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James Webb Space Telescope
Near-InfraRed Imager and Slitless Spectrograph

NIRISSA science instrument known as the Near-InfraRed Imager and Slitless Spectrograph (NIRISS) is packaged with the guide camera (FGS), but is functionally independent. The NIRISS will be capable of wide-field grism spectroscopy with R~150 between 1.0 – 2.5 microns; single-object grism spectroscopy with R~700 between 0.6 – 3.0 microns; aperture-masking interferometry with a non-redundant mask (NRM) between 3.8 - 4.8 µm; and broad-band imaging across its 2.2' x 2.2' field between 1.0 - 5.0 µm. NIRISS is expected to contribute to all of the JWST Science Themes: 1) The End of the Dark Ages: First Light and Reionization; 2) The Assembly of Galaxies; 3) The Birth of Stars and Protoplanetary Systems; and 4) Planetary Systems and the Origin of Life.

The Canadian Space Agency is providing the NIRISS to the JWST Project. The prime contractor is Com Dev. The Principal Investigator for the NIRISS is René Doyon from the Université de Montréal.

Latest News

2015 August 27
Preparations for the third cryo-vacuum test (CV3) of the Integrated Science Instrument Module (ISIM) at NASA’s Goddard Space Flight Center continued throughout the summer. For the first time, the flight configuration of the ISIM was vigorously shaken – not stirred! – and bombarded by intense acoustical waves to simulate the harsh conditions of launch. Both NIRISS and FGS sailed through their “system functional tests” before and after these perturbations with no issues. Additional tests to confirm the electromagnetic compatibility of the subsystems of ISIM under conditions that simulate normal operations were also completed successfully. Now that the robustness of the ISIM has been demonstrated, it’s “full speed ahead” for the beginning of CV3 in late October!

2015 February 12
FGS/NIRISS became the first instrument to be reinstalled in the Integrated Science Instrument Module (ISIM) following the "Half-Time Show." All the planned hardware changes were successfully completed and both instruments passed their electronic check-outs at room temperature with flying colors. FGS/NIRISS is ready for the final series of tests at NASA's Goddard Space Flight Center!

NIRISS at GSFC cleanroom

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