1310 Villigera
1310 Villigera, provisional designation , is a stony asteroid and large Mars-crosser from the innermost regions of the asteroid belt, approximately 14 kilometers in diameter. It was discovered on 28 February 1932, by German astronomer Friedrich Schwassmann at Bergedorf Observatory in Hamburg, Germany. The asteroid was named after astronomer Walther Villiger. Orbit and classification Villigera is a Mars-crossing asteroid, a dynamically unstable group between the main belt and the near-Earth populations, crossing the orbit of Mars at 1.666 AU. It orbits the Sun in the inner main-belt at a distance of 1.5–3.2 AU once every 3 years and 8 months (1,352 days). Its orbit has an eccentricity of 0.36 and an inclination of 21° with respect to the ecliptic. No precoveries were taken, and no prior identifications were made. The body's observation arc begins 10 days after its official discovery observation with its first used observation at Uccle Observatory. Physical characteristics Villigera is a common S-type asteroid on the Tholen taxonomic scheme. Lightcurves In October 2001, a first rotational lightcurve of Villigera was obtained by astronomer Robert Koff at Thornton Observatory () in Colorado. Light curve analysis gave a well-defined rotation period of 7.830 hours with a brightness variation of