arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1302.6920gr-qcastro-ph.EPphysics.space-ph
收藏

朱诺号对广义相对论的一个可能的新检验

A possible new test of general relativity with Juno

L. Iorio

摘要:

旋转物体引力势的多极展开影响了绕其运行的试验粒子的轨道运动,该轨道运动具有经典和相对论水平的长期扰动。在这个初步的灵敏度分析中,我们首次表明,由于木星的高偏心率(e=0.947)和巨大的扁率(J2=1.47 10^-2),正在进行的朱诺号任务在木星的引力场中进行为期一年的科学研究阶段(2016年11月10日至2017年10月5日),可以测量J2 c^-2效应。在1-2年的时间里,朱诺星的半长轴a和近木星ω将分别移动Δa =700-900米和Δω= 50-60毫角秒。数值分析还表明,在朱诺号最接近地球的典型6小时飞行中,J2 c ^-2距离变化率信号的预期值应该达到每秒280微米。先前由其他研究人员进行的关于透镜-瑟林效应的可测量性的独立分析表明,朱诺号的无线电科学设备在这样的通过中应该达到每秒1-5微米的多普勒距离速率测量精度。经典偶纬向扰动的距离变化率特征不同于1 PN扰动。因此,基于模拟多普勒数据的协方差分析和专用参数估计的进一步调查值得进一步考虑。结果表明,J2 c^-2效应不能解释地球引力场的飞越异常。在6678 km × 57103 km极轨道上的专用航天器将经历0.4 mm s^-1的地心J2 c^-2距离变化率。

英文摘要:

The expansion in multipoles of the gravitational potential of a rotating body affects the orbital motion of a test particle orbiting it with long-term perturbations both at a classical and at a relativistic level. In this preliminary sensitivity analysis, we show that, for the first time, the J2 c^-2 effects could be measured by the ongoing Juno mission in the gravitational field of Jupiter during its yearlong science phase (10 November 2016-5 October 2017) thanks to its high eccentricity (e=0.947) and to the huge oblateness of Jupiter (J2=1.47 10^-2). The semi-major axis a and the perijove ω of Juno are expected to be shifted by Δa =700-900 m and Δω= 50-60 milliarcseconds, respectively, over 1-2 yr. A numerical analysis shows also that the expected J2c^-2 range-rate signal for Juno should be as large as 280 microns per second during a typical 6 h pass at its closest approach. Independent analyses previously performed by other researchers about the measurability of the Lense-Thirring effect showed that the radio science apparatus of Juno should reach an accuracy in Doppler range-rate measurements of 1-5 microns per second over such passes. The range-rate signature of the classical even zonal perturbations is different from the 1PN one. Thus, further investigations, based on covariance analyses of simulated Doppler data and dedicated parameters estimation, are worth of further consideration. It turns out that the J2 c^-2 effects cannot be responsible of the flyby anomaly in the gravitational field of the Earth. A dedicated spacecraft in a 6678 km X 57103 km polar orbit would experience a geocentric J2 c^-2 range-rate shift of 0.4 mm s^-1.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