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JWST NIRISS operations include telescope pointing maneuvers (dithers and target acquisitions) using targetable areas called apertures.

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NIRISS operations are observatory-level capabilities applied for science observations with NIRISS. These operations include pointing maneuvers such as dithers and target acquisitions.

  • Dithers are performed between exposures to improve sky coverage and image quality. Dithers are required for the Wide Field Slitless Spectroscopy (WFSS) mode to mitigate the poor sampling of the point spread function in that mode. Dithering is also supported (albeit discouraged) for the Aperture Masking Interferometry (AMI) mode. Dithering is not supported for the Single Object Slitless Spectroscopy (SOSS) mode.
  • Target Acquisition (TA) is required when using a subarray in SOSS and AMI observing modes, and it is strongly encouraged in those modes even when using full frame readout. TA is not implemented for WFSS.
  • All targeting is performed using apertures, which define the target's position and extent in the field of view of the detector. 

Detector operations such as readout patterns are covered in the articles under NIRISS detector.

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Related links

NIRISS Overview
NIRISS Dithers
NIRISS Target Acquisition
NIRISS Detector
Creating a NIRISS Observing Program
JWST User Documentation Home

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References

JWST technical documents

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Last updated

Published July 11, 2017


 

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Published March 02, 2017


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UpdatedJuly 11, 2017
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TeamNIRISS 
AuthorRavindranath, Goudfrooij, La Massa 
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UpdatedJuly 11, 2017
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