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

(Launch dates TBD)

Resolution 

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)

Capabilities

On this Page

Search Tools

MAST Portal

Search multiple missions using target names or coordinates.

MAST API

Tools for programmatically querying the MAST Portal

Simulated Data

Simulated data from the NIRISS instrument team

Primary Documents

Image Gallery

JWST NIRISS Optical Path Diagram

(Image courtesy JDOX.)

JWST NIRISS CAD Diagram

(Image courtesy JDOX.)

JWST NIRISS In Development

NASA's Fine Guidance Sensor / Near-InfraRed Imager and Slitliss Spectrograph (FGS/NIRISS) is getting a lift in the giant clean room at NASA Goddard Space Flight Center in Greenbelt, MD.  In this photo, the FGS/NIRISS was being lifted for placement on a master tool for key measurements prior to installation onto its flight structure later.  (Image courtesy NASA/Chris Gunn.)

JWST NIRISS Testing

The flight model of the James Webb Space Telescope's Fine Guidance Sensor (FGS) undergoing cryogenic testing.  (Image courtesy NASA/COM DEV Canada.)

JWST NIRISS Arrival at NASA

The Canadian Space Agency's contribution to the Webb mission, the Fine Guidance Sensor/Near InfraRed Imager and Slitless Spectrograph (FGS/NIRISS) arrived at NASA Goddard Space Flight Center, Greenbelt, Md. on July 30, 2012.  (Image courtesy NASA.)

External Links