| Luch 5B | |
| Mission Type: | Communications |
| Operator: | Roskosmos |
| Cospar Id: | 2012-061A |
| Satcat: | 38977 |
| Mission Duration: | 10 years |
| Spacecraft Bus: | Ekspress-1000AM |
| Manufacturer: | JSC Information Satellite Systems |
| Launch Date: | UTC |
| Launch Site: | Baikonur 81/24 |
| Orbit Reference: | Geocentric |
| Orbit Regime: | Geosynchronous |
| Apsis: | gee |
Luch 5B (meaning ray and sometimes transliterated as Loutch-5B) is a Russian Luch relay satellite which transmits data from the Russian Orbital Segment of the International Space Station, and from other satellites in low Earth orbit. It is in geosynchronous orbit.
Luch 5B is one of three Luch relay satellites. Luch 5A was launched on 11 December 2011 and Luch 5V was launched on 28 April 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 5B was built by JSC Information Satellite Systems using the Ekspress-1000A bus. It has 4 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 has a "laser-radio channel".
The satellite is designed to relay data from the ISS, satellites in low earth orbit and rocket launch vehicles.
Luch 5B is located at 16° W.
Luch 5B was launched on 2 November 2012 with satellite Yamal 300K. It was launched from Baikonur Cosmodrome launchpad 81/24 by a Proton-M rocket with a Briz-M upper stage. It was launched at 21:04 UTC and after four burns of the Briz-M upper stage it was placed into geosynchronous transfer orbit at 06:33 UTC on 3 November.
The launch was delayed from 30 August 2012 due to the failure of the launch of Telkom-3 and Ekspress MD2 in August 2012.