 During the same apparition, Tom Polakis at the Command Module Observatory in Arizona obtained a somewhat longer period of hours with a brightness variation of magnitude ().The result supersedes an incorrect period of hours with an amplitude of magnitude from a tentative one-night observation by French amateur astronomers Paul Krafft, Olivier Gerteis, Hubert Gully, Luc Arnold and Matthieu Bachschmidt from 2013 ().According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), "Fanny" measures () and () kilometers in diameter and its surface has an albedo of () and (), respectively.