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A modified Hermite integrator for planetary dynamics

机译:改进的Hermite积分器,用于行星动力学

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摘要

We describe a modified time-symmetric Hermite integrator specialized for the long-term integration of planetary orbits. Our time-symmetric integrators have no secular errors in the semi-major axis and the eccentricity for the integration of two-body Kepler problems as usual time-symmetric and symplectic integrators. The usual time-symmetric or symplectic integrators, however, show a secular drift in the argument of pericenter. Our new family of integrators has one free parameter, which we can adjust to reduce the error in the argument of pericenter without breaking the time-symmetry or changing the order of the integrator. We show analytically that the leading term of the error vanishes for a unique value of the parameter, which is independent of the size of the timestep and the eccentricity. It is also possible to eliminate the non-leading, higher-order terms by using a parameter value that depends on both the size of the timestep and the eccentricity. We describe the second- and the fourth-order schemes. An extension to higher order is straightforward.
机译:我们描述了一种改进的时间对称Hermite积分器,专门用于行星轨道的长期积分。我们的时间对称积分器在半长轴上没有世俗的错误,并且像通常的时间对称积分和辛积分器一样,对两体开普勒问题的积分没有偏心率。然而,通常的时间对称或辛积分器在围绕中心点的论证中显示出长期的漂移。我们的新积分器系列具有一个自由参数,我们可以对其进行调整以减小中心点自变量中的误差,而不会破坏时间对称性或更改积分器的阶数。我们通过分析表明,对于参数的唯一值,误差的前导项消失了,该值与时间步长和偏心率无关。通过使用取决于时间步长和偏心率的参数值,还可以消除无前导的高阶项。我们描述了二阶和四阶方案。扩展到更高阶很简单。

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