NGC 288 is a diffuse Galactic globular cluster , it is remarkable in that its low density results in internal accelerations being below the critical MOND a _ { 0 } acceleration throughout .
This makes it an ideal testing ground for MONDian gravity , as the details of the largely unknown transition function between the Newtonian and modified regimes become unimportant .
Further , exact analytical solutions exist for isothermal spherical equilibrium structures in MOND , allowing for arbitrary values of the anisotropy parameter , \beta .
In this paper we use observations of the velocity dispersion profile of NGC 288 , which is in fact isothermal , as dynamical constraints on MONDian models for this cluster , where the remaining free parameters are adjusted to fit the observed surface brightness profile .
We find the optimal fit requires \beta = 0 , an isotropic solution with a total mass of 3.5 \pm 1.1 \times 10 ^ { 4 } M _ { \odot } .