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Galaxy 15 is an American telecommunications satellite which is owned by Intelsat. It was launched for and originally operated by PanAmSat, and was subsequently transferred to Intelsat when the two companies merged in 2006. It was originally positioned in geostationary orbit at a longitude of 133° West, from where it was used to provide communication services to North America. In April 2010, Intelsat lost control of the satellite, and it began to drift away from its orbital slot, with the potential to cause disruption to other satellites in its path. On 27 December 2010, Intelsat reported that the satellite had rebooted as per design and the command unit was responding to commands again. In addition, the satellite had been secured in safe mode and the potential for interference issues from Galaxy 15 had ceased.〔(Galaxy 15 | Intelsat )〕 〔(FAQs | Galaxy 15 | Intelsat )〕 Intelsat repositioned Galaxy 15 back to its original location on April 4, 2011.〔http://www.gpsworld.com/gnss-system/augmentation-assistance/news/waas-prn-135-resumes-normal-operation-11243〕 ==Satellite== Galaxy 15 was constructed by Orbital Sciences Corporation, and was based around the Star-2 satellite bus. The contract for its manufacture was signed in 2001, and at the time it was to have been identical to the Galaxy 12 and Galaxy 14 satellites which were also on order. In 2003, the contract was changed to allow the addition of more transponders to support the US Government's Geostationary Communications and Control Segment(GCCS) Wide Area Augmentation System (WAAS) a US Federal Aviation Administration navigation program. The communications payload aboard Galaxy 15 consisted of 24 transponders operating in the G and H bands of the NATO electromagnetic spectrum, or the C band of the US IEEE spectrum. It also carried two C/D band (IEEE L band) transponders, which form part of the US Government's Geostationary Communications and Control Segment,〔(Geostationary Communications and Control Segment - Google Search )〕 and are used for aircraft navigation. At launch, the Galaxy 15 satellite had a mass of , and an expected operational lifespan of around 15 years. 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「Galaxy 15」の詳細全文を読む スポンサード リンク
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