Asteroid Hygiea May Be Smallest Dwarf Planet in Our Solar System
Hygiea is the Smallest Dwarf Planet
Astronomers think Hygiea is the Solar System's smallest dwarf planet
10 Hygiea is the fourth-largest asteroid in the Solar System by volume and mass, and it is located in the asteroid belt. With somewhat oblong diameters of 350–500 kilometres (220–310 mi) and a mass estimated to be 2.9% of the total mass of the belt, it is the largest of the class of dark C-type asteroids with a carbonaceous surface.