The Trans-Neptunian Objects (TNOs) are very difficult to observe due to their faintness. Spectra can be obtained for only few objects. For this reason, broad band photometry is the only available technique to study their physical properties from a statistical point of view. To improve the knowledge about the physical nature of the Kuiper Belt, we have obtained several observing runs at different four-meter class telescopes (NTT - Chile; CFHT - Hawaii).
The data presented here were obtained at NTT (ESO - Chile) during three observing runs from 1997 to 2000. We used the SUSI and SUSI 2 CCD cameras with the Bessel B, V, R, and I filters.