A5061886856- Astro and Planetary Science
- Planetary Science and Exploration
- Stellar, planetary, and galactic studies
- Space Satellite Systems and Control
- Astrophysics and Star Formation Studies
- Geology and Paleoclimatology Research
- Spacecraft Dynamics and Control
- Geomagnetism and Paleomagnetism Studies
- Aerospace Engineering and Control Systems
- Isotope Analysis in Ecology
- Scientific Research and Discoveries
National Institute for Space Research
2016-2019
Universidade Estadual Paulista (Unesp)
2008-2018
In the last two decades, new computational tools have been developed in order to aid space missions orbit around irregular small bodies. One of techniques consists rebuilding their shape tetrahedral polyhedron. This method is well suited determine and estimate certain physical features asteroids. However, a large effort necessary depending on quantity triangular faces chosen. Another based representation central body terms mascons (discrete spherical masses). The main advantage its...
Recent data processing showed the existence of a difference that can reach 25 per cent for dimensions asteroid (216) Kleopatra between radar observations and light curves. We rebuild shape from these new applying correction's factor size 1.15 estimate certain physical features by using polyhedral model method. In our computations, we use code avoids singularities line integrals homogeneous arbitrary shaped source. Then, find location equilibrium points through pseudo-potential energy...
One of the most accurate models currently used to represent gravity field irregular bodies is polyhedral approach. In this model, mass body assumed be homogeneous, which may not true for a real object. The main goal present paper study dynamical effects induced by three different internal structures (uniform, three- and four-layers) asteroid (21) Lutetia, an object that recent results from space probe suggest being at least partially differentiated. Mascon approach in work, consists dividing...
One of the techniques used in past decade to determine shape with a good accuracy and estimate certain physical features (volume, mass, moments inertia) asteroids is polyhedral model method. We rebuild asteroid 433 Eros using data from 1998 December observations probe Near-Earth-Asteroid-Rendezvous-Shoemaker. In our computations, we use code that avoids singularities line integrals homogeneous arbitrary shaped source. This evaluates gravitational potential function its first- second-order...
Here, we study the dynamical effects of solar radiation pressure (SRP) on a spacecraft that will survey near-Earth rotating asteroid (101955) Bennu when projected shadow is accounted for. The spacecraft's motion near modelled in frame fixed at centre asteroid, neglecting Sun gravity effects. We calculate SRP perihelion, semimajor axis and aphelion distances from Sun. goals this work are to analyse stability for both homogeneous inhomogeneous mass distribution equatorial orbits close Bennu....
The main goal of our work is to study the orbital dynamics a spacecraft near (87) Sylvia system. Here, we consider non-homogeneous mass distribution with dense core inside primary asteroid. Mascon gravity framework using shaped polyhedral source, from light-curve data, chosen calculate gravitational field. zero-velocity curves show four unstable equilibrium points. In absence any solar or other celestial body perturbations, numerical analysis in potential field done delineate region stable...
Aims. We study trajectories of planetesimals whose orbits decay due to gas drag in a primordial solar nebula and are perturbed by the gravity secondary body on an eccentric orbit mass ratio takes values from = 10-7 10-3 increasing ten times at each step. Each planetesimal ultimately suffers one three possible fates: (1) trapping mean motion resonance with body; (2) collision consequent increase its mass; or (3) diffusion after crossing body.
Aims. We investigate the dynamics of pebbles immersed in a gas disk interacting with planet on an eccentric orbit. The model has prescribed gap around location planetary orbit, as is expected for giant mass range 0.1–1 Jupiter masses. sizes 1 cm to 3 m are placed ring outside orbit at distances between 10 and 30 Hill radii. process accumulation closer edge, its possible implication accretion, importance eccentricity this motivations behind present contribution.
The Gefion asteroid family is a group of S-type asteroids located between the 8J:-3A and 5J:-2A mean-motion resonances. resonance seems to be responsible for absence right side V-shape this family. We aim in work present detailed study on family, motivated by incompatibility found previous age estimations fact that could seen as one most probable sources L-chondrite meteorites. After eliminating all possible taxonomical dynamical interlopers, we use Monte Carlo method analyze semi-major axis...