 Lightcurve analysis gave a tentative rotation period of 14 hours (monomodal solution) with a brightness amplitude of 0.07 magnitude ().Alternatively, it has a bimodal period solution of 28 hours, which is considered more likely by the observers, but ignored by the Asteroid Lightcurve Data Base.According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, "Geramtina" measures 12.687 and 14.574 kilometers in diameter and its surface has an albedo of 0.251 and 0.1910, respectively.