We present absolute parallaxes and proper motions for seven members of the Hyades open cluster , pre-selected to lie in the core of the cluster . Our data come from archival astrometric data from FGS 3 , and newer data for 3 Hyads from FGS 1R , both white-light interferometers on the Hubble Space Telescope ( HST ) . We obtain member parallaxes from six individual Fine Guidance Sensor ( FGS ) fields and use the field containing van Altena 622 and van Altena 627 ( = HIP 21138 ) as an example . Proper motions , spectral classifications and VJHK photometry of the stars comprising the astrometric reference frames provide spectrophotometric estimates of reference star absolute parallaxes . Introducing these into our model as observations with error , we determine absolute parallaxes for each Hyad . The parallax of vA 627 is significantly improved by including a perturbation orbit for this previously known spectroscopic binary , now an astrometric binary . Compared to our original ( 1997 ) determinations , a combination of new data , updated calibration , and improved analysis lowered the individual parallax errors by an average factor of 4.5 . Comparing parallaxes of the four stars contained in the Hipparcos catalog , we obtain an average factor of 11 times improvement with the HST . With these new results , we also have better agreement with Hipparcos for the four stars in common . These new parallaxes provide an average distance for these seven members , < { D } > = 47.5 pc , for the core a \pm 1 - \sigma dispersion depth of 3.6 pc , and a minimum depth from individual components of 16.0 \pm 0.9 pc . Absolute magnitudes for each member are compared to established main sequences , with excellent agreement . We obtain a weighted average distance modulus for the core of the Hyades of m-M=3.376 \pm 0.01 , a value close to the previous Hipparcos values , m-M=3.33 \pm 0.02 .