 Her research interests include extrasolar planets—Sackett was an innovative user of gravitational microlensing to search for extrasolar planets—dark matter and galactic structure.In 2006, Sackett was one of a team of 73 astronomers from 31 institutions in 12 countries that discovered OGLE-2005-BLG-390Lb, a small, cool planet orbiting a star in the inner Milky Way.Sackett is an Elected International Fellow of the Royal Astronomical Society and a board member of the Association of Universities for Research in Astronomy.