The largest asteroids

The largest asteroid in this catalogue is 1 Ceres, with a radius of 469.7 km. Next are 20000 Varuna and 4 Vesta.

The four largest bodies in the asteroid belt hold roughly half its total mass, and all of it together would not make a Moon. Sizes come from the Small-Body Database and are best estimates, not measured diameters, for most of the list.