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MarcoPolo-R was a proposed space mission to return a sample of material to Earth from the surface of a Near Earth asteroid (NEA) for detailed study in laboratories. Selected together with three other missions for further study under the European Space Agency's Cosmic Vision program, the mission was in competition for a single slot (M3) in the plan and if successful, would have launch around 2022. The mission is derived from a previous proposal to ESA science programmes called Marco Polo, which was planned to be conducted in cooperation with the Japanese space agency JAXA. On February 19, 2014, the PLATO mission was selected over the other candidates in the programme, including MarcoPolo-R. The mission concept was rejected for fourth time in March 2015 for the "M" medium-class missions under Europe's "Cosmic Vision" programme. ==Potential targets== The baseline target of the MarcoPolo-R is the near-Earth asteroid (341843) 2008 EV5. Prior to late 2012, the mission had been planned to go to the binary asteroid (175706) 1996 FG3 and EV5 was a backup target .〔http://www.oca.eu/MarcoPolo-R/Targets/MarcoPolo-RMissionTargets.html Potential Targets of MarcoPolo-R Mission〕 Cost and engineering constraints led to the change to EV5, which allows a much shorter mission while still meeting the project's science goals.〔https://www.oca.eu/MarcoPolo-R/NewsLetters/MarcoPolo-R_NewsLetters.html〕 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「MarcoPolo-R」の詳細全文を読む スポンサード リンク
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