Abstract

Trans-Neptunian Objects (TNOs) and Centaurs are thought to be the least thermally processed bodies in the Solar System. The study of their physical and dynamical properties represents an unique opportunity to analyse primordial material and to investigate the processes which governed planetary formation. An ESO Large Programme was carried out at VLT and NTT in order to improve our knowledge on the physical characteristics and the surface composition of these objects. A summary of the obtained results is here presented and discussed.