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The Saturn Atmospheric Entry Probe is a mission concept under study since 2010, where a robotic spacecraft would deliver a single probe into Saturn to study its atmosphere.〔(【引用サイトリンク】 title=Saturn Entry probe )〕 Due to the orbits and relative positions of Saturn and Earth, launch is proposed for August 30, 2027 for a June 22, 2034 arrival.〔 The mission is under review in order to compete for funding by NASA's New Frontiers Program.〔〔(Saturn Atmospheric Entry Probe Trade Study. ) Reta Beebe. September 2010.〕〔NRC Space Studies Board Planetary Decadal Survey: "(Vision & Voyages for Planetary Science in the Decade 2013-2022 ),” (PDF). National Academies Press, March 7, 2011.〕 ==Overview== To unveil the processes of outer planet formation and Solar System evolution, detailed studies of the composition, structure, and dynamics of giant planet interiors and atmospheres would be necessary. To constrain the internal structure of gas giants, a combination of both ''in-situ'' entry-probe missions and remote-sensing studies of the giant planets would be needed.〔 The Saturn Atmospheric Entry Probe mission would consist of a carrier-relay spacecraft and a probe. The carrier-relay spacecraft would release the probe into Saturn, a gas giant, and provide data relay from the probe to Earth. The carrier-relay spacecraft would be on a flyby trajectory, so, unlike the ''Galileo'' spacecraft, it would need no orbit-insertion maneuver, continuing on a Solar System escape trajectory for spacecraft disposal.〔 The probe would determine the structure of the atmosphere as well as noble gas abundances and isotopic ratios of hydrogen, carbon, nitrogen, and oxygen.〔 〕〔 The probe would enter the atmosphere under a parachute and begin measurements at 0.1 bar (a bar is the atmospheric pressure at sea level on Earth). At 1 bar, the probe would detach from its parachute for a more rapid descent to 5 bar, and the end of the nominal mission after 55 minutes of data collection. The probe would be designed to survive to 10 bars of pressure at about 250 km deep in the atmosphere.〔〔 The suggested power source would be an Advanced Stirling Radioisotope Generator (ASRG).〔 After separation, the probe would be powered by battery alone. 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「Saturn Atmospheric Entry Probe」の詳細全文を読む スポンサード リンク
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