The Dwarf Planet Ceres. The only dwarf planet in the inner solar system. It is found between Mars and Jupiter. This dwarf planet was first discovered in 1801. Became classified as a "Dwarf planet in 2006- along with Pluto and Eris.
Ceres is the first dwarf planet from the sun, but it was considered the fifth planet from the sun for nearly fifty years after it was first discovered in 1801.