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We present a comparison of the diurnal and subdiurnal nutations of the three last theories of rigid Earth nutation: SMART97, RDAN97 and REN 2000. For a better interpretation of the observations, we characterize their contribution to the polar mo[...]texto impreso
We present here the new tables REN-2000 of the nutation for a rigid Earth model, starting from Hamiltonian theory, with a level of truncature at 0.1 mu as for individual coefficients instead of 5 mu as (Kinoshita & Souchay 1990). For this presen[...]texto impreso
We present a comparison of the diurnal and subdiurnal terms of the three last theories of rigid Earth's rotation: SMART97, RDAN97 and REN 2000. For a better interpretation of the observations, we characterize their contribution to the polar moti[...]texto impreso
We present a study of the Earth's rotational motion in terms of the Earth Orientation Parameters (EOP) of the new paradigm that is recommended by the IAU 2000 resolutions to transform between the celestial and terrestrial reference systems. This[...]texto impreso
In this paper we discuss the influence of the triaxiality of a celestial body on its free rotation, i.e. in absence of any external gravitational perturbation. We compare the results obtained through two different analytical formalisms, one esta[...]texto impreso
In this paper, we make a study about the influence of the coefficients of the geopotential C-4,C- m and S-4,S- m, (m = 1, 2, 3, 4) on the nutation, starting from the Hamiltonian theory as developed by Kinoshita (1977). We obtain ten coefficients[...]texto impreso
In this paper, we calculate the coefficients of the nutation for a rigid Earth model due to the C-3m and S-3m (m not equal 0) harmonics of the geopotential, starting from the Hamiltonian theory as developped by Kinoshita (1977). We show that the[...]texto impreso
The purpose of this paper is to show how to solve in Hamiltonian formalism the equations of the polar motion of any arbitrarily shaped elastic celestial body, i.e. the motion of its rotation axis ( or angular momentum) with respect to its figure[...]texto impreso
The fields of Astrodynamics and Space Geodesy research are experiencing continuous growth. Advancements in science and technology are enabling missions with much more challenging goals. In response, many new techniques have been introduced to so[...]texto impreso
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Context. The close approach of the asteroid (99942) Apophis to Earth on April 13, 2029, at a distance of about 38 330 km, is naturally considered a dramatic and fascinating event by the astronomical community, as well as by the public. Aims. A[...]texto impreso
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In this paper, the expressions of variations of the dynamical ellipticity and the principal moments of inertia due to the deformations produced by the zonal part of the tidal potential are obtained. Starting from these expressions, we have studi[...]
