RSS 1.0Departamento de Matemática
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Identification and dynamical properties of asteroid families
; ; Carruba, Valerio
(Asteroids IV, 2015) [Capítulo de livro]
Asteroids formed in a dynamically quiescent disk but their orbits became gravitationally stirred enough by Jupiter to lead to high-speed collisions. As a result, many dozen large asteroids have been disrupted by impacts ... -
The fate of particles in the dynamical environment around Kuiper-Belt object (486958) Arrokoth
; Winter, O. C. (Astrophysics and Space Science, 2022) [Artigo]
The contact binary Kuiper-Belt object (486958) Arrokoth, targeted by the New Horizons mission, has a unique slope pattern, which is a result of its irregular bilobate surface shape and high spin period. Thus, some peculiar ... -
Analysis of physical phenomena associated with asteroid deect by kinetic impact
Chagas, Bruno; De A. Prado, Antonio F.B. ; Winter, Othon Cabo (Proceedings of the International Astronautical Congress, IAC, 2021) [Trabalho apresentado em evento]
We have as objective for the present work, to study the use of a kinetic impact technique as a way to deect asteroids that may present some risk of collision with the Earth at a certain moment, or even the interest in ... -
APOPHIS - Effects of the 2029 Earth's encounter on the surface and nearby dynamics
Valvano, G.; Winter, O. C. ; Sfair, R. ; MacHado Oliveira, R. ; ; Moura, T. S. (Monthly Notices of the Royal Astronomical Society, 2022) [Artigo]
The 99942 Apophis close encounter with Earth in 2029 may provide information about asteroid's physical characteristics and measurements of Earth's effects on the asteroid surface. In this work, we analysed the surface and ... -
The main perturbing objects on the orbits of (616) Prometheus and (617) Pandora
Gomes-Júnior, A. R.; Santana, T. ; Winter, O. C. ; Sfair, R. (Monthly Notices of the Royal Astronomical Society, 2022) [Artigo]
The dynamical evolution of the Prometheus and Pandora pair of satellites is chaotic, with a short 3.3 yr Lyapunov time. It is known that the anti-alignment of the apses line of Prometheus and Pandora, which occurs every ... -
Dynamics around non-spherical symmetric bodies - I. the case of a spherical body with mass anomaly
Madeira, G.; Giuliatti Winter, S. M. ; Ribeiro, T. ; Winter, O. C. (Monthly Notices of the Royal Astronomical Society, 2022) [Artigo]
The space missions designed to visit small bodies of the Solar system boosted the study of the dynamics around non-spherical bodies. In this vein, we study the dynamics around a class of objects classified by us as ... -
On the stability of additional moons orbiting Kepler-1625 b
Moraes, R. A.; ; Winter, O. C. ; Monteiro, J. (Monthly Notices of the Royal Astronomical Society, 2022) [Artigo]
Since it was proposed, the exomoon candidate Kepler-1625 b-I has changed the way we see satellite systems. Because of its unusual physical characteristics, many questions about the stability and origin of this candidate ... -
Dynamical origin of the Dwarf Planet Ceres
Ribeiro de Sousa, Rafael; ; ; Neto, Ernesto Vieira ; Izidoro, Andre ; Alves, Abreuçon Atanasio (Icarus, 2022) [Artigo]
The Dwarf Planet Ceres revealed the presence of ammonia and other unique properties compared to other asteroids in the main belt which suggests that it was not formed in situ. We model the early dynamical evolution of the ... -
The 'breaking the chains' migration model for super-Earth foation: The effect of collisional fragmentation
Esteves, Leandro; Izidoro, André ; ; ; ; ; Winter, Othon C (Monthly Notices of the Royal Astronomical Society, 2022) [Artigo]
Planets between 1 and 4 R (Earth radius) with orbital periods <100 d are strikingly common. The migration model proposes that super-Earths migrate inwards and pile up at the disc inner edge in chains of mean motion resonances. ... -
A survey on extensions of the pure gravity swing-by maneuver
Ferreira, A. F.S.; de Moraes, R. V. ; ; Winter, O. C. ; Gomes, V. M. (Revista Mexicana de Astronomia y Astrofisica, 2021) [Artigo]
The present paper surveys the more recent techniques related to the swing-by maneuver, where a spacecraft changes its energy and angular momentum by passing close to celestial bodies. It is focused on the literature related ... -
