Computer Science
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..761r&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.761
Computer Science
Scientific paper
In this study, we construct models of the mass distribution inside Phobos. We explore the possible internal mass distributions, considering three kinds of material inside Phobos: rock, porous-rock and water-ice. We compute the principal moments of inertia, related to the second-order gravity field coefficients, C20 and C22, and libration amplitude of Phobos, for each of these possible internal mass distribution. Then, we select the distributions that fit the measured libration of amplitude and the density of Phobos within their error bars. For those distributions, we find values of the gravity field coefficients which departs from the expected value of a homogeneous mass distribution for a large amount of porosity and a low amount of waterice. In turn, precise measurements of both gravity field coefficients and rotation variations of Phobos may provide new constraints on the origin of this small moon of Mars.
Dehant Véronique
Rambaux Nicolas
Rivoldini Attilio
Rosenblatt Pascal
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