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Luch (satellite)
The ''Luch'' ((ロシア語: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, in a manner similar to that of the US Tracking and Data Relay Satellite System.
== History ==
The first generation of satellites was created by NPO-PM using the satellite platform "KAUR-4" (its first use) and had the code name "Altair" (index GUKOS - 11F669). The system was conceived as part of the second generation of the Global Satellite Data Relay Network (Глобальная Космическая Командно-Ретрансляционная система (GKKRS)) and was developed by decree of the Soviet Council of Ministers of February 17, 1976 (the other part of this decree authorized the construction of geostationary system "Geyser"). Five satellites have been built on this platform, but only four have been launched: Kosmos 1700, Kosmos 1897, Kosmos 2054 and ''Luch''-1, none of which are currently operational.〔(【引用サイトリンク】url= http://www.skyrocket.de/space/doc_sdat/luch.htm )〕 The fifth satellite has been, due to lack of funds for the launcher, donated to the A.S. Popov Central Museum of Communications in Saint Petersburg, Russia.
In the second generation of the satellites, code named “Gelios”, several improvements have been introduced. Nonetheless, due to lack of funds, only one satellite built on this platform has been launched: ''Luch''-2 1 (Gelios-12L) on September 11, 1995 – it stopped working in 1998.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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