Fine Guidance Sensor/Near InfraRed Imager and Slitless Spectrograph (FGS/NIRISS)
The Fine Guidance Sensor (FGS) allows Webb to point precisely, so that it can obtain high-quality images. The Near Infrared Imager and Slitless Spectrograph part of the FGS/NIRISS will be used to investigate the following science objectives: first light detection, exoplanet detection and characterization, and exoplanet transit spectroscopy.
FGS/NIRISS has a wavelength range of 0.8 to 5.0 microns, and is a specialized instrument with three main modes, each of which addresses a separate wavelength range. FGS is a "guider," which helps point the telescope.
The FGS/NIRISS at NASA Goddard before integration into the instrument module.
The integrated instrument module:
FGS/NIRISS is being built by the Canadian Space Agency.
Links & Resources:
- The Space Telescope Science Institute has a technical page on the FGS: http://www.stsci.edu/ngst/instruments/fgs/
- The Space Telescope Science Institute has a technical page on the NIRISS: http://www.stsci.edu/jwst/instruments/niriss
- Our page about the detectors in our instruments
- Archive of Images of FGS/NIRISS