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The Castalia mission to Main Belt Comet 133P/Elst-Pizarro

C. Snodgrass 1 G.H. Jones H. Boehnhardt 2 A. Gibbings 3 M. Homeister 4 N. Andre P. Beck 5 M.S. Bentley 6 I. Bertini 7 N. Bowles 8 M.T. Capria 9 C. Carr 10 M. Ceriotti A.J. Coates 11 V. Della Corte 9 K.L. Donaldson Hanna A. Fitzsimmons 12 P.J. Gutiérrez O.R. Hainaut A. Herique 5 M. Hilchenbach 13 H.H. Hsieh E. Jehin 14 O. Karatekin 15 W. Kofman 5 L.M. Lara 16 K. Laudan J. Licandro 17 S.C. Lowry 18 F. Marzari 19 A. Masters 10 K.J. Meech F. Moreno 16 A. Morse R. Orosei 20 A. Pack D. Plettemeier 21 D. Prialnik 22 A. Rotundi 23 M. Rubin 24 J.P. Sanchez S. Sheridan M. Trieloff 25 A. Winterboer 
Abstract : We describe Castalia, a proposed mission to rendezvous with a Main Belt Comet (MBC), 133P/Elst-Pizarro. MBCs are a recently discovered population of apparently icy bodies within the main asteroid belt between Mars and Jupiter, which may represent the remnants of the population which supplied the early Earth with water. Castalia will perform the first exploration of this population by char-acterising 133P in detail, solving the puzzle of the MBC's activity, and making the first in situ measurements of water in the asteroid belt. In many ways a successor to ESA's highly successful Rosetta mission, Castalia will allow direct comparison between very different classes of comet, including measuring critical isotope ratios, plasma and dust properties. It will also feature the first radar system to visit a minor body, mapping the ice in the interior. Castalia was proposed, in slightly different versions, to the ESA M4 and M5 calls within the Cosmic Vision programme. We describe the science motivation for the mission, the measurements required to achieve the scientific goals, and the proposed instrument payload and spacecraft to achieve these.
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C. Snodgrass, G.H. Jones, H. Boehnhardt, A. Gibbings, M. Homeister, et al.. The Castalia mission to Main Belt Comet 133P/Elst-Pizarro. Advances in Space Research, 2018, 62 (8), pp.1947-1976. ⟨10.1016/j.asr.2017.09.011⟩. ⟨hal-02350051⟩



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