PROJECT SITE:

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Official site of the design, build, test and launch of JWST.

NASA HQ SITE:

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Overview of the spacecraft, mission and science of JWST.

JWST related content on the NASA HOME PAGE plus links to NASA’s other great activities and missions.

MISSIONS:

JWST related Missions.

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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. 

Instrument wavelength ranges

The FGS/NIRISS at NASA Goddard before integration into the instrument module.

Webb Telescope's Fine Guidance Sensor Gets Lots of Guidance

The integrated instrument module:

JWST Team Photo with Completed Flight Instrument module

FGS

FGS/NIRISS is being built by the Canadian Space Agency.



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