First MESSENGER orbital observations of Mercury's librations
First MESSENGER orbital observations of Mercury's librations
复制标题
第一个信使号轨道观测水星的振动
DOI:
10.1002/2015gl065152
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发表时间:
2015
影响因子:
5.2
通讯作者:
Solomon
中科院分区:
文献类型:
--
作者:
Oberst;Preusker;Margot;Phillips;. . . ;Solomon
We have coregistered laser altimeter profiles from 3 years of MErcury Surface, Space ENvironment,GEochemistry, and Ranging (MESSENGER) orbital observations with stereo digital terrain models to infer the rotation parameters for the planet Mercury. In particular, we provide the first observations of Mercury's librations from orbit. We have also confirmed available estimates for the orientation of the spin axis and the mean rotation rate of the planet. We find a large libration amplitude of 38.9 ± 1.3 arc sec and an obliquity of the spin axis of 2.029 ± 0.085 arc min, results confirming that Mercury possesses a liquid outer core. The mean rotation rate is observed to be (6.13851804 ± 9.4 × 10−7)°/d (a spin period of 58.6460768 days ± 0.78 s), significantly higher than the expected resonant rotation rate. As a possible explanation we suggest that Mercury is undergoing long‐period librational motion, related to planetary perturbations of its orbit.
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DOI:
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发表时间:
2013
期刊:
影响因子:
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作者:
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DOI:
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2011
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期刊:
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2010
期刊:
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通讯作者:
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DOI:
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发表时间:
2007
期刊:
影响因子:
--
作者:
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