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Determination of the Masses of Minor Planets

The observations of minor planets are of particular interest for determining a possible rotation between the Hipparcos and the dynamical reference frames. In order to evaluate it, Hipparcos data are compared to the values calculated from the equations of motion. The associated equations of condition involve in addition orbital elements and masses of minor planets. In this paper, we present the favourable conditions of the masses determinations (close approaches) and the selection of particular cases that is being done. We show with examples which precision it is possible to expect from the data of Hipparcos minor planets. The determination of other parameters involved in the condition equations is also discussed.