A5024028420- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Planetary Science and Exploration
- Solar and Space Plasma Dynamics
- Quantum chaos and dynamical systems
- Ionosphere and magnetosphere dynamics
- Geomagnetism and Paleomagnetism Studies
- Spacecraft Dynamics and Control
- Nuclear physics research studies
- Scientific Research and Discoveries
- Geophysics and Gravity Measurements
- Astrophysics and Star Formation Studies
- Numerical methods for differential equations
- Relativity and Gravitational Theory
- Advanced NMR Techniques and Applications
- Elasticity and Wave Propagation
- Stability and Controllability of Differential Equations
- Space Satellite Systems and Control
- Nonlinear Waves and Solitons
- Astronomy and Astrophysical Research
- Atomic and Subatomic Physics Research
- Nonlinear Dynamics and Pattern Formation
- Astronomical Observations and Instrumentation
- Historical Astronomy and Related Studies
- Isotope Analysis in Ecology
University of Rome Tor Vergata
2010-2024
University of Vienna
2005-2022
Austrian Academy of Sciences
2015-2022
Space Research Institute
2015-2022
Aristotle University of Thessaloniki
2019
Institute for Medieval Research
2015
University of Namur
2012-2014
Trinity House
2014
Constellation Technology (United States)
2008
The ESA-JAXA BepiColombo mission will provide simultaneous measurements from two spacecraft, offering an unprecedented opportunity to investigate magnetospheric and exospheric dynamics at Mercury as well their interactions with the solar wind, radiation, interplanetary dust. Many scientific instruments onboard spacecraft be completely, or partially devoted study near-space environment of complex processes that govern it. issues remain unsolved even after MESSENGER ended in 2015. specific...
The problem of analytical determination the stability domain around points L4 or L5 Lagrangian equilateral configuration three-body has served in literature as a basic celestial mechanical model probing predictive power so-called Nekhoroshev theory exponential non-linear Hamiltonian dynamical systems. All investigations this framework have so far been based on circular restricted (CRTBP). In work, we extend estimates case planar elliptic-restricted (ERTBP). To end, introduce an explicit...
The first Earth Trojan has been observed and found to be on an interesting orbit close the Lagrange point L4. In present study, we therefore perform a detailed investigation of stability its moreover extend study give idea probability finding additional Trojans. Our results are derived using three different approaches. first, derive analytical mapping in spatial elliptic restricted three-body problem find phase space structure dynamical problem. We then explore asteroid context geometry,...
Context . The dramatic event of the 2029 close encounter between Earth and asteroid Apophis on April 13 at a minimum distance 38 400 km constitutes an opportunity to make investigations about modeling rotational changes during event. Aims In this paper we deepen previous study caused by gravitational effects encounter, using important constraints initial conditions brought new recent observational data. We also evaluate triaxial form motion its axis rotation in space, as well modifications...
We investigate the combined effect of solar wind, Poynting-Robertson drag, and frozen-in interplanetary magnetic field on motion charged dust grains in our system. For this reason we derive a secular theory by means averaging method validate it with numerical simulations un-averaged equations motions. The predicts that particles is mainly affected z-component axis, or normal component field. leads to an increase decrease semi-major axis depending its functional form sign charge grain. It...
We analyse the combined effect of Poynting–Robertson and solar-wind drag on space debris. derive a model within Cartesian, Gaussian Hamiltonian frameworks. focus geosynchronous resonance, although results can be easily generalized to any resonance in Medium Earth Orbit regions located outside geostationary ring. By numerical analytical techniques, we compute drift semimajor axis due drag. After linear stability analysis equilibria, combine careful investigation regular, resonant, chaotic...
Abstract With the successful launch of satellite mission Gravity Recovery and Climate Experiment (GRACE) Follow‐On in May 2018 opportunity arises to resume analysis accelerometer data regarding space weather induced perturbations Earth's thermosphere. On 21 August a complex interplanetary coronal mass ejections occurred on Sun, which subsequently triggered an unexpected large geomagnetic storm 26 August. We present detailed ejection eruption explore perturbation neutral density upper...
Compressive plasma turbulence is investigated at sub-ion scales in the solar wind using both Fast Plasma Investigation (FPI) instrument on Magnetospheric MultiScale mission (MMS), as well calibrated spacecraft potential data from Spin Plane Double Probe (SDP) instrument. The FPI allow scale region (fsc ≳ 1 Hz) to be before instrumental noise becomes significant a frame frequency of fsc ≈ 3 Hz. Whereas allows measurement up 40 In this work, we give detailed description density estimation SDP...
Context. The close approach of the asteroid (99942) Apophis to Earth on April 13, 2029, at a distance about 38 330 km, is naturally considered dramatic and fascinating event by astronomical community, as well public.
Abstract. Current knowledge on the description of interplanetary magnetic field is reviewed with an emphasis kinematic approach as well analytic expression. Starting Parker spiral approach, further effects are incorporated into this fundamental model, including latitudinal dependence, poleward component, solar cycle and polarity tilt angle axis. Further extensions discussed in view magnetohydrodynamic treatment, turbulence effect, pickup ions, stellar wind models. The models serve a useful...
The aim of this study is first to determine the gravity field comet 67P/Churyumov–Gerasimenko and second derive solar component precession rate nutation coefficients spin-axis nucleus, i.e. without direct, usually larger, effect outgassing. related moments inertia are obtained from two polyhedra, which provided by Optical, Spectroscopic, Infrared Remote Imaging System (OSIRIS) NAVigation CAMera (NAVCAM) experiments on Rosetta, based assumption uniform density for nucleus. We also calculate...
Context. Thanks to various space missions and the progress of ground-based observational techniques, knowledge asteroids has considerably increased in recent years.
We investigate the interaction of dust with space plasmas and spacecraft a special focus on typical values equilibrium charge time scales required to reach them. It is well known that objects in become charged through combination number different processes: photoelectric effect, collection free electrons ions from plasma, by secondary electron emission due impact highly energetic particles. In state, currents between plasma object are balanced. However, perturbations orbit body distribution...
We generalize the Laplace resonance among three satellites, S1, S2 , and S3, by considering different ratios of mean-longitude variations. These resonances, which we call Laplace-like, are classified as first order in cases 2:1&2:1, 3:2&3:2, 2:1&3:2 second case 3:1&3:1 resonance, mixed 2:1&3:1 resonance. consider a model that includes gravitational interaction with central body together effect due to its oblateness, mutual influence satellites S2, S3 secular fourth satellite S 4 plays role...
Based on a linearized model of the Yarkovsky effect, we investigate in this paper dependence semimajor axis drift $Δa$ celestial body its size, spinning obliquity, initial orbit and thermal parameters surface. With appropriate simplification approximation, obtain analytical solutions to perturbation equations for motion asteroids influenced by they are then verified numerical simulations full motion. These present explicitly dependencies dynamical asteroid. these formulae $Δa$, combined...