Lightcurves from different aspects, as an asteroid orbits, provide information about spin period, axis orientation and body shape. 10 Hygiea is a well observed asteroid. It has been observed in eight oppositions. However, 241 Germania has been observed in only two oppositions and there was no previous lightcurve available for 509 Iolanda.
In this paper we present lightcurves of 10 Hygiea, 241 Germania and 509 Iolanda taken during September-October 1996 from the observatory of Sierra Nevada, Spain. Simultaneous uvby photometry was obtained and used to derive Strömgren and Johnson reduced magnitudes and colour indices. Rotational and shape parameters are obtained for 10 Hygiea that confirm previous results. New indications about the pole orientation and the shape parameters for 241 Germania are presented and a synodic period is estimated for 509 Iolanda.
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