Kedr (Russian: кедр meaning Siberian pine; Yuri Gagarin's callsign during the Vostok 1 mission) also known as ARISSat 1 and RadioSkaf-2, was 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 was deployed from the ISS by a cosmonaut during an extra-vehicular activity on 3 August 2011. and re-entered Earth's atmosphere on 4 January 2012, having spent 154 days in orbit.