VLBA Astrometry of Spacecraft: the Phoenix Mars Lander Experiment Dhawan, V. ; Fomalont, E. ; Romney, J. ; Brisken, W. ; Walker, R. ; Benson, J. ; Martin-Mur, T. J. ; Border, J. Abstract Publication: New Science Enabled by Microarcsecond Astrometry Pub Date: July 2009 Bibcode: 2009nsem.confP..12D