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About

Joost Geelhoed is a key figure in astronomical instrumentation, specializing in the development of high-precision spectrographs for exoplanet discovery. His major contributions center on the design and construction of HARPS3, a state-of-the-art echelle spectrograph planned for the roboticized Isaac Newton Telescope. This instrument, with its high resolution (R≈115,000) and broad wavelength coverage (380–690 nm), is engineered to achieve exceptional radial velocity precision, enabling the detection of Earth-like planets around nearby stars. Geelhoed’s work on HARPS3, detailed in his most-cited paper (34 citations), directly supports the Terra Hunting Experiment, a long-term search for terrestrial exoplanets. His expertise in opto-mechanical design and system integration has been critical to advancing the sensitivity of ground-based exoplanet surveys. With a growing citation impact, Geelhoed’s contributions are helping to push the boundaries of our ability to find and characterize small, rocky worlds beyond our solar system, making him a vital contributor to the next generation of exoplanet science.