Asteroids
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. O sistema triplo de asteróides 2001 SN263: dinâmica orbital e estabilidade / The triple system of asteroids 2001 SN263: orbital dynamics and stability.
O corpo celeste 2001 SN263 é um NEA (Near-Earth Asteroid) com semi-eixo maior de 1,99 UA, excentricidade de 0,48 e inclinação orbital 6,7 graus. Curvas de Luz obtidas no Observatório de Haute-Provence, em Janeiro de 2008, levaram à conclusão de que este asteróide se tratava de um sistema binário. Em fevereiro de 2008 o sistema foi observado ao longo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/11/2011
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2. Orbital evolution and maneuvers around non-spherical bodies / Evolução orbital e manobras em torno de corpos não-esféricos
In the last years several asteroids had their shapes identified using images from space probes or through the indirect radar data determination. In a general way, these asteroids have forms quite different from spherical. Conventional spherical harmonic representations of the gravitational potential of such bodies require expansions of high degree and order,
Publicado em: 2006
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3. Possibility of collision between co-orbital asteroids and the Earth
Considering hypothetical co-orbital asteroids with the Earth, Tatum (1997) presented a study about the necessary radial distance in order to produce collision. He adopted an analysis considering a composition of circular two-body systems, Sun-Earth and Sun-Asteroid. He found that asteroids with radial positions between 0.9943 and 1.0057 AU would necessarily
Computational & Applied Mathematics. Publicado em: 2005-04
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4. Origem e Evolução Dinâmica de Algumas Populações de Pequenos Corpos Ressonantes no Sistema Solar / Dynamical evolution and origin of some populations of small Solar System resonant bodies
Nesta tese estudamos algumas regiões de aparente estabilidade no cinturão de asteróides e no cinturão de Kuiper, analisando a evoluçãao dinâmica dos objetos nessas regiões por intervalos de tempo muito longos, em geral, da ordem da idade do Sistema Solar. Centramos principalmente nossa atenção no estudo das populações de pequenos corpos ressonant
Publicado em: 2001
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5. Mapeamentos Simpléticos em Dinâmica Asteroidal / Symplectic mappings in asteroidal dynamics
In this work, we developed a symplectic mapping which allow us to study the dynamical behaviour of asteroidal resonances in the frame of the non-planar elliptic restricted three-body problem. To obtain such a mapping we combine a symplectic scheme similar to that of Hadjidemetriou (1986) together with an asymmetric expansion of the disturbing funtion (Ferraz
Publicado em: 1997
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6. Chaos and stability of the solar system
Over the last two decades, there has come about a recognition that chaotic dynamics is pervasive in the solar system. We now understand that the orbits of small members of the solar system—asteroids, comets, and interplanetary dust—are chaotic and undergo large changes on geological time scales. Are the major planets' orbits also chaotic? The answer is n
The National Academy of Sciences.
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7. Space weathering on airless planetary bodies: Clues from the lunar mineral hapkeite
Physical and chemical reactions occurring as a result of the high-velocity impacts of meteorites and micrometeorites and of cosmic rays and solar-wind particles are major causes of space weathering on airless planetary bodies, such as the Moon, Mercury, and asteroids. These weathering processes are responsible for the formation of their regolith and soil. We
National Academy of Sciences.
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8. Identification of diamino acids in the Murchison meteorite
Amino acids identified in the Murchison chondritic meteorite by molecular and isotopic analysis are thought to have been delivered to the early Earth by asteroids, comets, and interplanetary dust particles where they may have triggered the appearance of life by assisting in the synthesis of proteins via prebiotic polycondensation reactions [Oró, J. (1961) N
National Academy of Sciences.