Results 121 to 130 of about 15,938 (229)

Chamber‐by‐Chamber Measurements of Planktonic Foraminiferal Mg, Sr, and Na to Ca Ratios With Femtosecond LA‐ICP‐MS

Rapid Communications in Mass Spectrometry, Volume 40, Issue 7, 15 April 2026.
ABSTRACT Rationale Distribution patterns of foraminifera are controlled by environmental parameters such as temperature, salinity, and nutrient concentrations in each water mass. Since trace elements to Ca ratios of marine microfossil calcite test of foraminifera record environmental and ecological habitat information, we used femtosecond (fs) LA‐ICP ...
Toshihiro Yoshimura, Qing Chang, Naohiko Ohkouchi, Yoshiyuki Ishitani, Dana Ulanova, Hirotoshi Endo, Junichiro Kuroda, Yurika Ujiié   +7 more
wiley   +1 more source

Reactive Molecular Dynamics Simulations of Iron Reduction on Lunar and Asteroidal Surfaces by Micrometeoroids and Solar Wind

The Astrophysical Journal
Regolith grains and rock surfaces altered by space weathering on the Moon and S-type asteroids contain nanometer-sized metallic iron particles, known as nanophase iron (npFe ^0 ).
Daigo Shoji
doaj   +1 more source

Asteroid-NeRF: A deep-learning method for 3D surface reconstruction of asteroids

Astronomy & Astrophysics
Context. Asteroids preserve important information about the origin and evolution of the Solar System. Three-dimensional (3D) surface models of asteroids are essential for exploration missions and scientific research. Regular methods for 3D surface reconstruction of asteroids, such as stereo-photogrammetry (SPG), usually struggle to reconstruct ...
Shihan Chen, Bo Wu, Hongliang Li, Zhaojin Li, Yi Liu   +4 more
openaire   +1 more source

Shaking and Tumbling: Short- and Long-timescale Mechanisms for Resurfacing of Near-Earth Asteroid Surfaces from Planetary Tides and Predictions for the 2029 Earth Encounter by (99942) Apophis

The Planetary Science Journal
Spectral characterization of near-Earth asteroids (NEAs) has revealed a continuum of space-weathered states for the surfaces of S-complex NEAs, with Q-class NEAs, an S-complex subclass, most closely matching the unweathered surfaces of ordinary chondrite
R.-L. Ballouz, H. Agrusa, O.S. Barnouin, K.J. Walsh, Y. Zhang, R.P. Binzel, V.J. Bray, D. N. DellaGiustina, E.R. Jawin, J.V. DeMartini, A. Marusiak, P. Michel, N. Murdoch, D.C. Richardson, E.G. Rivera-Valentín, A.S. Rivkin, Y. Tang   +16 more
doaj   +1 more source

Candidate Main-belt Asteroids for Surface Heterogeneity

The Astronomical Journal
Abstract Large terrestrial bodies in our solar system like the Earth, Mars, Mercury, and the Moon exhibit geologically complex surfaces with compositional heterogeneity. From past studies using large telescopes and spacecraft, it was shown that asteroids with diameters larger than 100 km also show surface heterogeneity at hemispheric ...
Hasegawa, Sunao, Marsset, Michaël, Demeo, Francesca, Hanuš, Josef, Binzel, Richard, Bus, Schelte, Burt, Brian, Polishook, David, Thomas, Cristina, Geem, Jooyeon, Ishiguro, Masateru, Kuroda, Daisuke, Vernazza, Pierre   +12 more
openaire   +3 more sources

Radar Circular Polarization Ratio of Near-Earth Asteroids: Links to Spectral Taxonomy and Surface Processes

The Planetary Science Journal
The radar circular polarization ratio (CPR) is an indicator of near-surface, wavelength-scale complexity. Interestingly, previous surveys also noted an association between near-Earth asteroid (NEA) disk-integrated CPR and spectral taxonomic class ...
Edgard G. Rivera-Valentín, Betzaida Aponte-Hernández, Patrick A. Taylor, Michael C. Nolan, Ellen S. Howell, Dany Waller, Luisa F. Zambrano-Marín, Anne K. Virkki, Ronald-Louis Ballouz, Angela M. Stickle   +9 more
doaj   +1 more source

Asteroid gravitational field calculation via GeodesyNets with quadratic layers

Geo-spatial Information Science
Asteroid gravity inversion is a method used to infer the internal density distribution of small celestial bodies through external gravitational measurements.
Zhitao Fu, Weitong Li, Shanhong Liu
doaj   +1 more source

Categorization of Spatial and Temporal Ejecta Outcomes in Binary Systems Based on Variations of the Didymos System

The Planetary Science Journal
With the increasing number of binary asteroid systems being discovered, ejecta studies must expand from solely investigating single-body systems to modeling more complex multiple-body systems. For example, the Double Asteroid Redirection Test provides an
Jennifer N. Larson, Yanga Fernandez, Gal Sarid   +2 more
doaj   +1 more source

Space Weathering Age of Itokawa and Eros by Machine Learning

The Planetary Science Journal
Near-Earth asteroids such as Itokawa and Eros provide valuable insights into the collisional and surface evolution of the inner solar system. As S-type asteroids, their surfaces are altered by space weathering (SW) from solar wind and micrometeorite ...
Lakshika Palamakumbure, David Korda, Tomáš Kohout   +2 more
doaj   +1 more source

Charged Ejecta Clouds from Granular Beds after Slow Impacts

The Planetary Science Journal
Low-velocity impacts are a significant process on all planetary surfaces, from rebounding particles on asteroids to saltating grains on Earth. Due to triboelectric effects, the material involved can be charged. We carried out experiments to study the net
Matthias Keulen, F. Oehme, G. Wurm, J. E. Kollmer   +3 more
doaj   +1 more source