He ahua koreutu a Adrastea, 20×16×14 km te whanui. Ko te tatauranga o te mata kei waenga i te 840 me te 1,600 (~ 1,200) km2. Koinei te mea iti rawa o nga marama e wha o roto. Kaore i te mohiotia te nuinga, te hanganga me te papatipu o Adrastea, engari ki te whakaaro he rite te tatauranga o Amalthea, tata ki te 0.86 g / cm3, ka taea te whakatau tata ki te 2 × 1015 kg. Ko te taumaha o Amalthea e tohu ana ko te marama he wai te hukapapa me te porosity o te 10<unk>15%, a he rite pea a Adrastea. Kaore he taipitopito o te mata o Adrastea e mohiotia ana, na te iti o nga whakaahua o te taumira e waatea ana. Patai: he aha te tatauranga surace
i waenganui i te 840 me te 1,600