Ceres is a known body.
Ceres (dwarf planet) . Its diameter is approximately 945 km , making it the largest of the minor planets within the orbit of Neptune . The 33rd-largest known body in the Solar System , it is the only dwarf planet within the orbit of Neptune.Due to its eccentric orbit , the dwarf planet Pluto was also within the orbit of Neptune from 1979 to 1999 , and will be again from approximately 2227 to 2247 .