Rigs_and_VesselsConstellation wins new Petrobras rig contract off BrazilPetrobras agrees to charter semi-submersible unit Atlantic Star for work in the Campos basinNew contract: from Petrobras the Constellation Oil Services semi-submersible rig Atlantic StarPhoto: EOIN O'CINNEIDE/UPSTREAMFabio PalmigianiRio de Janeiro