Orbital Analysis of the HR 8799 Planetary System: Astrometric Characterization and Improvements

We present new results on the potential orbital configuration of the HR 8799 planetary system. New astrometric analysis of imaging data from NIRC2 on the Keck II telescope has allowed us to correct biases in the astrometry caused primarily by the camera's focal plane mask. Correcting these biases has significantly improved the orbit fits to our astrometry. We use these fits, along with other information uncovered in new 2010 datasets, to shed light on the stability of this system over long timescales. Portions of this work were performed

under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. This work is supported by the NASA Origins Program.