A5019855880- Astro and Planetary Science
- Planetary Science and Exploration
- Space Satellite Systems and Control
- Space Exploration and Technology
- Stellar, planetary, and galactic studies
- High-pressure geophysics and materials
- Spacecraft Dynamics and Control
- Isotope Analysis in Ecology
- Spacecraft and Cryogenic Technologies
- Granular flow and fluidized beds
- Experimental and Theoretical Physics Studies
- Atmospheric and Environmental Gas Dynamics
- Astrophysics and Star Formation Studies
- Engineering and Agricultural Innovations
- earthquake and tectonic studies
- Aerospace Engineering and Control Systems
- Aerospace Engineering and Energy Systems
- Fluid Dynamics Simulations and Interactions
- Linguistics and Cultural Studies
- Rangeland Management and Livestock Ecology
- Control and Dynamics of Mobile Robots
- Nuts composition and effects
- Fluid Dynamics and Mixing
- Calibration and Measurement Techniques
- Cyclone Separators and Fluid Dynamics
Arbed (Luxembourg)
2022
Institute of Space and Astronautical Science
2019-2020
Japan Aerospace Exploration Agency
2020
University of Colorado Boulder
2014-2019
Laboratory for Atmospheric and Space Physics
2017
Abstract During its approach to asteroid (101955) Bennu, NASA’s Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer (OSIRIS-REx) spacecraft surveyed Bennu’s immediate environment, photometric properties, rotation state. Discovery of a dusty natural satellite, or unexpected characteristics would have had consequences for the mission’s safety observation strategy. Here we show that observations during this period were highly sensitive satellites (sub-meter...
A comprehensive method for modeling the motion of a spherical pod at surface an asteroid is presented. Using triangular faceted surfaces, largest features (global shape, monoliths, and large boulders) are modeled. The presence smaller rocks accounted using stochastic model rock generation collision. contact dynamics on regolith or harder including multiple points situations, described. force, torque, coefficient rolling resistance introduced, explained, estimated. Finally, this applied to...
This paper presents a methodology for the fast, parallelized simulation of bouncing deployment lander/rover probe to an asteroid or comet. The target comet is represented implicitly with signed distance field, allowing fast collision detection high-resolution shape models. gravity field body voxelized make run-time computations efficient. Collisions and contact motion between arbitrary shape/inertia are evaluated using hard-surface model restitution friction. shape, gravity, models well...
This paper documents the prearrival planning strategy and analysis for deployment of rovers on board Japanese Hayabusa2 asteroid sample return mission. will allow rigorous comparison with postarrival results obtained at a future date. arrive Ryugu sometime between June July 2018. During its stay, spacecraft deploy three MINERVA-II obtain several surface samples. The autonomous descent guidance requires to avoid some exclusion zone around target site(s). Although limited current knowledge...
This paper investigates the sensitivities of spherical lander deployment to small bodies. Previous work established methods simulate motion such landers in gravitationally and topographically complex small-body environment. These are extended, primarily through inclusion a "persistent" rock model that accounts for observed distribution rocks boulders on surface. The resulting framework is applied investigate effects relevant environmental hardware parameters trends lander. In dynamically...
This research focuses on the design and reconstruction of first touchdown Hayabusa2 asteroid Ryugu. Because plethora boulders, landing operation required high accuracy to ensure spacecraft safety. paper therefore investigates a pinpoint sequence using retroreflective marker as an artificial landmark. First, dynamical environment in vicinity Ryugu is explored for precise trajectory analyses; particularly, irregular gravitational field around computed, which has impact motion. Based dynamics...
The Near-Earth Asteroid Characterization and Observation (NEACO) mission is a concept study proposing to explore the fast-rotating asteroid (469219) 2016 , one of Earth's few quasi-satellites. In this study, SmallSat spacecraft performs scientific investigation that characterizes at sufficient degree enable future, more in-depth missions. 166 kg NEACO uses low-thrust, solar electric propulsion system reach within 22 months from launch. Its instrument suite consists two optical cameras,...
Hayabusa2 deployed two artificial landmarks called "target markers (TMs)" on the asteroid Ryugu for autonomous landing control. To achieve precise deployment target sites, TMs were designed to dissipate kinetic energy and released near surface (with an altitude of less than 40 m). This study evaluates performance ballistic in actual microgravity environment by reconstructing trajectories from optical, altimetric, radiometric data. In addition, based reconstructed trajectories, low-velocity...
The lift-off velocity is defined as the at which a particle, moving tangentially on surface of some arbitrary body, will lift off from that and enter orbit. A vectorial expression for this was previously derived dimensionless particles. This theory extended to be applicable exploration craft with finite size are envisioned missions small bodies our solar system. For realistic mission scenarios, shown independent size, depend strongly radius curvature target body; useful in operational design...
The Juventas CubeSat, will be delivered to the Didymos binary asteroid system by ESA's Hera mission within context of Asteroid Impact and Deflection Assessment (AIDA) international collaboration. AIDA is a technology demonstration kinetic impactor concept deflect small characterize its physical properties. Due launch in 2024, would travel Didymos. It explore crater formed impact NASA’s Double Redirection Test (DART). HERA carry two 6U CubeSats, one which CubeSat developed GomSpace...