Original: It is likely the sixth most massive asteroid after Ceres , Vesta , Pallas , Hygiea , and 511 Davida with a mass estimated to be 1.2 % of the mass of the entire asteroid belt .
Simplified: It is the fifth most heaviest asteroid after Ceres , Vesta , Pallas and Hygiea with a mass thought to be 2.0 % of the mass of the whole asteroid belt .