Mission Overview

mission wavelength

Wavelength Coverage

mission coverage

The JWST Near-Infrared Imager and Slitless Spectrograph (NIRISS) provides observing modes for slitless spectroscopy, high-contrast interferometric imaging, and imaging, over wavelengths between 0.6 and 5.0 μm. Although NIRISS is packaged with the Fine Guidance Sensor (FGS), the two instruments are functionally independent of each other.

Active From

Not yet launched.


Varies by Observing Mode:  see Table 1 for details: NIRISS Modes

  • Pixel Scale: ~0.065"/pixel
  • Resolution: ~150 (WFSS) ; ~700 (SOSS)
  • FWHM: ~2 pixels @ 3.4 um (imaging)


On this Page

Search Tools

MAST Portal

Search multiple missions using target names or coordinates.


Tools for programmatically querying the MAST Portal

Simulated Data

Simulated data from the NIRISS instrument team

Primary Documents

External Links