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The MOdified Newtonian Dynamics (MOND) is an attempt to modify thegravitation theory to solve the Dark Matter problem. This phenomenology is verysuccessful at the galactic level. The main effect produced by MOND in the SolarSystem is called the External Field Effect parametrized by the parameter $Q_2$.We have used 9 years of Cassini range and Doppler measurements to constrain$Q_2$. Our estimate of this parameter based on Cassini data is given by $Q_2=(3\pm 3)\times 10^{-27} \ \rm{s^{-2}}$ which shows no deviation from GeneralRelativity and excludes a large part of the relativistic MOND theories. Thislimit can also be interpreted as a limit on a external tidal potential actingon the Solar System coming from the internal mass of our galaxy (including DarkMatter) or from a new hypothetical body.

Constraints on MOND theory from radio tracking data of the Cassini spacecraft