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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Low-altitude, near-polar and near-circular orbits around Europa

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Carvalho, J. P. S. [1, 2] ; Elipe, A. [3, 4] ; Vilhena de Moraes, R. [1, 2] ; Prado, A. F. B. A. [5]
Total Authors: 4
[1] Univ Estadual Paulista, UNESP, BR-12516410 Guaratingueta, SP - Brazil
[2] Univ Fed Sao Paulo, Inst Ciencia & Tecnol, UNIFESP, BR-12331280 Sao Jose Dos Campos, SP - Brazil
[3] Univ Zaragoza, IUMA, Ctr Univ Def Zaragoza, E-50009 Zaragoza - Spain
[4] Univ Zaragoza, IUMA, Grp Mecan Espacial, E-50009 Zaragoza - Spain
[5] INPE, Div Space Mech & Control, BR-12227010 Sao Jose Dos Campos, SP - Brazil
Total Affiliations: 5
Document type: Journal article
Source: Advances in Space Research; v. 49, n. 5, p. 994-1006, MAR 1 2012.
Web of Science Citations: 16

The dynamics of orbits around planetary satellites, taking into account the gravitational attraction of a third-body and the non -uniform distribution of mass of the planetary satellite, is studied. The Hamiltonian considered is explicitly time-dependent. Conditions for frozen orbits are presented. Low-altitude, near-polar orbits, very desirable for scientific missions to study planetary satellites such as the Jupiter's moon Europa, are analyzed. Lifetimes for these orbits are computed through the single and double averaged method. Comparison between the results obtained by the single and double averaged method is presented. The single-averaged model is more realistic, since it does not eliminate the term due to the equatorial ellipticity of the planetary satellite as done by the double-averaged problem. Considering the single-averaged method, we found unstable frozen orbits where the satellite does not impact with the surface of Europa for at least 200 days. We present an approach using the unaveraged disturbing potential to analyze the effects of these terms in the amplitude of the eccentricity. (C) 2011 COSPAR. Published by Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 06/04997-6 - Close approach problems in orbital dynamics
Grantee:Rodolpho Vilhena de Moraes
Support type: Research Projects - Thematic Grants