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The Rubble-Pile Asteroid Itokawa as Observed by Hayabusa
During the interval from September through early December 2005, the Hayabusa spacecraft was in close proximity to near-Earth asteroid 25143 Itokawa, and a variety of data were taken on its shape,Expand
Regolith Migration and Sorting on Asteroid Itokawa
High-resolution images of the surface of asteroid Itokawa from the Hayabusa mission reveal it to be covered with unconsolidated millimeter-sized and larger gravels, indicating that it has experienced considerable vibrations, which have triggered global-scale granular processes in its dry, vacuum, microgravity environment. Expand
Hayabusa2 arrives at the carbonaceous asteroid 162173 Ryugu—A spinning top–shaped rubble pile
The Hayabusa2 spacecraft measured the mass, size, shape, density, and spin rate of asteroid Ryugu, showing that it is a porous rubble pile, and observations of Ryugu's shape, mass, and geomorphology suggest that Ryugu was reshaped by centrifugally induced deformation during a period of rapid rotation. Expand
Touchdown of the Hayabusa Spacecraft at the Muses Sea on Itokawa
Initial findings about geological features, surface condition, regolith grain size, compositional variation, and constraints on the physical properties of this site are reported by using both scientific and housekeeping data during the descent sequence of the first touchdown. Expand
Simulation of space weathering of planet-forming materials: Nanosecond pulse laser irradiation and proton implantation on olivine and pyroxene samples
For the purpose of simulating the surface alteration process called “space weathering”, experiments of pulse laser irradiation, proton implantation, and laser irradiation to proton implanted samplesExpand
Comet 81P/Wild 2 Under a Microscope
The Stardust spacecraft collected thousands of particles from comet 81P/Wild 2 and returned them to Earth for laboratory study. The preliminary examination of these samples shows that the nonvolatileExpand
Mineralogy and Petrology of Comet 81P/Wild 2 Nucleus Samples
The bulk of the comet 81P/Wild 2 samples returned to Earth by the Stardust spacecraft appear to be weakly constructed mixtures of nanometer-scale grains, with occasional much larger ferromagnesian silicates, Fe-Ni sulfides,Fe-Ni metal, and accessory phases. Expand
The geomorphology, color, and thermal properties of Ryugu: Implications for parent-body processes
Spectral observations and a principal components analysis suggest that Ryugu originates from the Eulalia or Polana asteroid family in the inner main belt, possibly via more than one generation of parent bodies. Expand
Low thermal conductivity boulder with high porosity identified on C-type asteroid (162173) Ryugu
C-type asteroids are among the most pristine objects in the Solar System, but little is known about their interior structure and surface properties. Telescopic thermal infrared observations have soExpand
LIFE: Life Investigation For Enceladus A Sample Return Mission Concept in Search for Evidence of Life.
The LIFE mission concept is envisioned in two parts: first, to orbit Saturn (in order to achieve lower sampling speeds, approaching 2 km/s, and thus enable a softer sample collection impact than Stardust), and second, to sample Enceladus' plume, the E ring of Saturn, and the Titan upper atmosphere. Expand