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  • 1
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    Mass-radius relationships in icy satellites (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Using published laboratory data for H2O ice, a modeling technique was developed by which the bulk density, density and temperature profile, rotational moment of inertia, central pressure, and location of the rock-ice interface can all be obtained as a function of the radius, the heliocentric distance, and the silicate composition. Models of the interiors of Callisto, Ganymede, Europa, Rhea, and Titan are given, consistent with present mass and radius data. The radius and mass of spheres of ice under self-gravitation for two different temperature classes are given (103 and 77 deg K). Measurements of mass, radius and I/MR2 by spacecraft can be interpreted by this model to yield substantial information about the internal structure and the ice/rock ratio of the icy satellites of Jupiter and Saturn.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 40; Nov. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Mass-radius relationships in icy satellites after Voyager (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Using improved data for the masses and radii of the satellites of Jupiter and Saturn, models accounting for self-compression effects are presented for the interiors of Europa, Ganymede, Callisto, Rhea, and Titan. For the differentiated models, two different possible scenarios for heat transport are treated, as well as two different compositions for the silicate component. Undifferentiated models are also treated. In each case, the models of Ganymede, Callisto, and Titan show noticeable similarities. It is found that estimates of the ice-rock ratio are dependent upon the assumptions made about the heat transport mechanisms, the rock composition, and on the distribution of rock and ice in the satellite's interior.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 52; Oct. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Mass-radius relationships and constraints on the composition of Pluto (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: With the new upper limit of Pluto's mass, an upper limit for Pluto's density of 1.74 g/cu cm has been found. Assuming Pluto to be 100% methane, available methane density data can be used to set a lower limit of 0.53 g/cu cm on Pluto's density, thus placing an absolute upper limit of 1909 km on the radius and a lower limit of 0.32 on the albedo. The results of 280 computer models covering a wide range of composition ratios of rock, water ice, and methane ice are reported. Limits are placed on Pluto's silicate content, and a simple spacecraft method for determining Pluto's water content from its density and moment of inertia is given. The low thermal conductivity and strength of solid methane suggest rapid solid-state convection in Pluto's methane layer.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 42; Apr. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Mass-radius relationships and constraints on the composition of Pluto. II (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A model of Pluto's interior is presented based on new estimates of its mass within the range of possible masses. The model is consistent with the most recent observations by Arnold et al., and calls for a silicate-poor, H2O ice-rock bulk composition of Pluto. The results of the Charon-Pluto eclipses will lead to a more conclusive constraint to Pluto's bulk composition.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 44; Oct. 198
    Format: text
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    NASA TECHNICAL REPORTS
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