Answer: 293.91 mi and 567 miles in diameter
Explanation: Ceres, dwarf planet, the largest asteroid in the main asteroid belt, and the first asteroid to be discovered. Ceres was found, serendipitously, by the Italian astronomer Giuseppe Piazzi of the Palermo Observatory on January 1, 1801.
With a radius of 296 miles (476 kilometers), Ceres is 1/13 the radius of Earth. If Earth were the size of a nickel, Ceres would be about as big as a poppy seed. From an average distance of 257 million miles (413 million kilometers), Ceres is 2.8 astronomical units away from the Sun.