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Kounotori 4, also known as HTV-4, was the fourth flight of the H-II Transfer Vehicle, an unmanned cargo spacecraft launched in August 2013 to resupply the International Space Station. It launched from Tanegashima Space Center aboard H-IIB rocket on August 3, 2013 and connected to ISS by August 9, 2013; it carried 5.4 tons of cargo.〔(NASA - Japanese Cargo Craft Captured, Berthed to Station (2013) )〕 Kounotori 4 undocked on September 4, 2013 and was destroyed by reentry on 7 September 2013. ==Specifications== Major changes of Kounotori 4 from previous HTV are: * Although the previous Kounotori 3 used RCS thrusters by IHI Aerospace, Kounotori 4 uses the RCS manufactured by Aerojet, similar to HTV-1 and 2. This will be the last Kounotori to use Aerojet parts, and future Kounotori are to use IHI's. * One of the solar panels was replaced with a sensor module to measure the surface electrical potential when berthing to ISS.〔(【引用サイトリンク】url=http://iss.jaxa.jp/en/htv/mission/htv-4/feature/ )〕 * Continued improvement of ground operation to allow more late access cargo. * First time for Kounotori to reenter atmosphere with unpressurized waste cargo (a NASA engineering experiment module STP-H3). * The orbital trajectory after departure from ISS is adjusted so that the reentry is to coincide with ISS passing over, to allow the reentry to be observed from ISS. 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「Kounotori 4」の詳細全文を読む スポンサード リンク
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