NIRSpec Performances

The current best knowledge of NIRSpec's key performance parameters are given below.

Spectral Resolution

The spectral resolution that NIRSpec can offer depends on the chosen disperser and the wavelength. The resolution is ~1000 for the medium resolution gratings, ~2700 for the high resolution gratings, and 30 to 300 for the prism. Each spectral resolution element is sampled by two pixels.

The spectral resolution for the NIRSpec gratings (left) and the NIRSpec prism (right).