Orientation, location, and velocity of Saturn's bow shock: Initial results from the Cassini spacecraft - Achilleos,N; Bertucci,C; Russell,CT; Hospodarsky,GB; Rymer,AM; Arridge,CS; Burton,ME; Dougherty,MK; Hendricks,S; Smith,EJ; Tsurutani,BT (JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 2006)