Relations between residuals and m of U5 before and after halo removing. m is the angle between the direction of ascending node and satellite relative to Uranus. The ascending node is the point where the satellite, in its orbit, crosses the plane of the sky moving toward the observer. The “plane of the sky” is the plane through Uranus and perpendicular to the line of sight from the observer to Uranus. The overlapping positions in the “before halo removing” and “after halo removing” panels are enclosed in magenta circles.