 In September 2013, a rotational lightcurve of "Manto" was obtained from photometric observations by Frederick Pilcher at the Organ Mesa Observatory , New Mexico, in collaboration with Eduardo Manuel Alvarez, Andrea Ferrero, Daniel Klinglesmith and Julian Oey Lightcurve analysis gave an exceptionally long rotation period of hours with a notably high brightness amplitude of magnitude, indicative of an elongated shape ().With a period above 100 hours, the asteroid is a slow rotator.The result supersedes observations by Alain W. Harris from July 1981, and by astronomers at the Intermediate Palomar Transient Factory in California ().