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Additional Dithers for Coordinated Parallel Observations

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Coordinated parallel observations with JWST allow for additional dithers optimized for the coordinated parallel pairing. This article provides a list of those dithers available in the Astronomer’s Proposal Tool (APT).

Dither tables

This page shows dither options available in APT.  For full dither offset (as well as pixel offset) see Coordinated Parallel Dither Tables.

The dither offsets are also maintained in the PRD in the following files:

MiriCompromiseDithers.txt (link to PRD)

NircamImagingCompromiseSubpixel.txt (link to PRD)

NirissCompromiseDithers.txt (link to PRD)

NirspecMosDithers.txt (link to PRD)

MIRI prime

  Table 2a. Additional Dithers for Parallel Observations with MIRI Prime

Prime + ParallelParameter

Values


MIRI Imaging + NIRCam Imaging

Dither Type

standard values




2-POINT-MIRI-F770W-WITH-NIRCam
3-POINT-MIRI-F770W-WITH-NIRCam
4-POINT-MIRI-F770W-WITH-NIRCam
9-POINT-MIRI-F770W-WITH-NIRCam




3-POINT-MIRI-F1000W-WITH-NIRCam
4-POINT-MIRI-F1000W-WITH-NIRCam




2-POINT-MIRI-F1280W-WITH-NIRCam
3-POINT-MIRI-F1280W-WITH-NIRCam
4-POINT-MIRI-F1280W-WITH-NIRCam
9-POINT-MIRI-F1280W-WITH-NIRCam




2-POINT-MIRI-F1500W-WITH-NIRCam
3-POINT-MIRI-F1500W-WITH-NIRCam
4-POINT-MIRI-F1500W-WITH-NIRCam
9-POINT-MIRI-F1500W-WITH-NIRCam




2-POINT-MIRI-F1800W-WITH-NIRCam
3-POINT-MIRI-F1800W-WITH-NIRCam
4-POINT-MIRI-F1800W-WITH-NIRCam




2-POINT-MIRI-F2100W-WITH-NIRCam
3-POINT-MIRI-F2100W-WITH-NIRCam
4-POINT-MIRI-F2100W-WITH-NIRCam
9-POINT-MIRI-F2100W-WITH-NIRCam




2-POINT-MIRI-F2550W-WITH-NIRCam
3-POINT-MIRI-F2550W-WITH-NIRCam
4-POINT-MIRI-F2550W-WITH-NIRCam
9-POINT-MIRI-F2550W-WITH-NIRCam






MIRI Imaging + NIRISS WFSS

Dither Type

 standard values




2-POINT-MIRI-F560W-WITH-NIRISS




3-POINT-MIRI-F770W-WITH-NIRISS
4-POINT-MIRI-F770W-WITH-NIRISS
9-POINT-MIRI-F770W-WITH-NIRISS




3-POINT-MIRI-F1000W-WITH-NIRISS
4-POINT-MIRI-F1000W-WITH-NIRISS
9-POINT-MIRI-F1000W-WITH-NIRISS




2-POINT-MIRI-F1280W-WITH-NIRISS
3-POINT-MIRI-F1280W-WITH-NIRISS
4-POINT-MIRI-F1280W-WITH-NIRISS
9-POINT-MIRI-F1280W-WITH-NIRISS




3-POINT-MIRI-F1500W-WITH-NIRISS
4-POINT-MIRI-F1500W-WITH-NIRISS




2-POINT-MIRI-F1800W-WITH-NIRISS
3-POINT-MIRI-F1800W-WITH-NIRISS
4-POINT-MIRI-F1800W-WITH-NIRISS
9-POINT-MIRI-F1800W-WITH-NIRISS




2-POINT-MIRI-F2100W-WITH-NIRISS
3-POINT-MIRI-F2100W-WITH-NIRISS
4-POINT-MIRI-F2100W-WITH-NIRISS




2-POINT-MIRI-F2550W-WITH-NIRISS
3-POINT-MIRI-F2550W-WITH-NIRISS
4-POINT-MIRI-F2550W-WITH-NIRISS
9-POINT-MIRI-F2550W-WITH-NIRISS


