33 documents found, page 1 of 4
Studying mid-range planar orbits around phobos
Cavalca, M. P.O.; Prado, A. F.B.A.; Formiga, J. K.S. [UNESP]; Gomes, V. M. [UNESP]; Sanchez, D. M.Made available in DSpace on 2022-04-28T19:11:06Z (GMT). No. of bitstreams: 0 Previous issue date: 2018-10-01; The goal of the present paper is to search and study mid-range planar orbits for a spacecraft traveling near Phobos. The first step is to make a numerical search and classification of natural orbits based in the concept of “Quasi Satellite Orbits” (QSO). The effects of the eccentricity of Phobos and the...
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...
A survey on extensions of the pure gravity swing-by maneuver
Ferreira, A. F.S. [UNESP]; de Moraes, R. V. [UNESP]; Prado, A. F.B.A.; Winter, O. C. [UNESP]; Gomes, V. M. [UNESP]Made available in DSpace on 2022-05-01T10:18:55Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-01-01; 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 to extensions of this maneuver, with emphasis in the powered version, where an i...
Dynamics around an asteroid modeled as a mass tripole
Santos, L. B.T.; Marchi, L. O.; Sousa-Silva, P. A. [UNESP]; Sanchez, D. M.; Aljbaae, S.; Prado, A. F.B.A.Made available in DSpace on 2021-06-25T10:14:29Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-01-01; The orbital dynamics of a spacecraft orbiting around irregular small celestial bodies is a challenging problem. Difficulties to model the gravity field of these bodies arise from the poor knowledge of the exact shape as observed from the Earth. In order to understand the complex dynamical environment in...
XIX Brazilian Colloquium on Orbital Dynamics (2018): A solid path to the 21st c...
De Melo, C. F.; Prado, A. F.B.A.; Macau, E. E.N.; Winter, O. C. [UNESP]Made available in DSpace on 2020-12-12T02:31:26Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-11-04; The Brazilian Colloquium on Orbital Dynamics (CBDO) is a scientific meeting that takes place every two years since 1982. Its main goal is to bring together researchers, professors, undergraduate and post graduate students who develop works on pure and applied Celestial Mechanics in the same lectures and...
Effects of the mass parameter in the optimum direction of impulse and energy va...
Ferreira, A. F.S. [UNESP]; Moraes, R. V. [UNESP]; Prado, A. F.B.A.; Winter, O. C. [UNESP]Made available in DSpace on 2020-12-12T02:31:33Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-11-04; The energy of a spacecraft, relative to the primary body of the system, before and after a Powered Swing-By maneuver with an impulse applied during the close encounter with the secondary body is studied. The Powered Swing-By maneuver is a combination of the effect of the gravity of a celestial body and ...