Asteroid
Although their location in the asteroid belt excludes them from planet status, the three largest objects, Ceres, Vesta, and Pallas, are intact protoplanets that share many characteristics common to planets, and are atypical compared to the majority of "potato"-shaped asteroids. The fourth largest asteroid, Hygiea, has an undifferentiated interior, like the majority of asteroids. Between them, the four largest asteroids constitute half the mass of the asteroid belt.
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.