A5086987063- Astro and Planetary Science
- Planetary Science and Exploration
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Geology and Paleoclimatology Research
- Space Satellite Systems and Control
- Solar and Space Plasma Dynamics
- Astronomical Observations and Instrumentation
- Marine and environmental studies
- Elasticity and Wave Propagation
- Spacecraft and Cryogenic Technologies
- COVID-19 and healthcare impacts
- Isotope Analysis in Ecology
- Advances in Oncology and Radiotherapy
- Geomagnetism and Paleomagnetism Studies
- Geological and Geochemical Analysis
- Economic and Financial Impacts of Cancer
- Psychotherapy Techniques and Applications
- High-pressure geophysics and materials
Universidade Estadual Paulista (Unesp)
2015-2023
Federal Institute of São Paulo
2019-2022
Hospital de Câncer de Pernambuco
2022
Universidade Estadual de Mato Grosso do Sul
2020-2021
University of Maryland, College Park
2015
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...
ABSTRACT The (153591) 2001 SN263 asteroid system, a target of the first Brazilian interplanetary space mission, is one known three triple systems within population near-Earth asteroids. One mission objectives to collect data about formation this system. analysis these will help in investigation physical and dynamical structures components (Alpha, Beta, Gamma) order find vestiges related its origin. In work, we assume irregular shape system as uniform-density polyhedra computationally...
ABSTRACT The classical scenario of terrestrial planet formation is characterized by a phase giant impacts among Moon-to-Mars mass planetary embryos. While the classic model and its adaptations have produced adequate analogues outer three planets, Mercury’s origin remains elusive. high-core fraction compared to Earth’s particularly outstanding. Among collisional hypotheses, this feature has been long interpreted as outcome an energetic impact two massive protoplanets. Here, we revisit with...
Radar observations show that (16) Psyche is one of the largest and most massive asteroids M-class located in main belt, with a diameter approximately 230 km. This fact makes unique object since indicated an iron-nickel composition. It believed this body may be what was left metal core early planet would have been fragmented over millions years due to violent collisions. In work we study variety dynamical aspects related surface, as well as, environment around asteroid. We use computational...
Close polar and circular orbits are of great interest for the exploration natural satellites. There still no studies in literature investigating around Titania, largest satellite Uranus. In this work, we present results a set numerical simulations carried out to obtain long-duration probe Titania. Through an expansion gravitational potential up second order, asymmetry field due Titania’s coefficient C22, zonal J2, perturbation Uranus is considered. The analysis lifetime sensitivity possible...
ABSTRACT The New Horizons space probe led the first close flyby of one most primordial and distant objects left over from formation Solar system, contact binary Kuiper Belt object (486958) Arrokoth. This is composed two progenitors, lobes called Ultima Thule. In current work, we investigate Arrokoth’s surface in detail to identify location equilibrium points also explore each lobe’s individual dynamic features. We assume that irregular shape a homogeneous polyhedra binary. its...
In this work is investigated the possibility of close-binary star systems having Earth-size planets within their habitable zones. First, we selected all known with confirmed (totaling 22 systems) to calculate boundaries respective zones (HZ). However, only eight had data necessary for computation HZ. Then, numerically explored stability each one using test particles. From results, five that have stable regions inside (HZ), namely Kepler-34, 35, 38, 413 and 453. For these cases in HZ, perform...
Abstract In this study, we study the dynamics of particles around Bennu. The goal is to understand stability, evolution, and final outcome simulated asteroid. According results, particle sizes can be divided into two main groups depending on their behavior. Particles smaller than a centimeter are quickly removed from system by solar radiation pressure, while larger few centimeters dominated gravitational field Because its shape spin period, Bennu has eight equilibrium points it. structure...
The asteroid Psyche is highlighted in the literature for being one of largest ever observed,located main belt, with a diameter approximately 232 km. Classified as typeM, it speculated based on radar observations, that an exposed core primitive planet,composed mainly iron-nickel. Although was initially believed to have high density,reaching values 7.6 g/cm3, recent studies indicate lower values. Given such uncertainty, wesought not use specific density, but explore this range possible...
The Kepler-1647 is a binary system with two Sun-type stars (approximately 1.22 and 0.97 Solar mass). It has the most massive circumbinary planet (1.52 Jupiter mass) longest orbital period (1,107.6 days) detected by Kepler probe located within habitable zone (HZ) of system. In this work, we investigated ability to form house an Earth-sized its HZ. First, computed limits HZ performed numerical stability tests that region. We found three sub-regions show stability, one internal, co-orbital,...
Context. The Centaur (10199) Chariklo has the first ring system discovered around a small object. It was observed using stellar occultation in 2013. Stellar occultations allow sizes and shapes to be determined with kilometre accuracy, provide characteristics of occulting object its vicinity. Aims. Using between 2017 2020, our aim is constrain physical parameters rings. We also determine structure rings, obtain precise astrometrical positions Chariklo. Methods. predicted organised several...
In this work, we present the results of a set numerical simulations carried out to obtain long-duration orbits for probe around Titania, Uranus' largest satellite. We also propose orbital maneuvers extend lifetime some orbits. Titania's $J_2$ and $C_{22}$ gravitational coefficients perturbation are considered. The analysis sensitivity due possible errors in values is investigated using multiple regression models. Simulations were performed eccentricity equal 10-4, maps constructed. show that...
The classical scenario of terrestrial planet formation is characterized by a phase giant impacts among Moon-to-Mars mass planetary embryos. While the classic model and its adaptations have produced adequate analogs outer three planets, Mercury's origin remains elusive. high-core fraction compared to Earth's particularly outstanding. Among collisional hypotheses, this feature has been long interpreted as outcome an energetic impact two massive protoplanets. Here, we revisit with focus on...