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.
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)