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TDRS-4
TDRS-4, known before launch as TDRS-D, is an American communications satellite which was operated by NASA as part of the Tracking and Data Relay Satellite System from 1989 until 2011. It was constructed by TRW, based on a custom satellite bus which was used for all seven of the first generation TDRS satellites.〔 〕 ==History==
TDRS-D was launched aboard during the STS-29R mission in 1989. ''Discovery'' launched from Launch Complex 39B at the Kennedy Space Center at 14:57:00 GMT on 13 March 1989. TDRS-D was deployed from ''Discovery'' a few hours after launch, and was raised to geostationary orbit by means of an Inertial Upper Stage.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「TDRS-4」の詳細全文を読む
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