Rotation period and photoelectric lightcurves of asteroids 68 Leto and 563 Suleika

Asteroids 68 Leto and 563 Suleika were observed photometrically during their 1978 opposition with the 50 cm telescope of the European Southern Observatory (Chile). The rotation lightcurve of 68 Leto displays three identifiable maxima and minima and the synodic period of rotation is found. For 563 Suleika the derived synodic period of rotation is found and its lightcurve shows two nearly symmetric maxima and minima. The color indices measured for 68 Leto and 563 Suleika are given. There are no trends of variation exceeding the mean scatter of the observations. (12 refs).