宇宙航空研究開発機構(JAXA)は4月22日、2006年1月24日に打ち上げられた陸域観測衛星「だいち」(ALOS)が、急な発生電力の低下とともに、軽負荷モード(LLM)に移行し、制御不能な状況に陥っていることを発表した。「だいち」の設計寿命3年、目標寿命5年で、すでに寿命を超えて運用され、3月11日に発生した東北地方太平洋沖地震(東日本大震災)でも被災地の状況確認のために400枚以上の撮影を行うなど災害観測などで活用されていた。 JAXAでは、搭載観測機器の電源がオフ状態になり「だいち」がLLMモードに移行してることを22日7時30分(日本時間)ころに、データ中継衛星「こだま」(DRTS)による中継データから確認した。 その後、詳細な調査を実施、4月22日3時44分〜同58分(ユニバーサル時間:UT)の期間、サンチャゴ地上局において、HKRDI(データレコーダ)のダウンリンクを実施、異常
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