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The Asteroid Redirect Mission (ARM), also known as the Asteroid Retrieval and Utilization (ARU) mission and the Asteroid Initiative, is a potential future space mission proposed by NASA. Still in the early stages of planning and development, the spacecraft would rendezvous with a large near-Earth asteroid and use robotic arms with anchoring grippers to retrieve a 6-meter boulder from the asteroid. The spacecraft will characterize the asteroid and demonstrate at least one planetary defense technique before transporting the boulder to a stable lunar orbit, where it could be further analyzed both by robotic probes and by a future manned mission. If funded, the mission would be launched in December 2020,〔〔 with the additional objectives to test a number of new capabilities needed for future human expeditions to deep space, including advanced ion thrusters. ==History== The ARU mission, excluding any manned missions to an asteroid which it may enable, was the subject of a feasibility study in 2012 by the Keck Institute for Space Studies. The mission cost was estimated by the Glenn Research Center at about $2.6 billion,〔NASA Solar System Exploration, (Asteroid Redirect Mission (ARM) ) (accessed September 30, 2014)〕 of which $105 million was funded in 2014 to mature the concept.〔(NASA 2014 budget proposal on ARU mission ). (PDF)〕 NASA officials emphasized that ARM was intended as one step in the long-term plans for a human mission to Mars. The two options studied to retrieve a small asteroid were Option A and Option B. Option A would deploy a large capture bag capable of holding a small asteroid up to in diameter,〔 and a mass of up to 500 tons.〔 Option B, which was selected in March 2015, would have the vehicle land on a large asteroid and deploy robotic arms to lift up a boulder up to in diameter from the surface, transport it and place it into lunar orbit.〔 This option was identified as more relevant to future rendezvous, autonomous docking, lander, sampler, planetary defense, mining, and spacecraft servicing technologies, such as a precursor mission to Phobos.〔(【引用サイトリンク】 url=examiner.com/article/idea-floated-to-send-the-asteroid-redirect-mission-to-phobos )〕 The crewed portion to retrieve asteroid samples from the Moon orbit (Orion EM-3) has been criticized as an unnecessary part of the mission, as thousands of meteorites have already been analyzed, and by claiming that the technology used to retrieve one boulder does not help develop a crewed mission to Mars.〔 The NASA Advisory Council suggested in 10 April 2015 that NASA should not carry out its plans for ARM, and suggested instead to develop solar electric propulsion and use it to power a spacecraft on a round-trip flight to Mars. 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「The Asteroid Redirect Mission (ARM), also known as the Asteroid Retrieval and Utilization (ARU) mission and the Asteroid Initiative, is a potential future space mission proposed by NASA. Still in the early stages of planning and development, the spacecraft would rendezvous with a large near-Earth asteroid and use robotic arms with anchoring grippers to retrieve a 6-meter boulder from the asteroid.The spacecraft will characterize the asteroid and demonstrate at least one planetary defense technique before transporting the boulder to a stable lunar orbit, where it could be further analyzed both by robotic probes and by a future manned mission. If funded, the mission would be launched in December 2020, with the additional objectives to test a number of new capabilities needed for future human expeditions to deep space, including advanced ion thrusters.==History==The ARU mission, excluding any manned missions to an asteroid which it may enable, was the subject of a feasibility study in 2012 by the Keck Institute for Space Studies. The mission cost was estimated by the Glenn Research Center at about $2.6 billion,NASA Solar System Exploration, (Asteroid Redirect Mission (ARM) ) (accessed September 30, 2014) of which $105 million was funded in 2014 to mature the concept.(NASA 2014 budget proposal on ARU mission ). (PDF) NASA officials emphasized that ARM was intended as one step in the long-term plans for a human mission to Mars. The two options studied to retrieve a small asteroid were Option A and Option B. Option A would deploy a large capture bag capable of holding a small asteroid up to in diameter, and a mass of up to 500 tons. Option B, which was selected in March 2015, would have the vehicle land on a large asteroid and deploy robotic arms to lift up a boulder up to in diameter from the surface, transport it and place it into lunar orbit. This option was identified as more relevant to future rendezvous, autonomous docking, lander, sampler, planetary defense, mining, and spacecraft servicing technologies, such as a precursor mission to Phobos.(【引用サイトリンク】 url=examiner.com/article/idea-floated-to-send-the-asteroid-redirect-mission-to-phobos )The crewed portion to retrieve asteroid samples from the Moon orbit (Orion EM-3) has been criticized as an unnecessary part of the mission, as thousands of meteorites have already been analyzed, and by claiming that the technology used to retrieve one boulder does not help develop a crewed mission to Mars. The NASA Advisory Council suggested in 10 April 2015 that NASA should not carry out its plans for ARM, and suggested instead to develop solar electric propulsion and use it to power a spacecraft on a round-trip flight to Mars.」の詳細全文を読む スポンサード リンク
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