Kubva pane uchapupu hwema spectral, Hygiea inofungidzirwa kuti ine zvinhu zvekare zve carbonaceous zvakafanana neizvo zvinowanikwa mu carbonaceous chondrite meteorites. Zvigadzirwa zvekushandurwa kwemvura zvakaonekwa pamusoro payo, izvo zvinogona kuratidza kuvapo kwemvura yechando munguva yakapfuura iyo yaipisa zvakakwana kuti inyungudike. Iyo yekare yechiso chimiro inoratidza kuti Hygiea yakanga isina kunyungudika panguva yekutanga nguva yeSolar System, kusiyana nedzimwe mapuraneti makuru akaita se4 Vesta. Hygiea ndiyo nhengo huru yemhuri yeHygiea uye ine huwandu hwakawanda (inopfuura 90%) mumhuri iyi.
mhiri kweKirkwood gap