Original: It is probably the fifth most massive asteroid after Ceres , Vesta , Pallas , and Hygiea , with a mass estimated to be 1.2 % of the mass of the entire asteroid belt .
Simplified: It is the fifth heaviest asteroid after Ceres , Vesta , Pallas and Hygiea , and scientists think that it makes up 2.0 % of the mass of the whole asteroid belt .