Assigned ID: 140 ----- Attempting Submission 2 (Thu Jan 25 19:20:25 GMT 2007) ----- We propose to measure the internal proper motions of the stars in M35 that are used to calibrate the HST/FGS. The goal of this effort is to remove the influence these stars have the FGS distortion map. Employing the approximately 108 orbits of available archival FGS data, these motions can be determined to an accuracy of 0.05 mas/year. By iteratively measuring these motions using successively longer time bases and then accounting for them in the distortion map, their influence on this map can be essentially eliminated.

HOT STARS 12 67000 see below true 0.0 false false false false false false SUPPORTED