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- J. L. Margot
- Department of Astronomy, Cornell University, 304 Space Sciences Building, Ithaca, NY 14853, USA.
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- S. J. Peale
- Department of Astronomy, Cornell University, 304 Space Sciences Building, Ithaca, NY 14853, USA.
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- R. F. Jurgens
- Department of Astronomy, Cornell University, 304 Space Sciences Building, Ithaca, NY 14853, USA.
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- M. A. Slade
- Department of Astronomy, Cornell University, 304 Space Sciences Building, Ithaca, NY 14853, USA.
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- I. V. Holin
- Department of Astronomy, Cornell University, 304 Space Sciences Building, Ithaca, NY 14853, USA.
書誌事項
- 公開日
- 2007-05-04
- DOI
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- 10.1126/science.1140514
- 公開者
- American Association for the Advancement of Science (AAAS)
この論文をさがす
説明
<jats:p> Observations of radar speckle patterns tied to the rotation of Mercury establish that the planet occupies a Cassini state with obliquity of 2.11 ± 0.1 arc minutes. The measurements show that the planet exhibits librations in longitude that are forced at the 88-day orbital period, as predicted by theory. The large amplitude of the oscillations, 35.8 ± 2 arc seconds, together with the Mariner 10 determination of the gravitational harmonic coefficient <jats:italic>C</jats:italic> <jats:sub>22</jats:sub> , indicates that the mantle of Mercury is decoupled from a core that is at least partially molten. </jats:p>
収録刊行物
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- Science
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Science 316 (5825), 710-714, 2007-05-04
American Association for the Advancement of Science (AAAS)
