Abstract
We present a robust method for measuring the effective plane of the Kuiper belt. The derived plane has an inclination with respect to the ecliptic of 186 and an ascending node of 816, with a 1 σ error in pole position of the plane of 037. The plane of the Kuiper belt is inconsistent with the invariable plane, the plane of Jupiter, and the plane of Neptune at the greater than 3 σ level. Using linear secular perturbation theory, we show that the plane of the Kuiper belt is expected to oscillate about the position of the invariable plane with a period of 1.9 million years and an amplitude of 12. The present predicted position of the plane of the Kuiper belt has an inclination with respect to the ecliptic of 174 and an ascending node of 867, within 020 of our measured position.
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