Matthews et al present proper motions for young stars at the Galactic Center

Lu, J. R. and Ghez, A. M. and Hornstein, S. D. and Morris, M. and Matthews, K. and Thompson, D. J. and Becklin, E. E. (2006)
Galactic Center Youth: Orbits and Origins of the Young Stars in the Central Parsec. Journal of Physics: Conference Series, 54: 279-287, 2006. CaltechAuthors