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Browsing by Author "Prettyman, Thomas H."

Browsing by Author "Prettyman, Thomas H."

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  • Asteroid (4) Vesta II: Exploring a geologically and geochemically complex world with the Dawn Mission 
    McCoy, Timothy J.; Beck, Andrew W.; Prettyman, Thomas H.; Mittlefehldt, David W. (2015)
    More than 200 years after its discovery, asteroid (4) Vesta is thought to be the parent body for the howardite, eucrite and diogenite (HED) meteorites. The Dawn spacecraft spent ~14 months in orbit around this largest, ...
  • Composition of the Rheasilvia basin, a window into Vesta's interior 
    McSween, Harry Y.; Ammannito, Eleonora; Reddy, Vishnu; Prettyman, Thomas H.; Beck, Andrew W.; De Sanctis, M. Cristina; Nathues, Andreas; Le Corre, Lucille; O'Brien, David P.; Yamashita, Naoyuki; McCoy, Timothy J.; Mittlefehldt, David W.; Toplis, Michael J.; Schenk, Paul; Palomba, Ernesto; Turrini, Diego; Tosi, Federico; Zambon, Francesca; Longobardo, Andrea; Capaccioni, Fabrizio; Raymond, Carol A.; Russell, Christopher T. (2013)
    The estimated excavation depth of the huge Rheasilvia impact basin is nearly twice the likely thickness of the Vestan basaltic crust, so the mantle should be exposed. Spectral mapping by the Dawn spacecraft reveals ...
  • Compositional variability on the surface of 4 Vesta revealed through GRaND measurements of high-energy gamma rays 
    Peplowski, Patrick N.; Lawrence, David J.; Prettyman, Thomas H.; Yamashita, Naoyuki; Bazell, Dave; Feldman, William C.; Le Corre, Lucille; McCoy, Timothy J.; Reddy, Vishnu; Reedy, Robert C.; Russell, Chris T.; Toplis, Michael J. (2013)
    Measurements of the high-energy gamma-ray flux emanating from asteroid 4 Vesta by the Dawn Gamma-Ray and Neutron Detector (GRaND) have revealed variability in the near-surface elemental composition of the Vestan surface. ...
  • Dawn; the Vesta-HED connection; and the geologic context for eucrites, diogenites, and howardites 
    McSween, Harry Y.; Binzel, Richard P.; de Sanctis, M. Cristina; Ammannito, Eleonora; Prettyman, Thomas H.; Beck, Andrew W.; Reddy, Vishnu; Le Corre, Lucille; Gaffey, Michael J.; McCord, Thomas B.; Raymond, Carol A.; Russell, Christopher T. (2013)
    The Dawn mission has provided new evidence strengthening the identification of asteroid Vesta as the parent body of the howardite, eucrite, and diogenite (HED) meteorites. The evidence includes Vesta's petrologic ...
  • Deciphering Redox State for a Metal-Rich World 
    McCoy, Timothy J.; Dibb, Steven D.; Peplowski, Patrick N.; Maurel, Clara; Bercovici, Hannah L.; Corrigan, Catherine M.; Bell, James F.; Weiss, Benjamin P.; Lawrence, David J.; Wenkert, Daniel D.; Prettyman, Thomas H.; Elkins-Tanton, Lindy (2022)
    The Psyche mission's Oxidation-Reduction Working Group is focused on understanding, determining, and applying the redox state of (16) Psyche to understand the origin of a metal-rich world. The oxidation-reduction state of ...
  • Distinguishing the Origin of Asteroid (16) Psyche 
    Elkins-Tanton, Linda; Asphaug, Erik; Bell, James F.; Bierson, Carver J.; Bills, Bruce G.; Bottke, William F.; Courville, Samuel W.; Dibb, Steven D.; Jun, Insoo; Lawrence, David J.; Marchi, Simone; McCoy, Timothy J.; Merayo, Jose M. G.; Oran, Rona; O'Rourke, Joseph G.; Park, Ryan S.; Peplowski, Patrick N.; Prettyman, Thomas H.; Raymond, Carol A.; Weiss, Benjamin P.; Wieczorek, Mark A.; Zuber, Maria T. (2022)
    The asteroid (16) Psyche may be the metal-rich remnant of a differentiated planetesimal, or it may be a highly reduced, metal-rich asteroidal material that never differentiated. The NASA Psyche mission aims to determine ...
  • Elemental Mapping by Dawn Reveals Exogenic H in Vesta's Regolith 
    Prettyman, Thomas H.; Mittlefehldt, David W.; Yamashita, Naoyuki; Lawrence, David J.; Beck, Andrew W.; Feldman, William C.; McCoy, Timothy J.; McSween, Harry Y.; Toplis, Michael J.; Titus, Timothy N.; Tricarico, Pasquale; Reedy, Robert C.; Hendricks, John S.; Forni, Olivier; Le Corre, Lucille; Li, Jian-Yang; Mizzon, Hugau; Reddy, Vishnu; Raymond, Carol A.; Russell, Christopher T. (2012)
    Using Dawn's Gamma Ray and Neutron Detector, we tested models of Vesta's evolution based on studies of howardite, eucrite, and diogenite (HED) meteorites. Global Fe/O and Fe/Si ratios are consistent with HED ...
  • Igneous lithologies on asteroid (4) Vesta mapped using gamma-ray and neutron data 
    Beck, Andrew W.; Lawrence, David J.; Peplowski, Patrick N.; Viviano-Beck, Christina; Prettyman, Thomas H.; McCoy, Timothy J.; McSween Jr, Harry Y.; Yamashita, Naoyuki (2017)
    We use data collected by the Dawn Gamma-Ray and Neutron Detector (GRaND) at Vesta to map compositions corresponding to nearly pure igneous lithologies in the howardite, eucrite, diogenite (HED) meteorite clan (samples ...
  • Neutron absorption constraints on the composition of 4 Vesta 
    Prettyman, Thomas H.; Mittlefehldt, David W.; Yamashita, Naoyuki; Beck, Andrew W.; Feldman, William C.; Hendricks, John S.; Lawrence, David J.; McCoy, Timothy J.; McSween, Harry Y.; Peplowski, Patrick N.; Reedy, Robert C.; Toplis, Michael J.; Le Corre, Lucille; Mizzon, Hugau; Reddy, Vishnu; Titus, Timothy N.; Raymond, Carol A.; Russell, Christopher T. (2013)
    Global maps of the macroscopic thermal neutron absorption cross section of Vesta's regolith by the Gamma Ray and Neutron Detector (GRaND) on board the NASA Dawn spacecraft provide constraints on the abundance and ...
  • Publisher Correction to: Deciphering Redox State for a Metal-Rich World 
    McCoy, Timothy J.; Dibb, Steven D.; Peplowski, Patrick N.; Maurel, Clara; Bercovici, Hannah L.; Corrigan, Catherine M.; Bell, James F.; Weiss, Benjamin P.; Lawrence, David J.; Wenkert, Daniel D.; Prettyman, Thomas H.; Elkins-Tanton, Lindy (2022)

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