The bulk , composition and mass of LOCATION@1 are not known , but assuming that its mean density is like that of LOCATION@2 , -LRB- around NUMBER@1 g/cm ³ -RRB- its mass can be estimated at about NUMBER@2 kg .

What Adrastea is made of and the mass of LOCATION@1 are not known , but assuming that its mean density is like that of LOCATION@2 -LRB- ~ NUMBER@1 g/cm ³ -RRB- its mass can be estimated at ~ NUMBER@2 × NUMBER@3 kg .
