The HARPS-N (acronym for High Accuracy Radial velocity Planet Searcher for the Northern hemisphere) spectrograph is a high-precision radial-velocity instrument, similar to HARPS on the ESO's 3.6m telescope in Chile. It is installed at the Italian 3.58m Telescopio Nazionale Galileo telescope on La Palma Island (Canary Islands). It allows for planetary research in the northern sky which hosts the Cygnus and Lyra constellations. In particular it allows for detailed follow up research to Kepler mission planet candidates, which are located in the Cygnus constellation region.
The main scientific rationale of HARPS-N is the characterization and discovery of terrestrial planets by combining transits and Doppler measurements.