1. M15 Remco van den Bosch Sterrewacht Leiden Tim de Zeeuw, Karl Gebhardt, Eva Noyola, Glenn van de Ven

2. Overview Orbit-based Schwarzschild models Combination of line-of-sight velocities and proper motions Allows to constrain distance, mass profile

3. Data Surface brightness profile from HST+ground 1556 stars with line-of-sight velocities –Gebhardt et al. (2000) 704 stars with proper motion velocities –McNamara et al. (2003)

8. Conclusions Distance of 10.3+/-0.8 kpc Total mass inside 0.03 pc is 2700 M  Central density of 10 7 M  /pc 3