 In February 2008, a rotational lightcurve of "Lilium" was obtained from photometric observations by American astronomer Brian Warner at his Palmer Divide Observatory () in Colorado.Lightcurve analysis gave a longer-than average rotation period of 24.60 hours with a brightness amplitude of 0.25 magnitude (), superseding a period of 17.63 hours by Richard Binzel from March 1984 ().According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, "Lilium" measures between 37.78 and 52.79 kilometers in diameter and its surface has an albedo between 0.030 and 0.05.