EXPRES

{{Short description|American astronomical instrument}}

{{about|the astronomical instrument|the newspaper|Expres{{!}}Expres||Expres (disambiguation)}}

The EXtreme PREcision Spectrograph (EXPRES) is an optical fiber fed echelle instrument designed and built at the Yale Exoplanet Laboratory to be installed on the 4.3-meter Lowell Discovery Telescope operated by Lowell Observatory. It has a goal to achieve 10 cm/s radial velocity precision. It uses a laser frequency comb to calibrate the primary wavelength for EXPRES.{{ArXiv|1606.04413}} EXPRES: A Next Generation RV Spectrograph in the Search for Earth-like Worlds