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首页> 外文期刊>Journal of geophysical research. Planets >The gravity field, orientation, and ephemeris of Mercury from MESSENGER observations after three years in orbit
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The gravity field, orientation, and ephemeris of Mercury from MESSENGER observations after three years in orbit

机译：MESSENGER在轨道运行三年后的重力场，水星方向和星历

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摘要

We have analyzed 3 years of radio tracking data from the MESSENGER spacecraft in orbit around Mercury and determined the gravity field, planetary orientation, and ephemeris of the innermost planet. With improvements in spatial coverage, force modeling, and data weighting, we refined an earlier global gravity field both in quality and resolution, and we present here a spherical harmonic solution to degree and order 50. In this field, termed HgM005, uncertainties in low-degree coefficients are reduced by an order of magnitude relative to earlier global fields, and we obtained a preliminary value of the tidal Love number k2 of 0.451±0.014.We also estimated Mercury's pole position, and we obtained an obliquity value of 2.06±0.16 arcmin, in good agreement with analysis of Earth-based radar observations. From our updated rotation period (58.646146 ± 0.000011 days) and Mercury ephemeris, we verified experimentally the planet's 3: 2 spin-orbit resonance to greater accuracy than previously possible. We present a detailed analysis of the HgM005 covariance matrix, and we describe some near-circular frozen orbits around Mercury that could be advantageous for future exploration.
机译：我们分析了来自MESSENGER航天器在水星周围轨道上的3年无线电跟踪数据，并确定了最内层行星的重力场，行星方向和星历。随着空间覆盖率，力建模和数据权重的改进，我们在质量和分辨率上改进了较早的全局重力场，并且在此提出了度数和阶数为50的球谐解决方案。在该场中，称为HgM005，其低不确定性阶系数相对于早期的整体场减小了一个数量级，我们得到的潮汐洛夫数k2的初始值为0.451±0.014。我们还估计了水星的极点位置，而倾角值为2.06±0.16 arcmin，与对地基雷达观测的分析非常吻合。通过更新后的自转周期（58.646146±0.000011天）和水星星历，我们以实验方式验证了行星的3：2自旋轨道共振，其精度比以前更高。我们介绍了HgM005协方差矩阵的详细分析，并描述了一些围绕水星的近圆形冻结轨道，这些轨道可能对将来的勘探有利。

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