10 Hygiea is the fourth largest main belt asteroid. It was discovered in 1849 by the Italian astronomer Annibale de Gasparis (1819–1892).

 

Observations taken with the Very Large Telescope's SPHERE imager in 2017 and 2018, and announced in late 2019, revealed that Hygiea is nearly spherical and is close to a hydrostatic equilibrium shape 

diameter	443 km
spectral class	C
semimajor axis	3.138 AU
perihelion	2.763 AU
aphelion	3.513 AU
eccentricity	0.119
inclination	3.84°
period	5.56 years