首页> 外文会议>Third Meeting on Celestical Mechanics - CELMEC III Jun 18-22, 2001 Rome, Italy >INTER-COMPARISONS BETWEEN NUMERICAL INTEGRATIONS AND ANALYTICAL THEORY FOR THE SOLAR SYSTEM
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INTER-COMPARISONS BETWEEN NUMERICAL INTEGRATIONS AND ANALYTICAL THEORY FOR THE SOLAR SYSTEM

机译:太阳系数值积分与分析理论之间的比较

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We have implemented four different numerical integration methods that we have compared each together both in the simple 2-body problem in order to test the CPU time performance versus the precision required, and in the 9-body problem of the solar planetary system. In that last case the agreement between our numerical integration methods is at the level of a few 10~(-10) AU for the semi-major axis and of few 10~(-12) for the eccentricity for a 1 000 years time span. Moreover, we have also compared our results with the semi-analytical VSOP87 ephemerides and the JPL's DE406 numerical ephemerides. In that case the differences for the semi-major axis and the eccentrity of the Earth-Moon barycenter are at the level of 10~(-8). Some clear peaks appear in the residuals, which suggest that our modelisation of the 9-body problem should be improved. In particular we do not have taken account of relativistic effects. In a near future, we schedule to introduce asteroids in our computations in order to evaluate their influence in the planetary motions.
机译:我们已经实现了四种不同的数值积分方法,分别在简单的2体问题中进行了比较,以便测试CPU时间性能与所需精度之间的关系,并在太阳行星系统的9体问题中进行了比较。在那最后一种情况下,我们的数值积分方法之间的一致性在半长轴上大约为10〜(-10)AU,而在1000年的时间跨度内则为偏心率在10〜(-12)左右。 。此外,我们还将结果与半解析VSOP87星历表和JPL的DE406数值星历表进行了比较。在这种情况下,半长轴和地月重心偏心的差异在10〜(-8)的水平。在残差中出现一些清晰的峰,这表明我们对9体问题的建模应加以改进。特别是,我们没有考虑相对论的影响。在不久的将来,我们计划在我们的计算中引入小行星,以评估它们在行星运动中的影响。

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