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arXiv 1005.2976gr-qcnlin.CD
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LISA轨道的自主摄动

Autonomous perturbations of LISA orbits

Giuseppe Pucacco, Massimo Bassan, Massimo Visco

摘要:

我们调查的LISA轨道上的自主扰动,即产生的影响,可以表示只有在希尔框架的位置,但不是时间的字段。这第一步的LISA轨道的研究一直是最近的论文的主题,实施分析技术的基础上“后周转”近似的希尔框架,以找到最佳的无扰轨道。自然的一步是分析对纯粹开普勒轨道的扰动。在目前的工作中,一个特别强调的是把地球的潮汐场假定为固定在希尔框架。一个准确的解释的全球结构的摄动解决方案揭示了可能的影响注入在轨道上时,任务的时间基线比以前的文件中假设的更长。其他相关的自主扰动类别是由太阳场的修正给出的,太阳场负责慢岁差和全球静止场,与行星际尘埃或局部暗物质成分等源有关。在这些领域的扩展中包含简单的线性贡献产生长期的解决方案,可以与测量进行比较,并可能用于评估扰动组件的一些形态学特性。

英文摘要:

We investigate autonomous perturbations on the orbits of LISA, namely the effects produced by fields that can be expressed only in terms of the position, but not of time in the Hill frame. This first step in the study of the LISA orbits has been the subject of recent papers which implement analytical techniques based on a "post-epicyclic" approximation in the Hill frame to find optimal unperturbed orbits. The natural step forward is to analyze the perturbations to purely Keplerian orbits. In the present work a particular emphasis is put on the tidal field of the Earth assumed to be stationary in the Hill frame. An accurate interpretation of the global structure of the perturbed solution sheds light on possible implications on injection in orbit when the time base-line of the mission is longer than that assumed in previous papers. Other relevant classes of autonomous perturbations are those given by the corrections to the Solar field responsible for a slow precession and a global stationary field, associated to sources like the interplanetary dust or a local dark matter component. The inclusion of simple linear contributions in the expansion of these fields produces secular solutions that can be compared with the measurements and possibly used to evaluate some morphological property of the perturbing components.

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