Asteroid
The dwarf planet Ceres is by far the largest asteroid, with a diameter of . The next largest are 4 Vesta and 2 Pallas, both with diameters of just over . Vesta is the only main-belt asteroid that can, on occasion, be visible to the naked eye. On some rare occasions, a near-Earth asteroid may briefly become visible without technical aid; see 99942 Apophis.
Potentially hazardous object
With a mean-diameter of approximately 7 kilometers, the Apollo asteroid is likely the largest known potentially hazardous object, despite its fainter absolute magnitude of 15.2, compared to other listed objects in the table below "(note: calculated mean-diameters in table are inferred from the objects brightness and its (assumed) albedo. They are only an approximation.)". The lowest numbered PHA is 1566 Icarus.