  We provide the first direct lifting of the mass/anisotropy degeneracy for a
cluster of galaxies, by jointly fitting the line of sight velocity dispersion
and kurtosis profiles of the Coma cluster, assuming an NFW tracer density
profile, a generalized-NFW dark matter profile and a constant anisotropy
profile. We find that the orbits in Coma must be quasi-isotropic, and find a
mass consistent with previous analyses, but a concentration parameter 50%
higher than expected in cosmological N-body simulations. We then test the
accuracy of our method on realistic non-spherical systems with substructure and
streaming motions, by applying it to the ten most massive structures in a
cosmological N-body simulation. We find that our method yields fairly accurate
results on average (within 20%), although with a wide variation (factor 1.7 at
1 sigma) for the concentration parameter, with decreased accuracy and
efficiency when the projected mean velocity is not constant with radius.
