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  • ASTRONOMY  (1)
  • Astronomy; Lunar and Planetary Science and Exploration  (1)
  • 1
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    A theory of satellite sweeping (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A theory of energetic charged particle absorption by insulating moons is presented that includes gyrophase dependence of the absorption probability when the gyroradius is not small compared to the satellite radius. This effect increases the average lifetime against absorption by factors of approximately 2 to 6 above previous estimates at Saturn. The sweeping lifetime then becomes significantly greater than the strong diffusion lifetime. A rigorous expression for the average lifetime against absorption, appropriate for a drift phase averaged radial diffusion equation, is derived assuming (1) a uniform distribution of gyrocenter equatorial plane crossing points in the sweeping corridor and (2) randomization of gyrophase. The pitch angle and energy dependences of the sweeping lifetime are found to be significantly different from the predictions of previous analytical estimates.
    Keywords: ASTRONOMY
    Type: Journal of Geophysical Research (ISSN 0148-0227); 90; 3428-343
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The Small Satellites of Pluto as Observed by New Horizons (2016)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The New Horizons mission has provided resolved measurements of Pluto's moons Styx, Nix, Kerberos, and Hydra. All four are small, with equivalent spherical diameters of approx.40 kilometers for Nix and Hydra and approx. 10 kilometers for Styx and Kerberos. They are also highly elongated, with maximum to minimum axis ratios of approx. 2. All four moons have high albedos (approx.50 to 90%) suggestive of a water-ice surface composition. Crater densities on Nix and Hydra imply surface ages of at least 4 billion years. The small moons rotate much faster than synchronous, with rotational poles clustered nearly orthogonal to the common pole directions of Pluto and Charon. These results reinforce the hypothesis that the small moons formed in the aftermath of a collision that produced the Pluto-Charon binary.
    Keywords: Astronomy; Lunar and Planetary Science and Exploration
    Type: GSFC-E-DAA-TN40469 , Science (ISSN 0036-8075) (e-ISSN 1095-9203); 351; 6279
    Format: text
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