期刊
NATURE COMMUNICATIONS
卷 9, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-017-02558-1
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The NASA MESSENGER mission explored the innermost planet of the solar system and obtained a rich data set of range measurements for the determination of Mercury's ephemeris. Here we use these precise data collected over 7 years to estimate parameters related to general relativity and the evolution of the Sun. These results confirm the validity of the strong equivalence principle with a significantly refined uncertainty of the Nordtvedt parameter eta = (-6.6 +/- 7.2) x 10(-5). By assuming a metric theory of gravitation, we retrieved the post- Newtonian parameter beta = 1 + (-1.6 +/- 1.8) x 10(-5) and the Sun's gravitational oblateness, J(2 circle dot) = (2.246 +/- 0.022) x 10(-7). Finally, we obtain an estimate of the time variation of the Sun gravitational parameter, GM(circle dot)/GM(circle dot) = (- 6.13 +/- 1.47) x 10(-14), which is consistent with the expected solar mass loss due to the solar wind and interior processes. This measurement allows us to constrain vertical bar(D)over dot vertical bar/G to be <4 x 10(-14) per year.
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