Mass and internal structure of Phobos from close flybys by Mars-Express

Details Mass and internal structure of Phobos from close flybys by Mars-Express Mass and internal structure of Phobos from close flybys by Mars-Express

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.g43a0802a&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #G43A-0802

Physics

1299 General Or Miscellaneous

Scientific paper

Several close encounters of Phobos by Mars Express spacecraft are scheduled for 2005. This will give us the opportunity to study its mass, internal structure and particularly the assumption of a constant density. Using the perturbations induced on MEX motion by Phobos irregular shape, one can fit its first gravitational coefficients as J2 and C22 and compare them with computed harmonics based on the shape and assumed constant density. We present a simulation of this method. A first software called GINS (primary developed by CNES) is used to represent MEX motion just before the close encounter. A second software has been developed to fit the Phobos gravitational potential, using the observed velocity perturbations on MEX. It is noteworthy that it will be the first direct observational derivation of Phobos' internal structure.

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