利用MESSENGER放射科学数据改进行星星历和检验广义相对论
Use of MESSENGER radioscience data to improve planetary ephemeris and to test general relativity
摘要：
目前对水星轨道的了解主要来自于60年代至1998年的直接雷达测距，以及水手10号在70年代进行的五次水星飞越，以及2008年和2009年的信使号。2011年3月18日，信使号成为第一艘环绕水星的宇宙飞船。在信使号的轨道阶段获得的放射科学观测大大提高了我们对水星轨道的认识。利用GINS定轨软件对一年半的跟踪数据进行拟合，得到了精确的MESSENGER轨道。从全球导航定位系统获得的地球-水星几何位置的系统误差，也称为距离偏差，然后用于拟合INPOP的行星运动动力学模型。一个改进的星历表，然后获得，INPOP 13 a，并用于执行广义相对论测试的PPN形式。我们对PPN参数（beta和gamma？）比以前的结果更严格。
英文摘要：
The current knowledge of Mercury orbit has mainly been gained by direct radar ranging obtained from the 60s to 1998 and by five Mercury flybys made by Mariner 10 in the 70s, and MESSENGER made in 2008 and 2009. On March 18, 2011, MESSENGER became the first spacecraft to orbit Mercury. The radioscience observations acquired during the orbital phase of MESSENGER drastically improved our knowledge of the orbit of Mercury. An accurate MESSENGER orbit is obtained by fitting one-and-half years of tracking data using GINS orbit determination software. The systematic error in the Earth-Mercury geometric positions, also called range bias, obtained from GINS are then used to fit the INPOP dynamical modeling of the planet motions. An improved ephemeris of the planets is then obtained, INPOP13a, and used to perform general relativity tests of PPN-formalism. Our estimations of PPN parameters (beta and gamma?) are more stringent than previous results.
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