Abstract
The galactic orbits of six globular clusters have been numerically calculated in two different models for the galactic mass distribution, using recently determined absolute proper motions; both models give a good representation of the observed rotation curve in the region 1 to 15 kpc and a flat rotation curve out to 100 kpc. The orbits of three additional clusters with recent improved determinations of their distances and absolute proper motions have also been recalculated. With the pericentric distances resulting from the computed orbits, cluster tidal radii are determined, and these are compared with the observational values. The effects of observational errors upon the computed orbital parameters and tidal radii are evaluated. The differences found with both galactic models are also studied.
