  Bounds to the Nordtvedt parameter are obtained from the motion of the first
twelve Trojan asteroids in the period 1906-1990. From the analysis performed,
we derive a value for the inverse of the Saturn mass 3497.80 \pm 0.81 and the
Nordtvedt parameter -0.56 \pm 0.48, from a simultaneous solution for all
asteroids.
