 With a period above 100 hours, "Westphalia" is a slow rotator.While the slowest rotators have periods above 1000 hours, the vast majority of asteroids have periods between 2.2 and 20 hours.According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), the Infrared Astronomical Satellite IRAS, and the Japanese Akari satellite, "Westphalia" measures (), () and () kilometers in diameter and its surface has a very low albedo of (), () and (), respectively.