Abstract Due to its oblateness, the Sun carries a solar quadrupole moment playing a key role at the crossroad of fundamental solar physics, astrometry and celestial mechanics. There is nowadays a general agreement on its order of magnitude ( 2 × 10 - 7 ), but its temporal dependence is still poorly known. Helioseismology led to a variation within the solar cycle by less than 0.04%, not yet confirmed by other means. Analysis of the perihelion precession of planetary orbits computed in the solar equatorial coordinate system, instead of the ecliptic coordinate system usually used, shows that a periodic variation of the J 2 term rather than of a simple constant, must be considered. Gravity tests within the Planetary and Lunar Ephemerides provide a fruitful independent approach. Confronting results from three sets of Ephemerides computed at different periods of time, a variability dependence within the solar cycle can be evidenced. If this outcome is not fortuitous, such a finding suggests a quadratic fit, that can be explained through the variation of the rotation law with latitude and time.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Exploring the temporal variation of the solar quadrupole moment from relativistic gravitation contributions: A fortuitous circumstance?


    Contributors:
    Rozelot, J.P. (author) / Eren, S. (author)

    Published in:

    Advances in Space Research ; 65 , 12 ; 2821-2827


    Publication date :

    2019-10-31


    Size :

    7 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    CIRCUMSTANCE RECOGNITION DEVICE

    HOTTA MIYAKO / DOI KOJI / TAKEMURA MASAYUKI | European Patent Office | 2017

    Free access

    Pump and circumstance

    The Pump Guy | Online Contents | 2004


    SURROUNDING CIRCUMSTANCE MONITORING APPARATUS

    KATAOKA YUSUKE | European Patent Office | 2020

    Free access

    Clocks and spaceborne tests of relativistic gravitation

    Vessot, Robert F.C. | Elsevier | 1989


    Surrounding circumstance monitoring apparatus

    KATAOKA YUSUKE | European Patent Office | 2020

    Free access