NIRCam Observing Modes


JWST Near Infrared Camera (NIRCam) has five observing modes: imaging, coronagraphygrism wide field slitless spectroscopy, time-series imaging, and grism time series.

Overview of NIRCam observing modes

NIRCam has five observing modes for science, from 0.6 to 5.0 µm, with corresponding templates in the Astronomer's Proposal Tool (APT):

  • Imaging of two 2.2' × 2.2' fields separated by 44" covering 9.7 arcmin² in total

Simultaneous observations of the same field of view are available in the short wavelength channel (0.6–2.3 µm) and long wavelength channel (2.4–5.0 µm). 


Table 1. Properties of NIRCam observing modes

Observing mode

Wavelength
coverage
(µm)

Field of view1

Pixel 
scale
(arcsec/pix)

Notes

Imaging

0.6–2.3

2 × 132" × 132"
(44" and 5" gaps)

0.031FWHM 2 pix
at 2.0 µm
2.4–5.0

2 × 129" × 129"
(48" gap) 

0.063FWHM 2 pix
at 4.0 µm

Coronagraphic
imaging

1.8–2.2 
2.8–5.0 

20" × 20"

0.031
0.063

Wide field
slitless spectroscopy
2.4–5.0 2 × 129" × 129"0.063R ~ 1,600
Time-series imaging0.6–2.3 
2.4–5.0

129" × 129";
132" × 132"

0.031
0.063

Grism time series2.4–5.0129" × 129"0.063R ~ 1,600

1 Smaller fields of view are available using subarrays in the imaging, time series imaging, and grism time series modes.



Last updated

Updated January 16, 2018

  • Updated grism resolution


Updated July 13, 2017

  • Updated pixel scale values


Published December 30, 2016