 Lightcurve analysis gave a rotation period of hours with a brightness amplitude of magnitude ().The result supersedes period determinations of () by Robert Stephens in 2000, () by Laurent Bernasconi in 2005, and () by Janus Kozdon in 2015 ().According to the survey carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), "Gunhild" measures (), () and () kilometers in diameter and its surface has an albedo of (), () and (), respectively.