What we do
We use the Fine Guidance Sensors aboard Hubble Space Telescope to measure star positions and study binary stars unresolvable using ground-based techniques. The Fine Guidance Sensors provide per-observation relative positions with 0.001 arc second angular precsion. Stellar positions yield information on distance (parallax) and possible faint companions. The orbits of binary stars yield stellar masses.
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What we've done
Here are our papers organized by topic. We've provided a beautiful cover for the Astronomical Journal. We also developed software (available to all) to aid us in our analyses.