Mass of Pluto

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Science  15 Nov 1968:
Vol. 162, Issue 3855, pp. 800-803
DOI: 10.1126/science.162.3855.800


Analysis of the observations of Neptune indicates a reciprocal mass of Pluto of 1,812,000 (0.18 Earth masses). If the density is the same as that of Earth, the diameter would be 7200 kilometers. If 6400 kilometers is accepted (from other sources) as the upper limit of the diameter, then Pluto must be at least 1.4 times as dense as Earth.