We have developed a spherically symmetric dynamical model of a dwarf spheroidal galaxy using the Schwarzschild method .
This type of modelling yields constraints both on the total mass distribution ( e.g .
enclosed mass and scale radius ) as well as on the orbital structure of the system modelled ( e.g .
velocity anisotropy ) .
Therefore not only can we derive the dark matter content of these systems , but also explore possible formation scenarios .
Here we present preliminary results for the Sculptor dSph .
We find that the mass of Sculptor within 1kpc is 8.5 \times 10 ^ { 7 \pm 0.05 } M _ { \odot } , its anisotropy profile is tangentially biased and slightly more isotropic near the center .
For an NFW profile , the preferred concentration ( \sim 15 ) is compatible with cosmological models .
Very cuspy density profiles ( steeper than NFW ) are strongly disfavoured for Sculptor .