Traveling between the Earth-Moon Lagrangian points and the earth
; ; ; Gomes, Vivian Martins (14th International Conference on Space Operations, 2016, 2016) [Trabalho apresentado em evento]
The idea of the present paper is to study orbital transfers for a spacecraft from the Lagrangian points in the Earth-Moon system to the Earth, as well as to the other Lagrangian points. The model used is the restricted ... -
Refined physical parameters for Chariklo's body and rings from stellar occultations observed between 2013 and 2020
; ; ; ; Gomes-Júnior, A. R.; ; ; ; ; Benedetti-Rossi, G. et al. (Astronomy and Astrophysics, 2021) [Resenha]
Context. The Centaur (10199) Chariklo has the first ring system discovered around a small object. It was first observed using stellar occultation in 2013. Stellar occultations allow sizes and shapes to be determined with ... -
Chaos identification through the autocorrelation function indicator (ACFI)
Carruba, V.; ; Domingos, R. C. ; ; Barletta, W. (Celestial Mechanics and Dynamical Astronomy, 2021) [Artigo]
Chaotic motion affecting small bodies in the Solar system can be caused by close encounters or collisions or by resonance overlapping. Chaotic motion can be detected using approaches that measure the separation rate of ... -
Quasi circular orbits around prolate bodies
Ribeiro, T.; Winter, O. C. ; Mourão, D. ; Boldrin, L. A.G. ; (Monthly Notices of the Royal Astronomical Society, 2021) [Artigo]
Recent observations of stellar occultations have revealed rings of particles around non-planetary bodies of the Solar system. These bodies are irregular and can be modelled by ellipsoids. In the context of numerical ... -
Formation of Earth-sized planets within the Kepler-1647 system habitable zone
Barbosa, G. O.; Winter, O. C. ; Amarante, A. ; (Monthly Notices of the Royal Astronomical Society, 2021) [Artigo]
The Kepler-1647 is a binary system with two Sun-type stars (≈1.22 and ≈0.97 M⊙). It has the most massive circumbinary planet (≈1.52 MJup) with the longest orbital period (≈1107.6 d) detected by the Kepler probe and is ... -
A study of distant retrograde orbits in the neighborhood of the moon
Winter, Othon C.; (Proceedings of the International Astronautical Congress, IAC, 2020) [Trabalho apresentado em evento]
In this work, we have numerically investigated a region of retrograde orbits around the Moon in the light of the four-body Sun-Earth-Moon-particle problem. In this context, the gravitation effects of the Sun was taken into ... -
Trajectory analysis of a spacecraft making a three-dimensional powered swing-by maneuver
Ferreira, A. F.S.; Moraes, R. V. ; ; Winter, O. C. (Advances in the Astronautical Sciences, 2018) [Trabalho apresentado em evento]
The present paper studies the problem of orbital maneuvers performed combining the passage of a spacecraft by a celestial body with an impulse applied to the spacecraft during the close approach. The motion of the spacecraft ... -
Mapping the density of particles over the surface of asteroid (101955) Bennu
Winter, Othon C.; Amarante, André (Proceedings of the International Astronautical Congress, IAC, 2017) [Trabalho apresentado em evento]
In the present work we study the motion of particles near the surface of Bennu. An application of the results is to give assistance for the selection of the sample site. Considering the gravitational potential given by the ... -
Using tethers to build a “capture portal” for the planets
; ; ; Santos, D. P.S.; ; Winter, O. C. (Advances in the Astronautical Sciences, 2018) [Trabalho apresentado em evento]
Several new applications of space tethers to maneuver spacecrafts have been suggested recently. Some of them are combinations with the sling shot effect used in several interplanetary missions. In one type of this family ... -
Dynamics of a space tether in binary asteroids
; ; ; Santos, D. P.S.; ; Winter, O. C. (Advances in the Astronautical Sciences, 2018) [Trabalho apresentado em evento]
The present paper studies the dynamics of space elevators constructed in double asteroids of the solar system, assuming an irregular shape for both bodies. To make this task, a tether is attached to the surface of one of ...