Rotational Parameters and Reference System of Mercury from MESSENGER Laser Altimetry and Stereo Topographic Models

我们建议确定或改善旋转和参考系参数的行星水星，使用立体图像和激光高度计数据获得的信使号航天器，目前在轨道上这个最里面的太阳系行星。旋转参数（包括旋转轴在空间中的取向、平均旋转速率和旋转速率的轻微振荡，即，将利用数据相关技术，将大量现有的激光高度计剖面与大面积静态立体地形模型精确匹配，从而确定地球自转和地球振动（地球自转和地球振动）。两个数据集之间的静态偏移和趋势也将被确定，并使我们能够正确地将立体模型地形与行星参考系联系起来。利用改进的旋转模型，将得到一个精确的行星几何图像地图，这将是规划未来水星飞行任务的一个重要工具。旋转模型揭示了水星的内部结构和液核特征。在新导出的自转模型的基础上，将严格讨论行星的内部及其热演化。

We propose to determine or improve rotational and reference system parameters of the planet Mercury, using stereo image and laser altimeter data obtained by the MESSENGER spacecraft, currently in orbit about this innermost Solar System planet. The rotational parameters (including the orientation of the rotational axis in space, the average spin rate, and slight oscillations in spin rate, i.e., librations) will be determined from precisely matching the large numbers of available laser altimeter profiles with large-area static stereo topographic models using data correlation techniques. Static offsets and trends between the two data sets will also be determined and enable us to correctly tie the stereo models topography to the planetary reference frame. Using the improved rotational model, a geometrically precise image map of the planet will be derived, which will be an important tool for planning future missions to Mercury. Rotational models bare on Mercurys interior structure and the characteristics of its liquid core. On the basis of the new derived rotational model, the interior of the planet and its thermal evolution will be critically discussed.