10_hygiea | orbitalperiod | 557 (days) <sep> hygiea (minor-planet designation: 10 hygiea) is a major asteroid and possible dwarf planet located in the main asteroid belt with a diameter of 434 kilometres (270 mi) and a mass estimated to be 3% of the total mass of the belt, it is the fourth-largest asteroid in the solar system by both volume and mass in some spectral classifications it is the largest of the dark c-type asteroids with a carbonaceous surface, whereas in others it is second after 1 ceres 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 the authors of the study therefore consider it a possible dwarf planet 
10 hygiea has an orbital period of 5.57 days.no information