Path of the Centaur 2006 RJ2 in the frame that rotates with Saturn. X, Y, and Z are the cartesian axes of the Saturn’s rotating frame. The X-axis points from Sun to Saturn and Z-axis is vertical to Saturn’s orbital plane. Saturn is presented as the green filled circle. Panel a: path of 2006 RJ2 in Saturn’s rotating frame viewed from the Z-axis direction. The black dotted curve is the Saturn’s orbit in the inertial reference frame. Panel b: motion of 2006 RJ2 viewed from the Y-axis direction. The blue curve represents the motion of 2006 RJ2 above the Saturn’s orbital plane while the red curve means the opposite.