The Sun Asphericities: Astrophysical Relevance

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dc.creatorRozelot, J-P.
dc.creatorPireaux, S.
dc.creatorLefebvre, S.
dc.creatorCorbard, T.
dc.date2004-03-16
dc.date2004-04-01
dc.date.accessioned2026-07-07T02:12:38Z
dc.date.available2026-07-07T02:12:38Z
dc.descriptionOf all the fundamental parameters of the Sun (diameter, mass, temperature...), the gravitational multipole moments (of degree l and order m) that determine the solar moments of inertia, are still poorly known. However, at the first order (l=2), the quadrupole moment is relevant to many astrophysical applications. It indeed contributes to the relativistic perihelion advance of planets, together with the post-Newtonian (PN) parameters; or to the precession of the orbital plane about the Sun polar axis, the latter being unaffected by the purely relativistic PN contribution. Hence, a precise knowledge of the quadrupole moment is necessary for accurate orbit determination, and alternatively, to obtain constraints on the PN parameters. Moreover, the successive gravitational multipole moments have a physical meaning: they describe deviations from a purely spherical mass distribution. Thus, their precise determination gives indications on the solar internal structure. Here, we explain why it is difficult to compute these parameters, how to derive the best values, and how they will be determined in a near future by means of space experiments.
dc.description14 pages, 9 figures (see published version for a better resolution), submited to Proceedings of the Royal Society: Mathematical, Physical and Engineering Sciences
dc.identifierhttps://arxiv.org/abs/astro-ph/0403382
dc.identifierhttp://arxiv.org/abs/astro-ph/0403382
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/7522
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectSpace Physics
dc.titleThe Sun Asphericities: Astrophysical Relevance
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