Fine Guidance Sensor and Near Infrared Imager and Slitless Spectrograph

The Fine Guidance Sensor (FGS) and Near Infrared Imager and Slitless Spectrograph (NIRISS) are scientific instruments used in astrophysical observations, particularly aboard the James Webb Space Telescope (JWST). ### Fine Guidance Sensor (FGS) The Fine Guidance Sensor is designed primarily to provide precision pointing and stabilization for the JWST.