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arXiv 1008.0799astro-ph.EP
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太阳系数值模拟的长期相对论模型

A Secular Relativistic Model For Solar System's Numerical Simulations

T. Gallardo, J. Venturini

摘要:

利用高斯平均方程,计算了太阳对近日点幅角和轨道平均距平的长期相对论效应。然后,我们测试不同的替代更简单的模型,已提出重现长期相对论效应的轨道要素。一般来说,模型引入了与速度无关但取决于日心距离的人为扰动。如果这些扰动被设置为恒定时间步长积分器中的脉冲,当粒子接近近日点时,所产生的脉冲可能非常强并且采样不好,从而产生虚假的轨道演化。为了克服这一挫折,我们提出了两个新的模型的基础上一个常数,距离无关,扰动。利用这些模型,我们得到了正确的近日点辐角的长期漂移,并再现了预期的长期轨道演化。我们还详细讨论了不同模式对平均距平的长期影响。

英文摘要:

Using Gauss' averaged equations, we compute the secular relativistic effects generated by the Sun on the argument of the perihelion and the mean anomaly of an orbit. Then we test different alternative simpler models that have been proposed to reproduce the secular relativistic effects in the orbital elements. Generally, models introduce artificial perturbations that are velocity-independent but that depend on the heliocentric distance. If these perturbations are set as an impulse in a constant timestep integrator, when the particle approaches perihelion the generated impulse could be very strong and badly sampled, originating a spurious orbital evolution. In order to overcome this setback, we propose two new models based on a constant, distance-independent, perturbation. With these models we obtain the correct secular drift in the argument of perihelion and the expected secular orbital evolution is reproduced. We also discuss with some detail the secular effect generated on the mean anomaly by different models.

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