Lightcurves of 10 Hygiea, 241 Germania and 509 Iolanda

The asteroids 10 Hygiea, 241 Germania and 509 Iolanda have been studied photometrically. From their lightcurves, synodic periods of 27.63 +/- 0.02, 15.51 +/- 0.01 and 12.72 +/- 0.02 hours, and amplitudes of 0fm 28, 0fm 17 and 0fm 45, have been deduced for 10 Hygiea, 241 Germania and 509 Iolanda, respectively. The period found for 241 Germania is a significant revision from one previously published, and we present a first indication of pole orientation and shape. A synodic period is obtained for 509 Iolanda. The solution obtained for the sense of rotation, sidereal period, pole orientation and shape properties for 10 Hygiea confirms previous results.