土卫九的轨道从地面和空间的观测
Phoebe's orbit from ground-based and space-based observations
摘要：
土卫九是土星的第九颗卫星，它的星历表并不十分精确。以前的动力学模型通常过于简化，天体测量是异构的，土星的星历本身是一个额外的误差源。其目的是通过使用大量的观测数据、修正某些系统误差和更新动力学模型来改进菲比的星历。动力学模型利用了行星和土星卫星的最新星历表。通过使用地面和空间观测的汇编，并通过校正用于还原的恒星目录中的偏差，改进了菲比的天体测量。我们提出了一个精确的星历的菲比与残差为0.45角秒和估计的精度小于100公里的菲比的位置在1990年至2020年期间。
英文摘要：
The ephemeris of Phoebe, the ninth satellite of Saturn, is not very accurate. Previous dynamical models were usually too simplified, the astrometry is heterogeneous and, the Saturn's ephemeris itself is an additionnal source of error. The aim is to improve Phoebe's ephemeris by using a large set of observations, correcting some systematic errors and updating the dynamical model. The dynamical model makes use of the most recent ephemeris of planets and Saturnian satellites. The astrometry of Phoebe is improved by using a compilation of ground-based and space-based observations and by correcting the bias in stellar catalogues used for the reduction. We present an accurate ephemeris of Phoebe with residuals of 0.45 arcsec and with an estimated accuracy of Phoebe's position of less that 100 km on 1990-2020 period.
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