Stellar Orbits in the Central Parsec

Astrometric positions and orbital fits for 8 stars, within the central 0."8 0."8 of the Galaxy, that show significant deviation from linear motion. The proper motion measurements were obtained at the Keck telescopes between 1995 and 2003, have uncertainties that are comparable to the size of the points, and are plotted in the reference frame in which the central dark mass is at rest. Overlaid are the best fitting simultaneous orbital solutions, which assume that all the stars are orbiting the same central point mass. The orbital solutions for the three stars that constrain the properties of the central dark object are delineated by solid lines and the joint orbital solutions for the remaining stars are shown with dashed lines.

References and Credit:
Stellar Orbits paper