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28 March 2024
 
  » pubmed » pmid15919987

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Amalthea's density is less than that of water
John D Anderson ; Torrence V Johnson ; Gerald Schubert ; Sami Asmar ; Robert A Jacobson ; Douglas Johnston ; Eunice L Lau ; George Lewis ; William B Moore ; Anthony Taylor ; Peter C Thomas ; Gudrun Weinwurm ;
Date 27 May 2005
Journal Science, 308 (5726), 1291-3
AbstractRadio 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) x 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) x 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.
Source PubMed, pmid15919987 doi: 10.1126/science.1110422
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