Orbiting around Itokawa (3)

Specifically, at the time of arrival at Itokawa, Hayabusa had driven its proprietary new ion engines for 26.000 hours, including their operation during an Earth flyby.
It has also perfectly completed a period of hybrid optical navigation followed by
precise guidance and navigation of the spacecraft during its station keeping period around Itokawa.

These engineering achievements are the primary mission of Hayabusa and their successful completion is a great achievement.