... M e th o d s. Using FORS1 of the ESO VLT, we have obtained linear-polarization measurements in the Bessell R filter for five TNOs at different values of their phase angle (i.e., the angle between the Sun, the object, and the Earth). ... 2008). ... Our new observations have proved that the high negative polarization at small phase angles is quite typical for TNOs, as three newly observed objects have shown a polarimetric behaviour similar to that of Ixion. ...