80 documents found, page 1 of 8
Caustics of the restricted three-body problem
Santos, D. E.; Vieira Martins, R.; Winter, O. C. [UNESP]; Cordeiro, R. R.Made available in DSpace on 2022-04-29T08:47:11Z (GMT). No. of bitstreams: 0 Previous issue date: 1998-03-20; Trajectories of the planar, circular, restricted three-body problem are given in the configuration space through the caustics associated to the invariant tori of quasi-periodic orbits. It is shown that the caustics of trajectories librating in any particular resonance display some features associated to...
Controlling the eccentricity of polar lunar orbits
Winter, O. C. [UNESP]; Mourão, D. C.; Melo, C. F.; Giuliatti MacAu, E. N. [UNESP]; Winter, S. M.; Ferreira, J. L.Made available in DSpace on 2022-04-29T08:48:11Z (GMT). No. of bitstreams: 0 Previous issue date: 2008-12-01; It is well known that lunar satellites in polar orbits suffer a high increase on the eccentricity due to the gravitational perturbation of the Earth. That effect is a natural consequence of the Lidov-Kozai resonance. The final fate of such satellites is the collision with the Moon. Therefore, the contro...
Possibility of collision between co-orbital asteroids and the Earth
Domingos, R. C.; Winter, O. C. [UNESP]Made available in DSpace on 2022-04-29T08:48:45Z (GMT). No. of bitstreams: 0 Previous issue date: 2005-01-01; Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Considering hypothetical co-orbital asteroids with the Earth, Tatum (1997) presented a study about the necessary radial distance in order to produce collision. He ad...
Exploring sensitive dependence and transitivity to optimize travel time in chao...
Santana, S. H.S.; Macau, E. E.N.; Winter, O. C. [UNESP]; França, L. F.A.Made available in DSpace on 2022-04-29T09:12:16Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-01-01; Transitivity and sensitive dependence on initial conditions are the main characteristics of chaotic behavior. The latter one can be exploited so that small controlled perturbations in system parameters may imply a faster transfer in time from a desired start point to a neighborhood of a desired final st...
Powered swing-by maneuvers around the Moon
Silva, A. F.; Prado, A. F.B.A.; Winter, O. C. [UNESP]Made available in DSpace on 2022-04-29T09:12:17Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-01-01; A Swing-By maneuver occurs when a satellite approaches a celestial body to gain or lose energy from its gravitational field. The present work studies Swing-By maneuvers that are combined with the use of an impulsive thrust in different directions during the passage of the spacecraft by the periapsis of ...
Analysis of the secular problem for triple star systems
Carvalho, J. P.S.; De Moraes, R. Vilhena; Prado, A. F.B.A.; Winter, O. C. [UNESP]Made available in DSpace on 2022-04-29T09:12:17Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-01-01; The long-term dynamics of the three-body problem is studied. The goal is to study the motion of a planet (m1) around a star (m0) that is perturbed by a third-body (m2) (a planet or a brown dwarf star). The gravitational potential is developed in closed form up to the fourth order. Taking into account th...
Dynamics of a space tether in binary asteroids
Ferreira, A. F.S.; Prado, A. F.B.A.; Guerman, A. D.; Santos, D. P.S. [UNESP]; Burov, A.; Winter, O. C. [UNESP]Made available in DSpace on 2022-04-30T10:04:34Z (GMT). No. of bitstreams: 0 Previous issue date: 2018-01-01; 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 the asteroids, with a spacecraft attached in the other end. The analysis of the equ...
Using tethers to build a “capture portal” for the planets
Ferreira, A. F.S.; Prado, A. F.B.A.; Guerman, A. D.; Santos, D. P.S. [UNESP]; Burov, A.; Winter, O. C. [UNESP]Made available in DSpace on 2022-04-30T10:04:34Z (GMT). No. of bitstreams: 0 Previous issue date: 2018-01-01; 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 of applications, the tether is attached to an asteroid to make a rotation of the sp...
Trajectory analysis of a spacecraft making a three-dimensional powered swing-by...
Ferreira, A. F.S. [UNESP]; Moraes, R. V. [UNESP]; Prado, A. F.B.A.; Winter, O. C. [UNESP]Made available in DSpace on 2022-04-30T18:07:58Z (GMT). No. of bitstreams: 0 Previous issue date: 2018-01-01; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); 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 du...
Formation of Earth-sized planets within the Kepler-1647 system habitable zone
Barbosa, G. O. [UNESP]; Winter, O. C. [UNESP]; Amarante, A. [UNESP]; Macau, E. E.N.Made available in DSpace on 2022-05-01T05:29:33Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-07-01; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); 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 located within t...