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Juno II : ウィキペディア英語版
Juno II

Juno II was an American space launch vehicle used during the late 1950s and early 1960s. It was derived from the Jupiter missile, which was used as the first stage.
==Development==
Solid rocket motors derived from the MGM-29 Sergeant were used as upper stages—eleven for the second stage, three for the third stage, and one for the fourth stage—the same configuration as used for the upper stages of the smaller Juno I rocket. On some launches to low Earth orbit the fourth stage was not flown, allowing the rocket to carry an additional nine kilograms of payload. Development of the Juno II was extremely fast due to being completely built from existing hardware. The project began in early 1958 and the first vehicle flew at the end of the year.
Chrysler was responsible for the overall contract, while Rocketdyne handled the first stage propulsion and Jet Propulsion Laboratory handled the upper stage propulsion.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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