In a first step Itokawa samples will be placed in a dedicated setup in UHV chamber in order to characterize their charging state under strictly controlled plasma (simulating properties of Solar wind type electrons and ions populations) and Solar UV photons environments. Secondary emission from the grains will also be charaterized. In a second step we will measure surface energy of the grains in various configurations using different support materials. The results will help a great deal to understand regolith charging structure of the upper layers under varying space environment and improve grains transport models at the surface of small objects. Whats more in a last step (TBC) we might also characterize the effect of irradiating some of the samples with high energy particles (e.g. protons).