under UNESCO educational program.
  4. While in free flight, Kedr transmits 25 voice greeting messages in 17 languages 20 seconds long with 2 minutes pauses, telemetry data from scientific and systems equipment, as well as images in SSTV format from 4 digital video cameras. The satellite onboard systems are controlled via command radio link at the frequency of 430 MHz from the RSC Energia ground tracking station. The satellite onboard systems are powered from 6 solar array panels. The satellite has ham radio call sign RS1S.
  5. Satellite equipment:
    • scientific equipment from Kursk State Technical University (vacuum meter);
    • Solar array panels (6 pieces) in three planes;
    • antenna and feeder device - 2 strip antennas for 145 MHz/2 m and 430 MHz/70 cm;
    • video cameras (4 pcs.);
    • transmitting and receiving units of the communications system (2 pcs.);
    • Signal processing and forming unit;
    • Image forming unit;
    • storage battery with a unit for recharging from solar arrays;
    • control unit for equipment activation.
  6. Body dimensions are 600х600х300 mm. The satellite mass is 30 kg.
  7. The satellite sound identification signals and images of Earth received by ground tracking stations in different countries are published on the web site
  8. You can learn more details about Kedr satellite at: - current position of the satellite, - images received from the satellite in September and in August, - current telemetry from the satellite, information about RadioSkaf project.


Cosmonaut S.Volkov with Kedr satellite inside ISS Cosmonauts A. Samokutyaev and S. Volkov preparing Kedr satellite for launch from the ISS surface Kedr on a tether prior to its separation from ISS



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