The asteroids 23 Thalia, 40 Harmonia, 45 Eugenia, 54 Alexandra, 135 Hertha and 192 Nausikea have been studied by means of photoelectric photometry with the purpose of determining their rotation periods, pole orientation and shapes. The light curves of 23 Thalia and 40 Harmonia are shown. A new period is found for 40 Harmonia.