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| insignia = Dawn logo.png | insignia_caption = ''Dawn'' mission patch | insignia_alt = | insignia_size = 200px }} ''Dawn'' is a space probe launched by NASA in September 2007 with the mission of studying two of the three known protoplanets of the asteroid belt, Vesta and Ceres. It is currently in orbit about its second target, the dwarf planet Ceres. ''Dawn'' is the first spacecraft to orbit two extraterrestrial bodies, the first spacecraft to visit either Vesta or Ceres, and also the first to visit a dwarf planet, arriving at Ceres in March 2015, a few months before ''New Horizons'' flew by Pluto in July 2015. ''Dawn'' entered Vesta orbit on July 16, 2011, and completed a 14-month survey mission before leaving for Ceres in late 2012. ''Dawn'' entered Ceres orbit on March 6, 2015, and is predicted to remain in orbit perpetually after the conclusion of its mission.〔 The ''Dawn'' mission is managed by NASA's Jet Propulsion Laboratory, with spacecraft components contributed by European partners from the Netherlands, Italy and Germany. It is the first NASA exploratory mission to use ion propulsion, which enabled it to enter and leave the orbit of multiple celestial bodies. Previous multi-target missions using conventional drives, such as the ''Voyager'' program, were restricted to flybys. ==Project history== 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「Dawn (spacecraft)」の詳細全文を読む スポンサード リンク
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