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16950 results

Page 46 of 848

Vesta and Ceres
  • Insights from the Dawn Mission for the Origin of the Solar System
  • Edited by Simone Marchi, Carol A. Raymond, Christopher T. Russell
  • Published online:
    01 April 2022
    Print publication:
    31 March 2022
  • The NASA Dawn mission, launched in 2007, aimed to visit two of the most massive protoplanets of the main asteroid belt: Vesta and Ceres. The aim was to further our understanding of the earliest days of the Solar System, and compare the two bodies to better understand their formation and evolution. This book summarises state-of-the-art results from the mission, and discusses the implications for our understanding not only of the asteroid belt but the entire Solar System. It comprises of three parts: Part 1 provides an overview of the main belt asteroids and provides an introduction to the Dawn mission; Part 2 presents key findings from the mission; and Part 3 discusses how these findings provide insights into the formation and evolution of the Solar System. This is a definitive reference for academic researchers and professionals of planetary science, asteroid science and space exploration.

  • 16 - Collisional Evolution of the Main Belt as Recorded by Vesta

  • from Part III - Implications for the Formation and Evolution of the Solar System
  • Edited by Simone Marchi, Southwest Research Institute, Boulder, Colorado, Carol A. Raymond, California Institute of Technology, Christopher T. Russell, University of California, Los Angeles
  • Book:
    Vesta and Ceres
    Published online:
    01 April 2022
    Print publication:
    31 March 2022, pp 250-261

  • Summary

    Vesta’s surface is dominated by two overlapping impact basins: the older ~400 km Veneneia basin and the younger ~500 km diameter Rheasilvia basin.Their age and nature, along with the ejecta they produced in the form of V-type asteroids, can help us probe Vesta’s evolution.By modeling the production of craters superposed on these basins or on features created by their formation, we predict Veneneia and Rheasilvia basins are 3.2–3.5 Ga and ~1 Ga, respectively. Numerical models indicate they were created by the impact of ~60–70 km projectiles. These impacts likely dredged up material formed at >50 km depths within Vesta. The evidence for the formation time of Veneneia and Rheasilvia in the eucrite and howardite meteorite record exists but is limited. The absence of an obvious spike of 40Ar/39Ar shock degassing ages may be a consequence of low Main Belt impact velocities (< 5 km/s). Most V-type asteroids in the inner main belt are ejecta from one of these two basins. The scattered and limited population of V-types in the central and outer main belt have no clear source. We postulate they are fragments from Vesta-like bodies that originally formed in the terrestrial planet region.

  • 17 - Epilogue

  • from Part III - Implications for the Formation and Evolution of the Solar System
  • Edited by Simone Marchi, Southwest Research Institute, Boulder, Colorado, Carol A. Raymond, California Institute of Technology, Christopher T. Russell, University of California, Los Angeles
  • Book:
    Vesta and Ceres
    Published online:
    01 April 2022
    Print publication:
    31 March 2022, pp 262-264

  • Summary

    This book depicts a vivid and vibrant image of modern Main Belt asteroid science. In the last decade, thanks to the exploration by the NASA Dawn mission and the advent of high-resolution Earth-bound observations, we have entered a renaissance of Main Belt asteroid science. Formation theories, dynamical models, meteorite geochemical data, remote and in-situ observations synergistically show asteroids are leftover building blocks of planetary formation and tracers of important evolutionary processes (e.g., collisions, orbital migration) that have shaped the evolution of the early Solar System. Planned missions such as NASA’s Lucy and Psyche (scheduled to launch in 2021 and 2022) will surely provide additional colorful strokes to our ever-evolving portrait of the Main Belt.

Page 46 of 848