NOTE: Saturn Ring-Plane Crossing, May 1995: Pole Precession and Ring Thickness

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Scientific paper

On 22 May 1995, as the Earth crossed through Saturn's ring-plane, we used the Wide Field Planetary Camera 2 on the Hubble Space Telescope to image Saturn and its rings for 10 hr centered near the predicted time of ring-plane crossing. By performing photometry on the rings, we find that the time of ring-plane crossing is later than the nominal predicted time, suggesting that Saturn's pole is precessing at a rate somewhat slower than is predicted for a rigid body under the influence of torques from the Sun and Saturn's satellites and/or that Saturn's pole position is different from the nominal position. We determine the equivalent thickness of the rings to be 1.4 +/- 0.1 km, and find that the measured value corresponds to the amplitude of perturbations from the Laplace plane warp and satellite-induced bending waves.

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