 Several rotational lightcurves have been obtained from photometric observations since the 1980s, when "Priamus" was first observed by William Hartmann (1988) and Stefano Mottola (1993).The best rated result from July 2010, by Robert Stephens at GMARS and Linda French at Illinois Wesleyan University using the 0.9-meter SMARTS telescope at CTIO in Chile, gave a well-defined rotation period of hours with a consolidated brightness variation between 0.23 and 0.40 in magnitude ().In January 1993 and October 2001, two lightcurves were obtained by Stefano Mottola in collaboration with Claes-Ingvar Lagerkvist and Marco Delbo at Kvistaberg and Pino Torinese observatories, respectively ().