Amalthea's Density Is Less Than That of Water-Reference-Cited by-同舟云学术

Amalthea's Density Is Less Than That of Water

Published:2005-05-27 Issue:5726 Volume:308 Page:1291-1293
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Anderson John D.¹²³⁴⁵,Johnson Torrence V.¹²³⁴⁵,Schubert Gerald¹²³⁴⁵,Asmar Sami¹²³⁴⁵,Jacobson Robert A.¹²³⁴⁵,Johnston Douglas¹²³⁴⁵,Lau Eunice L.¹²³⁴⁵,Lewis George¹²³⁴⁵,Moore William B.¹²³⁴⁵,Taylor Anthony¹²³⁴⁵,Thomas Peter C.¹²³⁴⁵,Weinwurm Gudrun¹²³⁴⁵

Affiliation:

1. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109-8099, USA.

2. Department of Earth and Space Sciences, University of California, Los Angeles, CA 90095-1567, USA.

3. Institute of Geophysics and Planetary Physics, Los Angeles, CA 90095-1567, USA.

4. Center for Radio Physics and Space Research, Cornell University, Ithaca, NY 14853-4901, USA.

5. Institute of Geodesy and Geophysics, Vienna University of Technology, A-1040 Vienna, Austria.

Abstract

Radio Doppler data from the Galileo spacecraft's encounter with Amalthea, one of Jupiter's small inner moons, on 5 November 2002 yield a mass of (2.08 ± 0.15) × 10 18 kilograms. Images of Amalthea from two Voyager spacecraft in 1979 and Galileo imaging between November 1996 and June 1997 yield a volume of (2.43 ± 0.22) × 10 6 cubic kilometers. The satellite thus has a density of 857 ± 99 kilograms per cubic meter. We suggest that Amalthea is porous and composed of water ice, as well as rocky material, and thus formed in a cold region of the solar system, possibly not at its present location near Jupiter.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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