Results 91 to 100 of about 394,300 (243)
Simulations of LQR Control on Linear Spacecraft Dynamics about Asteroid Equilibrium Points [PDF]
, 2021 Abhijeet Aryal
openalex +1 more source
A framework for evolving assumptions in risk analysis
Risk Analysis, EarlyView.Abstract Risk assessment can be used to evaluate the risks of complex systems and emerging technologies, such as the human–climate nexus and automation technologies, and to inform pathways and policies. Due to the interconnected and evolutionary features of such topics, risk analysts must navigate the dynamics of changing assumptions and probabilities ...
Kendrick Hardaway, Roger Flage
wiley +1 more source
The Compositional Structure of the Asteroid Belt [PDF]
, 2015 The past decade has brought major improvements in large-scale asteroid discovery and characterization with over half a million known asteroids and over 100,000 with some measurement of physical characterization. This explosion of data has allowed us to create a new global picture of the Main Asteroid Belt. Put in context with meteorite measurements and
arxiv +1 more source
The Cumulation of Debris Clouds around a Fast-rotating Asteroid
The Astrophysical JournalThe rotational mass loss has been realized to be a prevalent mechanism to produce low-speed debris near the asteroid, and the size composition of the asteroid’s surface regolith has been closely measured by in situ explorations.
Chenyang Huang +5 more
doaj +1 more source
Odessa Astronomical Publications, 2016 Lately it has become possible to sufficiently precise definition of the physical and geometric characteristics of asteroid systems using radar observations (http://echo.jpl.nasa.gov/~lance/binary.neas.html), which allowed calculating the asymmetry of the
V. V. Troianskyi
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ASTEROID SECULAR DYNAMICS: CERES’ FINGERPRINT IDENTIFIED [PDF]
The Astrophysical Journal, 2015 Accepted for publication in the ...
Bojan Novaković +3 more
openaire +4 more sources
Experimental Physiology, EarlyView.Abstract Despite exercise countermeasures to sustain health and performance in spaceflight, complete maintenance of muscle mass and functions in microgravity is still not possible for most astronauts. The principal cause of the limited effectiveness of existing exercise countermeasures is the difficulty in achieving full loading forces in space.
Alessandra Bosutti +6 more
wiley +1 more source
Scattering V-type asteroids during the giant planets instability: A step for Jupiter, a leap for basalt [PDF]
, 2017 V-type asteroids are a taxonomic class whose surface is associated to a basaltic composition. The only known source of V-type asteroids in the Main Asteroid Belt is (4) Vesta, that is located in the inner part of the belt. However, many V-type asteroids cannot be dynamically linked to Vesta., in particular, those asteroids located in the middle and ...
arxiv +1 more source
Global Asteroid Risk Analysis [PDF]
arXiv, 2014 Potentially impacting asteroids were analysed for their impact risk on the Earth. To this end, the Asteroid Risk Mitigation Optimization and Research (ARMOR) tool is currently being developed. The tool's modules are described and their validation is documented.
arxiv
Six Degree-of-Freedom Body-Fixed Hovering over Unmapped Asteroids via LIDAR Altimetry and Reinforcement Meta-Learning [PDF]
, 2019 We optimize a six degrees of freedom hovering policy using reinforcement meta-learning. The policy maps flash LIDAR measurements directly to on/off spacecraft body-frame thrust commands, allowing hovering at a fixed position and attitude in the asteroid body-fixed reference frame. Importantly, the policy does not require position and velocity estimates,
arxiv +1 more source