Results 21 to 30 of about 1,039,308 (179)
Experimental characterization of the thrust induced by laser ablation on an asteroid [PDF]
, 2013 This paper presents an improved laser ablation model and compares the performance – Δv and mass efficiency - of laser ablation against contactless deflection methods based on ion-propulsion.
Vasile, Massimiliano +4 more
core +3 more sources
Bulk Thermal Conductivity of Granular Aggregates: Decoupling Coordination Number and Porosity
The Planetary Science JournalBoth internal evolution and orbital dynamics of asteroids are influenced by the thermal conductivity of their surface regolith and boulders, yet the microstructural factors that control it remain poorly constrained.
Bhuvan Agrawal +8 more
doaj +1 more source
The Planetary Science Journal, 2023 Near-Earth asteroids (NEAs) are a key test bed for investigations into planet formation, asteroid dynamics, and planetary defense initiatives. These studies rely on understanding NEA sizes, albedo distributions, and regolith properties.
Samuel A. Myers +6 more
doaj +1 more source
Predicting Performance of Hall Effect Ion Source Using Machine Learning
Advanced Intelligent Systems, Volume 7, Issue 3, March 2025.This study introduces HallNN, a machine learning tool for predicting Hall effect ion source performance using a neural network ensemble trained on data generated from numerical simulations. HallNN provides faster and more accurate predictions than numerical methods and traditional scaling laws, making it valuable for designing and optimizing Hall ...
Jaehong Park +8 more
wiley +1 more source
Simulating the (99942) Apophis Earth Flyby Using a Contact Binary Model
The Planetary Science JournalThis paper investigates the mass shifts of asteroid (99942) Apophis during its 2029 close encounter with Earth, using the contact dynamics method, a type of discrete element method. Unlike previous analyses, we model the asteroid as a contact binary body
Hai-Shuo Wang +2 more
doaj +1 more source
OSIRIS-APEX: An OSIRIS-REx Extended Mission to Asteroid Apophis
The Planetary Science Journal, 2023 The Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer (OSIRIS-REx) spacecraft mission characterized and collected a sample from asteroid (101955) Bennu.
Daniella N. DellaGiustina +53 more
doaj +1 more source
The Planetary Science JournalAsteroid Justitia is a special main-belt object, being an extremely red body with a steeper spectral slope than any other D-type asteroid. Conversely, its spectral and polarimetric properties resemble organics-rich Centaurs and trans-Neptunian objects ...
Anna Marciniak +18 more
doaj +1 more source
Spectral Evolution of Ceres’ Surface and Implications for Space Weathering
The Planetary Science JournalThe surface of Ceres exposed to the space environment will be gradually altered, but the evolution of its spectral properties remains poorly understood.
Qing Zhang +4 more
doaj +1 more source
The life and work of Ernest Sydney Keeping
Canadian Journal of Statistics, EarlyView.Abstract This article reviews the life and contributions of Ernest S. Keeping (1895–1984), a British‐born physicist who became a mathematics professor at the University of Alberta in 1929. He played a pivotal role in shaping the university's Mathematics Department, serving as its head from 1954 to 1961, and continuing to teach until 1970, nine years ...
David R. Bellhouse, Christian Genest
wiley +1 more source
DART Impact Ejecta Plume Evolution: Implications for Dimorphos
The Planetary Science JournalThe NASA Double Asteroid Redirection Test (DART) spacecraft impacted the moon Dimorphos of the [65803] Didymos binary system and changed the binary orbit period, demonstrating asteroid deflection by a kinetic impact and indicating that more momentum was ...
Andrew F. Cheng +31 more
doaj +1 more source