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| launch_rocket = Atlas V 551 (AV-029) | launch_site = Space Launch Complex 41 Cape Canaveral Air Force Station, Florida, United States | launch_contractor = Lockheed Martin | disposal_type = | last_contact = | decay_date = |interplanetary = |distance = }} | instruments_list = | insignia = 100px | insignia_caption = Juno mission insignia | insignia_alt = | insignia_size = }} ''Juno'' is a NASA New Frontiers mission to the planet Jupiter. ''Juno'' was launched from Cape Canaveral Air Force Station on August 5, 2011 and will arrive on July 4, 2016. The spacecraft is to be placed in a polar orbit to study Jupiter's composition, gravity field, magnetic field, and polar magnetosphere. ''Juno'' will also search for clues about how the planet formed, including whether it has a rocky core, the amount of water present within the deep atmosphere, how its mass is distributed, and its deep winds, which can reach speeds of .〔(Winds in Jupiter's Little Red Spot almost twice as fast as strongest hurricane )〕 The ''Juno'' spacecraft is powered by solar arrays, commonly used by satellites orbiting Earth and working in the inner Solar System, whereas radioisotope thermoelectric generators are commonly used for missions to the outer Solar System and beyond. For ''Juno'', however, three solar array wings, the largest ever deployed on a planetary probe, will play an integral role in stabilizing the spacecraft and generating power. The spacecraft's name comes from Greco-Roman mythology. The god Jupiter drew a veil of clouds around himself to hide his mischief, but his wife, the goddess Juno, was able to peer through the clouds and see Jupiter's true nature. == Overview == ''Juno'' is on a five-year cruise to Jupiter, with arrival expected on 4 July 2016. The spacecraft will travel over a total distance of roughly 2.8 billion kilometers (18.7 AU; 1.74 billion miles). The spacecraft will orbit Jupiter 37 times over the course of 20 months.〔 ''Junos trajectory used a gravity assist speed boost from Earth, accomplished through an Earth flyby two years (October 2013) after its August 5, 2011 launch.〔(【引用サイトリンク】 title=NASA's Shuttle and Rocket Launch Schedule )〕 In July 2016, the spacecraft will perform an orbit insertion burn to slow the spacecraft enough to allow capture into a 14-day polar orbit. Once in orbit, infrared and microwave instruments will begin to measure the thermal radiation emanating from deep within Jupiter's atmosphere. These observations will complement previous studies of its composition by assessing the abundance and distribution of water, and therefore oxygen. This data will provide insight into Jupiter's origins. ''Juno'' will also investigate the convection that drives general circulation patterns in Jupiter's atmosphere. Other instruments aboard ''Juno'' will gather data about its gravitational field and polar magnetosphere. The ''Juno'' mission is set to conclude in February 2018, after completing 37 orbits around Jupiter, when the probe will be de-orbited to burn up in Jupiter's outer atmosphere,〔 so as to avoid any possibility of impact and biological contamination of one of its moons.〔 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「Juno (spacecraft)」の詳細全文を読む スポンサード リンク
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