1 Ceres
Diameter 950 km
590 mi.
Distance from the Sun 413 million km
257 million mi.
Number of moons 0
Length of day 9 hours
Length of year 4 years
Atmosphere Components Any

Ceres is the largest asteroid in the inner Solar System. It is a rock–ice and the smallest identified dwarf planet. Ceres was discovered on January 1, 1801 by astronomer Giuseppe Piazzi, a monk in Sicily and the founding director of the Palermo Astronomical Observatory. Ceres was found within a gap between Mars and Jupiter where a planet was expected to reside, based on the spacing of the known planets in the solar system.