[10] 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 (U=2).
[7] 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 (U=3-).
[6] According to the space-based Japanese Akari satellite, Simonida measures 12.16 kilometers in diameter, and its surface has an albedo of 0.211.
[5] The Collaborative Asteroid Lightcurve Link, however, agrees with the results obtained by 8 observations of the Infrared Astronomical Satellite IRAS, that gave a diameter of 11.08 kilometers and an albedo of 0.25 with an absolute magnitude of 11.9.
[3][4] This minor planet was named for Byzantine princess and queen consort Simonida, the wife of medieval Serbian king Stefan Milutin and symbol of beauty in former Yugoslavia.