Hayabusa was successful

Even though it collected miniscule dust grains of asteroid Itokawa, the Hayabusa probe was successful and told us more about what it was made of:

Japanese asteroid mission a success

What scientists found in the Itokawa sample is unequivocal evidence that this type of asteroid is the parent of ordinary chondrites - the most common type of meteorites found on Earth. Space weather morphs asteroid fragments and when they enter Earth's atmosphere they burn up as meteors, changing their chemical nature a bit. That's why they are referred to as meteorites.

The Japanese's pristine sample has helped distinguish the original material on the rock and how it changed when it entered Earth's atmosphere. That is helpful to understanding the origin and evolution of the planet and the solar system.

3 yea's for Hayabusa, the satellite mission that wouldn't quit.