Luch (satellite)
Russian data relay system / From Wikipedia, the free encyclopedia
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This article is about the communications spacecraft. For the Lunar lander, see Altair (spacecraft). For the 2014 Russian signal intelligence satellite also known as"Luch", see Olymp-K.
The Luch (Russian: Луч; lit. Ray) Satellite Data Relay Network (SDRN), also referred to as Altair and Gelios, is a series of geosynchronous Russian relay satellites, used to transmit live TV images, communications and other telemetry from the Soviet/Russian space station Mir, the Russian Orbital Segment (ROS) of the International Space Station and other orbital spacecraft to the Earth,[1] in a manner similar to that of the US Tracking and Data Relay Satellite System.