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Dawn arrives at Ceres: Exploration of a small, volatile-rich world

Russell, C. T. and Raymond, C. A. and Konopliv, A. S. and Park, R. S. and Polanskey, C. and Rayman, M. D. and Castillo-Rogez, J. C. (2016) Dawn arrives at Ceres: Exploration of a small, volatile-rich world. Science, 353 (6303). pp. 1008-1010. ISSN 0036-8075. doi:10.1126/science.aaf4219.

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On 6 March 2015, Dawn arrived at Ceres to find a dark, desiccated surface punctuated by small, bright areas. Parts of Ceres’ surface are heavily cratered, but the largest expected craters are absent. Ceres appears gravitationally relaxed at only the longest wavelengths, implying a mechanically strong lithosphere with a weaker deep interior. Ceres’ dry exterior displays hydroxylated silicates, including ammoniated clays of endogenous origin. The possibility of abundant volatiles at depth is supported by geomorphologic features such as flat crater floors with pits, lobate flows of materials, and a singular mountain that appears to be an extrusive cryovolcanic dome. On one occasion, Ceres temporarily interacted with the solar wind, producing a bow shock accelerating electrons to energies of tens of kilovolts.

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Russell, C. T.0000-0003-1639-8298
Additional Information:© 2016 American Association for the Advancement of Science. Received for publication 4 February 2016; accepted for publication 13 July 2016. We thank the Dawn team for the development, cruise, orbital insertion, and operations of the Dawn spacecraft at Ceres. C.T.R. is supported by the Discovery Program through contract NNM05AA86C to the University of California, Los Angeles. R.R.F. thanks the Lamont-Doherty Earth Observatory Post-Doctoral Fellowship for support. A portion of this work was performed at the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA. Dawn's Gamma Ray and Neutron Detector is operated by the Planetary Science Institute under contract with the Jet Propulsion Laboratory, California Institute of Technology (JPL). Dawn data are archived with the NASA Planetary Data System. Framing camera data may be obtained at Spectral data from Visible and Infrared Mapping Spectrometer may be obtained at GRaND data may be obtained at
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Lamont-Doherty Earth ObservatoryUNSPECIFIED
Issue or Number:6303
Record Number:CaltechAUTHORS:20161010-170706364
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Official Citation:Russell, C. T. et al. Dawn arrives at Ceres: Exploration of a small, volatile-rich world. Science 02 Sep 2016: Vol. 353, Issue 6303, pp. 1008-1010 DOI: 10.1126/science.aaf4219
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:70981
Deposited By: Melissa Ray
Deposited On:12 Oct 2016 19:25
Last Modified:11 Nov 2021 04:38

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