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Article
Open AccessA Second-Order Closed-Form \(J_2\) Model for the Draper Semi-Analytical Satellite Theory
A second-order closed-form semi-analytical solution of the main problem of the artificial satellite theory ( \(J_2\) ...
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Article
Deprit’s Elimination of the Parallax Revisited
An extension of Deprit’s elimination of the parallax is proposed. This extension takes advantage of the flexibility of the Lie-Deprit method, when the inverse of the Lie operator is applied in order to calcula...
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Article
PPKBZ9 \(\mathcal{A}, \mathcal{S}\mathcal{A}\) Two Orbit Propagators Based on an Analytical Theory
In the context of general perturbation theories, we analyze the motion of an artificial satellite around an Earth-like planet perturbed by the first eight zonal harmonic coefficients. By means of two Lie trans...
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Article
Mortality and socioeconomic deprivation in census tracts of an urban setting in Southern Europe
In southern European cities, research on deprivation and mortality inequalities using small-area analysis is recent. In many countries, the census tract (CT) is the smallest territorial unit for which populati...