LETSGO：一项基于航天器的任务，通过框架拖曳精确测量太阳angular momentum
LETSGO: A spacecraft-based mission to accurately measure the solar angular momentum with frame-dragging
摘要：
LETSGO（LEnse-Thirring Sun-Geo Orbiter）是一项拟议的天基飞行任务，涉及使用一个沿垂直于黄道的高度偏心的日心轨道运行的航天器。其目的是通过持续监测地球探测器的范围，精确测量太阳的一些重要物理性质，并测试太阳引力场的一些后牛顿特征。初步的灵敏度分析表明，假设对航天器的测距精度为厘米级，原则上可以在2年的时间尺度内检测到10^-3-10^-4级的兰斯-瑟林效应，而太阳引力场中较大的史瓦西分量可以以大约10^-8-10^的相对精度被感测到。9在同一时间段内。由于太阳的非球形而引起的相互竞争的距离扰动将是系统误差的一个来源，但事实证明，所研究的所有三种运动动力学特征都以不同的方式影响地球探测器的距离，从而可以在数据分析中进行分离。高离心率将有助于减少非引力摄动的影响，当LETSGO以几个太阳半径接近太阳时，其影响肯定会很严重。进一步的研究应致力于通过广泛的数值数据模拟、参数估计和协方差分析来调查非保守力的后果和感兴趣的效应的实际可测量性。另一种替代方案，飞越配置是值得考虑的。
英文摘要：
LETSGO (LEnse-Thirring Sun-Geo Orbiter) is a proposed space-based mission involving the use of a spacecraft moving along a highly eccentric heliocentric orbit perpendicular to the ecliptic. It aims to accurately measure some important physical properties of the Sun and to test some post-Newtonian features of its gravitational field by continuously monitoring the Earth-probe range. Preliminary sensitivity analyses show that, by assuming a cm-level accuracy in ranging to the spacecraft, it would be possible to detect, in principle, the Lense-Thirring effect on it at a 10^-3-10^-4 level over a timescale of 2 yr, while the larger Schwarzschild component of the solar gravitational field may be sensed with a relative accuracy of about 10^-8-10^-9 during the same temporal interval. The competing range perturbation due to the non-sphericity of the Sun would be a source of systematic error, but it turns out that all the three dynamical features of motion examined affect the Earth-probe range in different ways, allowing for a separation in data analyses. The high eccentricity would help in reducing the impact of the non-gravitational perturbations whose impact would certainly be severe when LETSGO would approach the Sun at just a few solar radii. Further studies should be devoted to investigate both the consequences of the non-conservative forces and the actual measurability of the effects of interest by means of extensive numerical data simulations, parameter estimations and covariance analyses. Also an alternative, fly-by configuration is worth of consideration.
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