Kedr

{{Short description|Russian amateur radio minisatellite}}

{{About|the Kedr satellite|the Kedr sub-machine gun|PP-91 KEDR}}

{{Infobox spaceflight

| name = Kedr

| image = ARIS AMSAT.jpg

| image_caption = ARISSat-1 at Dayton Hamvention 2010

| mission_type = Amateur radio

| operator = RKK Energia

| website =

| COSPAR_ID = 1998-067CK

| SATCAT = 37772

| mission_duration = 6 months

| spacecraft_bus =

| manufacturer = The Radio Amateur Satellite Corporation (AMSAT-NA)

| dry_mass =

| launch_mass = {{convert|30|kg}}

| power =

| launch_date = {{start-date|28 January 2011, 01:31:39|timezone=yes}} UTC

| launch_rocket = Soyuz-U

| launch_site = Baikonur 1/5

| launch_contractor =

| deployment_from = ISS

| deployment_date = 3 August 2011

| last_contact =

| decay_date = 4 January 2012

| orbit_epoch =

| orbit_reference = Geocentric

| orbit_regime = Low Earth

| orbit_periapsis =

| orbit_apoapsis =

| orbit_inclination =

| orbit_period =

| apsis = gee

}}

Kedr ({{langx|ru|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{{cite web|title=ArisSat-1 SK|url=http://www.southgatearc.org/news/january2012/arissat1_sk.htm|access-date=4 January 2012|archive-url=https://web.archive.org/web/20120306151750/http://www.southgatearc.org/news/january2012/arissat1_sk.htm|archive-date=6 March 2012|url-status=dead}} 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, voice, telemetry and slow-scan television data on a frequency of 145.950 MHz.{{citation|language=ru|publisher=Kursk State University "Sporadic" radio club|url=http://sporadic.ru/|title=Запуск RS1S (Кедр) ARISSat-1 (Starting RS1S (Kedr) ARISSAT-1)|date=April 2, 2011}} The satellite was also intended for use in educational programmes.{{citation|title=SPACEWARN Bulletin 687|url=http://nssdc.gsfc.nasa.gov/spacewarn/spx687.html|publisher=NASA|date=February 1, 2011}} Kedr was a {{convert|30|kg|adj=on}} satellite measuring {{convert|55|cm}} by {{convert|55|cm}} by {{convert|40|cm}}. It carried solar cells to generate power, and was expected to operate for six months.{{cite web|last=Krebs|first=Gunter|title=ARISSat 1 (Radioskaf 2, Kedr)|url=http://space.skyrocket.de/doc_sdat/arissat-1.htm|work=Gunter's Space Page|access-date=10 February 2011}}

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.{{cite web|title=ISS On-Orbit Status|url=http://www.nasa.gov/directorates/somd/reports/iss_reports/2011/01282011.html|publisher=NASA|access-date=10 February 2011|date=28 January 2011|archive-date=22 October 2020|archive-url=https://web.archive.org/web/20201022160856/https://www.nasa.gov/directorates/somd/reports/iss_reports/2011/01282011.html|url-status=dead}} It docked with the International Space Station at 02:39 UTC on 30 January.{{cite web|title=ISS On-Orbit Status|url=http://www.nasa.gov/directorates/somd/reports/iss_reports/2011/01302011.html|publisher=NASA|access-date=10 February 2011|date=30 January 2011|archive-date=22 October 2020|archive-url=https://web.archive.org/web/20201022153912/https://www.nasa.gov/directorates/somd/reports/iss_reports/2011/01302011.html|url-status=dead}}

Kedr was deployed from the ISS by Sergey Volkov during an extra-vehicular activity on 3 August 2011{{citation|title=ARISSat-1 Finally Deployed from ISS|date=August 3, 2011|publisher=ARRL|url=http://www.arrl.org/news/view/arissat-1-finally-deployed-from-iss|access-date=2011-08-05}} and re-entered Earth's atmosphere on 4 January 2012, 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.