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Science 15 November 1968:
Vol. 162. no. 3855, pp. 800 - 803
DOI: 10.1126/science.162.3855.800
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Articles

Mass of Pluto

R. L. Duncombe 1, W. J. Klepczynski 1, and P. K. Seidelmann 1

1 Nautical Almanac Office, U.S. Naval Observatory, Washington, D.C. 20390

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.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)