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It is suggested that a recent determination of the mass and density of Pluto from observations of Neptune may be strongly influenced by small errors in the mass of Uranus or Saturn. The general agreement of the visually observed value for the diameter of Pluto (Kuiper 1950) with the upper limit derived from a near-occultation event (Halliday, Hardie, Franz, and Priser 1966) suggests that a value of 5500 km is most probably within 20 percent of the true value. A recent analysis of observationsdoi:10.1086/128778 fatcat:3f75ei6gu5fihndtx5rkozm33y