Euclid Near Infrared Spectrometer and Photometer instrument flight model presentation, performance, and ground calibration results summary

The NISP (Near Infrared Spectrometer and Photometer) is one of the two Euclid instruments (see ref [1]). It operates in the near-IR spectral region (950 -2020nm) as a photometer and spectrometer. The instrument is composed of: - a cold (135 K) optomechanical subsystem consisting of a Silicon carbide structure, an optical assembly, a filter wheel mechanism, a grism wheel mechanism, a calibration unit, and a thermal control system, - a detection system based on a mosaic of 16 H2RG with their front-end readout electronic, and - a warm electronic system (290 K) composed of a data processing / detector control unit and of an instrument control unit that interfaces with the spacecraft via a 1553 bus for command and control and via Spacewire links for science data. This paper presents: - the final architecture of the flight model instrument and subsystems, and - the performance and the ground calibration measurement done at NISP level and at Euclid Payload Module level at operational cold temperature.