sentences:  In March 1988, Polish astronomer Wiesław Z. Wiśniewski obtained a lightcurve of "Simonida" that gave a rotation period of 5.3 hours with a brightness variation of 0.26 magnitude ().In January 2004, astronomer A. Kryszczynska at Poznań Observatory measured a period of 5.2885 hours with an amplitude of 0.50 magnitude ().In January 2008, photometric observations by astronomers Martine Castets, Bernard Trégon, Arnaud Leroy and Raoul Behrend gave a rotation period of 5.16 hours with a brightness variation of 0.21 ().