Surface Thermal Structure of the Itokawa estimated by Ground-Based Observation

Abstract

Thermal inertia of the (25143) Itokawa has observed on the ground observation. As the (25143)Itokawa has high thermal inertia (~750-1000J/m²/s^0.5/K) from the results of the ground observation, it is thought that there are no regolith on the it's surface and it is covered by naked rock. We will show the existence possibility of the regolith assuming two layers model even the body has high thermal inertia.