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arXiv 1107.3445gr-qcastro-ph.EPphysics.space-ph
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先驱者异常随时间变化分量的轨道效应

Orbital effects of the time-dependent component of the Pioneer anomaly

Lorenzo Iorio

摘要:

我们工作的影响,最近确定的时间依赖的组成部分的先锋异常(PA),解释为一个额外的外来加速度的引力起源相对于众所周知的PA一样的常数,可能对太阳系的一些行星的轨道运动。假设它指向太阳,结果是测试粒子轨道的半长轴a和偏心率e都经历长期变化。对于土星和天王星,现代数据记录至少覆盖了一个完整的轨道旋转,这种预测的异常比目前的经验确定其轨道参数的精度大2-3个数量级,这些轨道参数来自通常的轨道确定程序,其中PA没有建模。考虑到这种假设特征的预测的巨大尺寸,它们在目前可用的处理数据中的缺失不太可能归因于它们在估计参数中的“吸收”,这是由它们没有被明确建模的事实引起的。根据土星近日点岁差的最新观测结果,在9.5天文单位处的恒定PA型加速度的大小不可能大于9 10^-15 m s^-2。

英文摘要:

We work out the impact that the recently determined time-dependent component of the Pioneer Anomaly (PA), interpreted as an additional exotic acceleration of gravitational origin with respect to the well known PA-like constant one, may have on the orbital motions of some planets of the solar system. By assuming that it points towards the Sun, it turns out that both the semi-major axis a and the eccentricity e of the orbit of a test particle experience secular variations. For Saturn and Uranus, for which modern data records cover at least one full orbital revolution, such predicted anomalies are up to 2-3 orders of magnitude larger than the present-day accuracies in empirical determinations their orbital parameters from the usual orbit determination procedures in which the PA was not modeled. Given the predicted huge sizes of such hypothetical signatures, it is unlikely that their absence from the presently available processed data can be attributable to an "absorption" for them in the estimated parameters caused by the fact that they were not explicitly modeled. The magnitude of a constant PA-type acceleration at 9.5 au cannot be larger than 9 10^-15 m s^-2 according to the latest observational results for the perihelion precession of Saturn.

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