Demeter is the largest asteroid in the zone between Mars and Jupiter and was the first to be found in 1801, even as a planet at that time. In the 1850s, it was categorized as an asteroid, but in 2006, it was reclassified as a dwarf planet. While no longer classified as an asteroid, it claims the top with a diameter of 580 miles. Ceres takes its name from the Roman goddess of corn and harvest and the term cereals comes from the same root. It took Demeter 1,682 Earth days, or 4.6 years, to complete one orbit around the sun. Every nine hours, it completes a rotation around its axis.
