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About

N. Zacharias is a leading astrometrist whose career has been defined by building the foundational reference catalogs that underpin modern precision astronomy. His primary research areas are astrometric survey design, stellar parallax measurement, and the creation of dense, all-sky reference frames. Zacharias’s major contribution is his leadership in developing the U.S. Naval Observatory’s CCD Astrograph Catalog (UCAC) and its successor, the URAT (Robotic Astrometric Telescope) project. These efforts have produced highly accurate, ground-based catalogs—such as the UCAC all-sky survey and the URAT1 catalog—providing critical positions and proper motions for millions of stars down to 16th magnitude. His most cited work, the 2018 “URAT South Parallax Results” (22 citations), presents trigonometric parallaxes for 916 newly discovered nearby stars, directly impacting studies of the solar neighborhood. Zacharias’s work is instrumental for calibrating large telescopes and for linking ground-based observations to the International Celestial Reference System, making him a key figure in the infrastructure of modern astrophysics.