抄録
Although the surface is covered with rocks and is apparently lack of fine regolith, Itokawa’s surface show darkening and reddening by space weathering. Experimental results suggest rocky meteorite fragments can be weathered. The presence of opposition effect in rocky terrain of Itokawa suggested that the surface would be covered by particulate materials or porous enough to scatter light. Itokawa-derived fine grains (some of which have nanophase iron) in Hayabusa sample capsule clearly indicate the presence of fine particles on the surface of Itokawa and their effect on the optical property of the asteroid.
