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| landing_date = | landing_site = | programme = | previous_mission = Hodoyoshi 4 | next_mission = }} PROCYON (Proximate Object Close flyby with Optical Navigation) is an asteroid flyby probe that was launched together with Hayabusa 2 on 4 December 2014 13:22:04 (JST). It was developed by University of Tokyo and JAXA. It is a small (approx. 60 cm cube), low cost () spacecraft. It was intended to flyby the asteroid 2000 DP107 in 2016, but the plan was abandoned due to the malfunction of the ion thruster.〔 ==Mission overview== PROCYON was launched as secondary payload together with the Hayabusa 2 asteroid landing probe. After separation from the carrier rocket, PROCYON was left on the heliocentric orbit, where it is going to perform a deep-space maneuver (DSM) using an experimental ion engine. After imparting 95 m/s of delta-v and spending 20% of the on-board xenon propellant, PROCYON will perform an Earth flyby in December 2015. This flyby will allow PROCYON to transition to a trajectory passing closer to the main asteroid belt. Before the flyby, a specific asteroid will be selected, and Earth flyby parameters will be adjusted accordingly. The rest of the xenon propellant will be used between the Earth flyby and asteroid flyby to ensure a controlled flyby distance of 30 km. It uses a lightweight (10 kg) combined system for propulsion and attitude control, utilizing the same xenon tank for the main ion engine and 8 cold-gas attitude control thrusters. 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「PROCYON」の詳細全文を読む スポンサード リンク
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