2197 Shanghai
2197 Shanghai, provisional designation, is a carbonaceous Themistian asteroid from the outer region of the asteroid belt, approximately 22 kilometers in diameter.
The asteroid was discovered on 30 December 1965, by astronomers at the Purple Mountain Observatory in Nanjing, China, and named after the city of Shanghai.
Orbit and classification
Shanghai is a member of the Themis family, a dynamical family of outer-belt asteroids with nearly coplanar ecliptical orbits. It orbits the Sun at a distance of 2.8–3.6 AU once every 5 years and 7 months. Its orbit has an eccentricity of 0.13 and an inclination of 2° with respect to the ecliptic.Physical characteristics
The dark body has been characterized as a C-type asteroid.Rotation period
In December 2010, a rotational lightcurve of Shanghai was obtained for this asteroid from photometric observations taken at the U.S. Palomar Transient Factory in California. It gave a rotation period of hours with a brightness variation of 0.16 magnitude.One month later in January 2011, a similar period of hours with an amplitude of 0.16 magnitude was derived by French amateur astronomer Pierre Antonini.