ARISSat-1 at Dayton Hamvention 2010
Mission typeAmateur radio
OperatorRKK Energia
COSPAR ID1998-067CK Edit this at Wikidata
SATCAT no.37772
Mission duration6 months
Spacecraft properties
ManufacturerThe Radio Amateur Satellite Corporation (AMSAT-NA)
Launch mass30 kilograms (66 lb)
Start of mission
Launch date28 January 2011, 01:31:39 (2011-01-28UTC01:31:39Z) UTC
Launch siteBaikonur 1/5
Deployed fromISS
Deployment date3 August 2011
End of mission
Decay date4 January 2012
Orbital parameters
Reference systemGeocentric
RegimeLow Earth

Kedr (Russian: кедр meaning Siberian pine; Yuri Gagarin's callsign during the Vostok 1 mission), also known as ARISSat 1 and RadioSkaf-2 (formerly known as SuitSat 2), was[1] an amateur radio minisatellite operated by RKK Energia as part of the Amateur Radio on the International Space Station and RadioSkaf programmes. A follow-up to the SuitSat spacecraft, Kedr was launched to commemorate the fiftieth anniversary of the Vostok 1 mission.

Kedr transmitted 25 greetings in 15 different languages. It also transmitted photos of the Earth, telemetry and scientific data,[2] voice, telemetry and slow-scan television data on a frequency of 145.950 MHz.[3] The satellite was also intended for use in educational programmes.[2] Kedr was a 30-kilogram (66 lb) satellite measuring 55 centimetres (22 in) by 55 centimetres (22 in) by 40 centimetres (16 in). It carried solar cells to generate power, and was expected to operate for six months.[4]

For launch, Kedr was stored aboard the Progress M-09M spacecraft, which was launched to resupply the International Space Station. Progress M-09M was launched atop a Soyuz-U carrier rocket flying from Site 1/5 at the Baikonur Cosmodrome at 01:31:39 UTC on 28 January 2011.[5] It docked with the International Space Station at 02:39 UTC on 30 January.[6]

Kedr was deployed from the ISS by Sergey Volkov during an extra-vehicular activity on 3 August 2011[7] and re-entered Earth's atmosphere on 4 January 2012,[1] having spent 154 days in orbit.

"KEDR" was also used as the suffix for several Russian amateur radio call signs (for example, RS0KEDR) that were active in 2014 around the 80th anniversary of Gagarin's birth.


  1. ^ a b "ArisSat-1 SK". Archived from the original on 6 March 2012. Retrieved 4 January 2012.
  2. ^ a b SPACEWARN Bulletin 687, NASA, February 1, 2011
  3. ^ Запуск RS1S (Кедр) ARISSat-1 (Starting RS1S (Kedr) ARISSAT-1) (in Russian), Kursk State University "Sporadic" radio club, April 2, 2011
  4. ^ Krebs, Gunter. "ARISSat 1 (Radioskaf 2, Kedr)". Gunter's Space Page. Retrieved 10 February 2011.
  5. ^ "ISS On-Orbit Status". NASA. 28 January 2011. Retrieved 10 February 2011.
  6. ^ "ISS On-Orbit Status". NASA. 30 January 2011. Retrieved 10 February 2011.
  7. ^ ARISSat-1 Finally Deployed from ISS, ARRL, August 3, 2011, retrieved 2011-08-05