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

The composition and mass of Metis are not known , but assuming that its mean density is like that of LOCATION@1 -LRB- ~ NUMBER@1 g/cm ³ -RRB- , its mass can be estimated as ~ NUMBER@4 × NUMBER@3 kg .
