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Browsing by Author "Lawrence, D. J."

Browsing by Author "Lawrence, D. J."

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  • Dawn at Vesta: Testing the Protoplanetary Paradigm 
    Russell, C. T.; Raymond, C. A.; Coradini, A.; McSween, H. Y.; Zuber, M. T.; Nathues, A.; de Sanctis, M. C.; Jaumann, R.; Konopliv, A. S.; Preusker, F.; Asmar, S. W.; Park, R. S.; Gaskell, R.; Keller, H. U.; Mottola, S.; Roatsch, T.; Scully, J. E. C.; Smith, D. E.; Tricarico, P.; Toplis, M. J.; Christensen, U. R.; Feldman, W. C.; Lawrence, D. J.; McCoy, Timothy J.; Prettyman, T. H.; Reedy, R. C.; Sykes, M. E.; Titus, T. N. (2012)
    The Dawn spacecraft targeted 4 Vesta, believed to be a remnant intact protoplanet from the earliest epoch of solar system formation, based on analyses of howardite-eucrite-diogenite (HED) meteorites that indicate a ...
  • Distribution of iron on Vesta 
    Yamashita, N.; Prettyman, T. H.; Mittlefehldt, D. W.; Toplis, M. J.; McCoy, Timothy J.; Beck, Andrew W.; Reedy, R. C.; Feldman, W. C.; Lawrence, D. J.; Peplowski, P. N.; Forni, O.; Mizzon, H.; Raymond, C. A.; Russell, C. T. (2013)
    We have completed a mapping study of 7.6 MeV gamma rays produced by neutron capture by Fe at the surface of the main belt asteroid 4 Vesta as measured by the bismuth germanate scintillator of the Gamma Ray and Neutron ...
  • Observations, Meteorites, and Models: A Preflight Assessment of the Composition and Formation of (16) Psyche 
    Elkins-Tanton, L. T.; Asphaug, E.; Bell, J. F., III; Bercovici, H.; Bills, B.; Binzel, R.; Bottke, W. F.; Dibb, S.; Lawrence, D. J.; Marchi, S.; Mccoy, T. J.; Oran, R.; Park, R. S.; Peplowski, P. N.; Polanskey, C. A.; Prettyman, T. H.; Russell, C. T.; Schaefer, L.; Weiss, B. P.; Wieczorek, M. A.; Williams, D. A.; Zuber, M. T. (2020)
    Some years ago, the consensus was that asteroid (16) Psyche was almost entirely metal. New data on density, radar properties, and spectral signatures indicate that the asteroid is something perhaps even more enigmatic: a ...
  • Signatures of volatiles in the lunar proton albedo 
    Schwadron, N. A.; Wilson, J. K.; Looper, M. D.; Jordan, A. P.; Spence, H. E.; Blake, J. B.; Case, A. W.; Iwata, Y.; Kasper, J. C.; Farrell, W. M.; Lawrence, D. J.; Livadiotis, G.; Mazur, J.; Petro, N.; Pieters, C.; Robinson, M. S.; Smith, S.; Townsend, L. W.; Zeitlin, C. (2016)
    We find evidence for hydrated material in the lunar regolith using "albedo protons" measured with the Cosmic Ray Telescope for the Effects of Radiation (CRaTER) on the Lunar Reconnaissance Orbiter (LRO). Fluxes ...

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