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H-IIA (H2A) is an active expendable launch system operated by Mitsubishi Heavy Industries (MHI) for the Japan Aerospace Exploration Agency. The liquid-fueled H-IIA rockets have been used to launch satellites into geostationary orbit, to launch a lunar orbiting spacecraft, and to launch an interplanetary space probe to Venus. Launches occur at the Tanegashima Space Center. The H-IIA first flew in 2001 and has been launched 28 times by March 2015. Production and management of the H-IIA shifted from JAXA to MHI on April 1, 2007. Flight 13, which launched the lunar orbiter SELENE, was the first H-IIA launched after this privatization.〔(【引用サイトリンク】title=Mitsubishi and Arianespace Combine Commercial Satellite Launch Services )〕 The H-IIA is a derivative of the earlier H-II rocket, substantially redesigned to improve reliability and minimize costs. There are currently two (formerly four) different variants of the H-IIA in active service for various purposes. A derivative design, the H-IIB, was developed in the 2000s and made its maiden flight in 2009. The success rate of 95% of the H-2A is on a par with 96.4 percent for the Atlas V of the United States and 95.2 percent for the European Ariane 5.〔(【引用サイトリンク】publisher=The Asahi Shimbun ) (Archived by WebCite® at http://www.webcitation.org/63tfmFtGR〕 == Vehicle description == The launch capability of an H-IIA launch vehicle can be enhanced by adding SRB-A (solid rocket booster or SRB) and Castor 4AXL (solid strap-on booster or SSB) to its basic configuration, creating a "family". The models are indicated by three or four numbers following the prefix "H2A". The first number in the sequence indicates the number of stages; the second the number of liquid rocket boosters (LRBs); the third the number of SRBs; and, if present, the fourth number shows the number of SSBs. The first two figures are virtually fixed at "20", as H-IIA is always two-staged, and the plans for LRBs were cancelled and superseded by the H-IIB. 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「H-IIA」の詳細全文を読む スポンサード リンク
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