MIRI LRS Dithering
The JWST MIRI low-resolution spectroscopy mode provides dither templates for both point and extended sources.
Dithering for low-resolution spectroscopy
Dithering is possible for MIRI low-resolution spectroscopy (LRS) slit observations only. (It is disabled in the slitless mode). Dithers can mitigate the effects of bad pixels, and obtain subpixel sampling and background observations.
Two dither patterns will be offered in this mode:
ALONG SLIT NOD1 is designed for compact sources, and uses a 2-point "nod" where a point source is dithered between positions that are located approximately 30% and 70% of the way along the slit direction.
MAPPING has a customizable number of slit positions and offsets in the slit-parallel and slit-perpendicular directions, allowing users to ensure that a source is well-mapped and that sufficient background data is obtained.
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Gordon , K. et al. 2015, PASP, 127, 953
The Mid-Infrared Instrument for the James Webb Space Telescope, X: Operations and Data Reduction