The Geologically Recent Giant Impact Basins at Vesta’s South Pole

@article{Schenk2012TheGR,
  title={The Geologically Recent Giant Impact Basins at Vesta’s South Pole},
  author={Paul M. Schenk and David P. O'Brien and Simone Marchi and R. W. Gaskell and Frank Preusker and Thomas Roatsch and Ralf Jaumann and Debra L. Buczkowski and Thomas B. McCord and Harry Y. McSween and David J. Williams and Aileen Yingst and Carol A. Raymond and Christopher T. Russell},
  journal={Science},
  year={2012},
  volume={336},
  pages={694 - 697}
}
A New Dawn Since 17 July 2011, NASA's spacecraft Dawn has been orbiting the asteroid Vesta—the second most massive and the third largest asteroid in the solar system (see the cover). Russell et al. (p. 684) use Dawn's observations to confirm that Vesta is a small differentiated planetary body with an inner core, and represents a surviving proto-planet from the earliest epoch of solar system formation; Vesta is also confirmed as the source of the howardite-eucrite-diogenite (HED) meteorites… 
The Violent Collisional History of Asteroid 4 Vesta
TLDR
Dawn observations confirm that Vesta is a small differentiated planetary body with an inner core, and represents a surviving proto-planet from the earliest epoch of solar system formation, and presents the mineralogical characterization of Vesta, revealing that this asteroid underwent a complex magmatic evolution that led to a differentiated crust and mantle.
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TLDR
Dawn's observations confirm that Vesta is a small differentiated planetary body with an inner core, and represents a surviving proto-planet from the earliest epoch of solar system formation, and reveal its color and photometric diversity are indicative of its status as a preserved, differentiated protoplanet.
Spectroscopic Characterization of Mineralogy and Its Diversity Across Vesta
TLDR
The mineralogy of Vesta, based on data obtained by the Dawn spacecraft’s visible and infrared spectrometer, is consistent with howardite-eucrite-diogenite meteorites, which suggests a complex magmatic evolution that led to a differentiated crust and mantle.
Dawn completes its mission at 4 Vesta
The Dawn mission was designed to test our hypothesis about the origin and evolution of the early solar system by visiting the largest differentiated basaltic asteroid, 4 Vesta, believed to be a
The structure of the asteroid 4 Vesta as revealed by models of planet-scale collisions
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Three-dimensional simulations of Vesta’s global evolution under two overlapping planet-scale collisions closely reproduce its observed shape, and provide maps of impact excavation and ejecta deposition.
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Analysis of data from the Dawn spacecraft implies that asteroid Vesta is rich in volatiles, and models of Vesta’s evolution based on studies of howardite, eucrite, and diogenite meteorites are tested, finding that global Fe/O and Fe/Si ratios are consistent with HED compositions.
Pitted Terrain on Vesta and Implications for the Presence of Volatiles
TLDR
Analysis of data from the Dawn spacecraft implies that asteroid Vesta is rich in volatiles, suggesting that impactor materials are preserved locally in relatively high abundance on Vesta and thatimpactor composition has played an important role in shaping the asteroid’s geology.
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References

SHOWING 1-10 OF 29 REFERENCES
The Violent Collisional History of Asteroid 4 Vesta
TLDR
Dawn observations confirm that Vesta is a small differentiated planetary body with an inner core, and represents a surviving proto-planet from the earliest epoch of solar system formation, and presents the mineralogical characterization of Vesta, revealing that this asteroid underwent a complex magmatic evolution that led to a differentiated crust and mantle.
Vesta’s Shape and Morphology
TLDR
Dawn observations confirm the large impact basin at Vesta's south pole and reveal evidence for an earlier, underlying large basin (Veneneia), underscoring Vesta’s unique role as a transitional solar system body.
Color and Albedo Heterogeneity of Vesta from Dawn
TLDR
Dawn's observations confirm that Vesta is a small differentiated planetary body with an inner core, and represents a surviving proto-planet from the earliest epoch of solar system formation, and reveal its color and photometric diversity are indicative of its status as a preserved, differentiated protoplanet.
Spectroscopic Characterization of Mineralogy and Its Diversity Across Vesta
TLDR
The mineralogy of Vesta, based on data obtained by the Dawn spacecraft’s visible and infrared spectrometer, is consistent with howardite-eucrite-diogenite meteorites, which suggests a complex magmatic evolution that led to a differentiated crust and mantle.
Mega‐ejecta on asteroid Vesta
Asteroid 4 Vesta, sometimes called the “smallest terrestrial planet”, will be orbited next July by NASA's Dawn mission. This will be the first time a small planet is visited by a spacecraft, and
Meteorites may follow a chaotic route to Earth
It is widely believed that meteorites originate in the asteroid belt, but the precise dynamical mechanism whereby material is transported to Earth has eluded discovery. The observational data for the
Impact excavation on Asteroid 4 Vesta: Hubble Space Telescope results
Hubble Space Telescope images of asteroid 4 Vesta obtained during the favorable 1996 apparition show an impact crater 460 kilometers in diameter near the south pole. Color measurements within the
Chips off of Asteroid 4 Vesta: Evidence for the Parent Body of Basaltic Achondrite Meteorites
TLDR
The sizes, ejection velocities of 500 meters per second, and proximity of these fragments to the 3:1 resonance establish Vesta as a dynamically viable source for eucrite, diogenite, and howardite meteorites.
Constraints on the role of impact heating and melting in asteroids
Abstract— Imaging of asteroids Gaspra and Ida and laboratory studies of asteroidal meteorites show that impacts undoubtedly played an important role in the histories of asteroids and resulted in
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