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Observations of the separations of Hipparcos stars and extragalactic objects are being made with the Fine Guidance Sensors of the Hubble Space Telescope. The precisions obtained range from a milliarcsecond to several milliarcseconds. These observations will be used in conjunction with other observation types to tie the Hipparcos reference frame to an extragalactic reference frame at the submilliarcsecond level. Between April 1993 and February 1994, 27 good observations of pairs were obtained. The observations are continuing. The following will be discussed: a) the nature of the observations b) the number, distribution ,and precision of the observations c) the status of the calibrations d) the method of solution, and e) the overall accuracy expected from the observations available to the Hipparcos project.
