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s Fine Guidance Sensor Gets Lots of Guidance" width="1023" height="681" />
FGS is a guider that locks on to bright stars in deep space to keep Webb on target creating sharp high quality images.
FGS allows Webb to determine its position, locate its celestial targets, track moving targets and remain steadily locked or pointed with very high precision on a specific celestial target.
FGS is so sensitive that it can detect a tiny angular displacement equivalent to the thickness of a human hair as seen from one kilometre away.
NIRISS enables scientists to determine the composition of exoplanets' atmospheres, observe distant galaxies, and examine objects that are very close together.
FGS/NIRISS operates over a wavelength range of 0.8 to 5.0 microns
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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 is 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.
