Model of Luch-5A at CeBIT in 2011
|Major contractors||JSC Information Satellite Systems|
|Mission type||geosynchronous relay satellite|
|Launch date||11 December 2011, 11:17UTC|
|Launch site||Baikonur Cosmodrome, 81/24|
|Mission duration||10 years|
|Mass||1,148 kilograms (2,530 lb)|
Luch 5A (Russian: Луч-5А meaning ray and sometimes transliterated as Loutch-5A) is a Russian Luch relay satellite which will transmit data from the Russian Orbital Segment of the International Space Station, and from other satellites in low Earth orbit. It will be in geosynchronous orbit.
Luch 5A is one of a planned three Luch relay satellites. Luch 5B was launched on 2 November 2012 and Luch 5V is expected in 2013 or 2014. They are dual purpose satellites with both military and civil uses, and are similar to those in the US Tracking and Data Relay Satellite System.
Luch 5A was built by JSC Information Satellite Systems using the Ekspress-1000A bus. It has 6 S and Ku band channels with repeaters manufactured by Thales Alenia Space and other equipment manufactured by Sumitomo. The Ku band antenna operates at up to 150 Mbit/s and the S band antenna at up to 5 Mbit/s. The satellite also relays COSPAS/SARSAT signals and Planet-S System data. 
The satellite is designed to relay data from the ISS, satellites in low earth orbit and rocket launch vehicles.
Luch 5A is located at 167° E.
Luch 5A was launched on 11 December 2011 with satellite Amos 5. It was launched from Baikonur Cosmodrome launchpad 81/24 by a Proton-M rocket with a Briz-M upper stage. It was launched at 11:17 UTC and after four burns of the Briz-M upper stage it was placed into geosynchronous transfer orbit.
- "Luch 5A". Gunter's Space Page. 2010. Retrieved 2012-11-06.
- "2011-074". zarya.info. 2012. Retrieved 2012-11-06.
- "Russia launches two telecoms satellites". RIA Novosti. 2012-11-06. Retrieved 2011-12-11.
- "Loutch-5A and Loutch-5B DRSs". ISS Reshetnev. 2012-11-03. Retrieved 2012-11-04.
- "AMOS-5 and Loutch-5A successfully launched". ISS Reshetnev. 2012-11-06. Retrieved 2012-11-04.
- "Thales Alenia Space to supply repeaters equipment for Russian satellites Loutch-5A and Loutch-5B". Thales Alenia Space. 2007-06-19. Retrieved 2012-11-04.
- "Luch satellite". Russian Space Web. 2012-10-23. Retrieved 2012-11-04.