Mascon gravitation model using a shaped polyhedral source
| Autor: | Valerio Carruba, Safwan Aljbaae, T. G. G. Chanut |
|---|---|
| Přispěvatelé: | Universidade Estadual Paulista (Unesp), FEG/UNESP, Systèmes de Référence Temps Espace (SYRTE), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Instituto Nacional de Pesquisas Espaciais (INPE), Ministério da Ciência, Tecnologia e Inovação |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Physics
numerical [Methods] 010504 meteorology & atmospheric sciences general [Minor planets asteroids] Astronomy and Astrophysics 01 natural sciences Celestial mechanics [PHYS.PHYS.PHYS-SPACE-PH]Physics [physics]/Physics [physics]/Space Physics [physics.space-ph] Celestialmechanics Gravitation Classical mechanics Space and Planetary Science Asteroid 0103 physical sciences [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] 010303 astronomy & astrophysics ComputingMilieux_MISCELLANEOUS 0105 earth and related environmental sciences |
| Zdroj: | Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP Monthly Notices of the Royal Astronomical Society Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2015, 450 (4), pp.3742-3749. ⟨10.1093/mnras/stv845⟩ |
| ISSN: | 0035-8711 1365-2966 |
| DOI: | 10.1093/mnras/stv845⟩ |
| Popis: | Made available in DSpace on 2018-12-11T17:25:26Z (GMT). No. of bitstreams: 0 Previous issue date: 2015-01-01 In the last two decades, new computational tools have been developed in order to aid space missions to orbit around irregular small bodies. One of the techniques consists in rebuilding their shape in tetrahedral polyhedron. This method is well suited to determine the shape and estimate certain physical features of asteroids. However, a large computational effort is necessary depending on the quantity of triangular faces chosen. Another method is based on a representation of the central body in terms of mascons (discrete spherical masses). The main advantage of the method is its simplicity which makes the calculation faster. Nevertheless, the errors are non-negligible when the attraction expressions are calculated near the surface of the body. In this work, we carry out a study to develop a new code that determines the centre of mass of each tetrahedron of a shaped polyhedral source and evaluates the gravitational potential function and its first-and second-order derivatives. We performed a series of tests and compared the results with the classical polyhedron method. We found good agreement between our determination of the attraction expressions close to the surface, and the same determination by the classical polyhedron method. However, this agreement does not occur inside the body. Our model appears to be more accurate in representing the potential very close to the body's surface when we divide the tetrahedron in three parts. Finally, we have found that in terms of CPU time requirements, the execution of our code is much faster compared with the polyhedron method. Univ. Estadual Paulista-UNESP, Grupo de Dinâmica Orbital and Planetologia Univ. Estadual Paulista-UNESP, Grupo de Dinâmica Orbital and Planetologia |
| Databáze: | OpenAIRE |
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