SYSTEM DESIGN OF HAYABUSA2 –ASTEROID SAMPLE RETURN MISSION TO 1999JU3

摘要

The Japan Aerospace Exploration Agency is now developing the second asteroid sample return mission"Hayabusa2." Following the successful return back of Hayabusa from the asteroid Itokawa, Hayabusa2 aims at around trip mission to the asteroid 1999JU3.1999JU3 is a C-type asteroid, which is supposed to contain organicmatters and hydrated minerals. Thus it is expected that, after the successful sample collection, we could acquire moreknowledge on the origin and evolution of the planets, especially the origin of water and organic matters. The currentmission scenario enables the spacecraft to reach 1999JU3 in the middle of 2018, and performs an asteroid proximityoperation for 1.5 years. Three touch downs for sampling and one 2m class-crater generation by a high-speed impactoperation are planned during the asteroid proximity operation. The sample is to be brought back to the Earth by there-entry capsule. This paper describes the system design of Hayabusa2, some key technical challenges of the missionand the development status.