NIRCam prime

Table 2b. Additional Dithers for Parallel Observations with NIRCam Prime

Prime + ParallelParameterValues

NIRCam Imaging + MIRI Imaging

Subpixel Dither Type

NIRCam Only



3-POINT-WITH-MIRI-F560W
4-POINT-WITH-MIRI-F560W



2-POINT-WITH-MIRI-F770W
3-POINT-WITH-MIRI-F770W
4-POINT-WITH-MIRI-F770W
9-POINT-WITH-MIRI-F770W



2-POINT-WITH-MIRI-F1000W
3-POINT-WITH-MIRI-F1000W
4-POINT-WITH-MIRI-F1000W
9-POINT-WITH-MIRI-F1000W



2-POINT-WITH-MIRI-F1280W
3-POINT-WITH-MIRI-F1280W
4-POINT-WITH-MIRI-F1280W



2-POINT-WITH-MIRI-F1500W
3-POINT-WITH-MIRI-F1500W
4-POINT-WITH-MIRI-F1500W
9-POINT-WITH-MIRI-F1500W



2-POINT-WITH-MIRI-F1800W
3-POINT-WITH-MIRI-F1800W
4-POINT-WITH-MIRI-F1800W
9-POINT-WITH-MIRI-F1800W



2-POINT-WITH-MIRI-F2100W
3-POINT-WITH-MIRI-F2100W
4-POINT-WITH-MIRI-F2100W
9-POINT-WITH-MIRI-F2100W



2-POINT-WITH-MIRI-F2550W
3-POINT-WITH-MIRI-F2550W
4-POINT-WITH-MIRI-F2550W


NIRCAM Positions

(only appears for choice NIRCam Only)

standard values

NIRCam Imaging + NIRISS Imaging

Subpixel Dither Type

NIRCam Only



2-POINT-LARGE-WITH-NIRISS
2-POINT-MEDIUM-WITH-NIRISS



3-POINT-LARGE-WITH-NIRISS
3-POINT-MEDIUM-WITH-NIRISS
3-POINT-SMALL-WITH-NIRISS



4-POINT-LARGE-WITH-NIRISS
4-POINT-MEDIUM-WITH-NIRISS
4-POINT-SMALL-WITH-NIRISS



9-POINT-LARGE-WITH-NIRISS
9-POINT-MEDIUM-WITH-NIRISS


NIRCAM Positions

(only appears for choice NIRCam Only)

standard values

NIRCam Imaging + NIRISS WFSS

Subpixel Dither Type

NIRCam Only



2-POINT-LARGE-WITH-NIRISS
2-POINT-MEDIUM-WITH-NIRISS



3-POINT-LARGE-WITH-NIRISS
3-POINT-MEDIUM-WITH-NIRISS
3-POINT-SMALL-WITH-NIRISS



4-POINT-LARGE-WITH-NIRISS
4-POINT-MEDIUM-WITH-NIRISS
4-POINT-SMALL-WITH-NIRISS



9-POINT-LARGE-WITH-NIRISS
9-POINT-MEDIUM-WITH-NIRISS


NIRCAM Positions

(only appears for choice NIRCam Only)

standard values
NIRCam WFSS + NIRISS ImagingSubpixel Dither Type4-POINT
9-POINT
NONE


2-POINT-LARGE-WITH-NIRISS
2-POINT-MEDIUM-WITH-NIRISS


3-POINT-LARGE-WITH-NIRISS
3-POINT-MEDIUM-WITH-NIRISS
3-POINT-SMALL-WITH-NIRISS


4-POINT-LARGE-WITH-NIRISS
4-POINT-MEDIUM-WITH-NIRISS
4-POINT-SMALL-WITH-NIRISS


9-POINT-LARGE-WITH-NIRISS
9-POINT-MEDIUM-WITH-NIRISS
NIRCam WFSS + MIRI ImagingSubpixel Dither Type

4-POINT
9-POINT
NONE



3-POINT-WITH-MIRI-F560W
4-POINT-WITH-MIRI-F560W



2-POINT-WITH-MIRI-F770W
3-POINT-WITH-MIRI-F770W
4-POINT-WITH-MIRI-F770W
9-POINT-WITH-MIRI-F770W



2-POINT-WITH-MIRI-F1000W
3-POINT-WITH-MIRI-F1000W
4-POINT-WITH-MIRI-F1000W
9-POINT-WITH-MIRI-F1000W



2-POINT-WITH-MIRI-F1280W
3-POINT-WITH-MIRI-F1280W
4-POINT-WITH-MIRI-F1280W



2-POINT-WITH-MIRI-F1500W
3-POINT-WITH-MIRI-F1500W
4-POINT-WITH-MIRI-F1500W
9-POINT-WITH-MIRI-F1500W



2-POINT-WITH-MIRI-F1800W
3-POINT-WITH-MIRI-F1800W
4-POINT-WITH-MIRI-F1800W
9-POINT-WITH-MIRI-F1800W



2-POINT-WITH-MIRI-F2100W
3-POINT-WITH-MIRI-F2100W
4-POINT-WITH-MIRI-F2100W
9-POINT-WITH-MIRI-F2100W



2-POINT-WITH-MIRI-F2550W
3-POINT-WITH-MIRI-F2550W
4-POINT-WITH-MIRI-F2550W

NIRSpec prime

Table 2c. Additional Dithers for Parallel Observations with NIRSpec Prime

Prime + ParallelParameterValues

NIRSpec MOS + NIRCam Imaging

Dither Type

NONE



2-POINT-WITH-NIRCam-SIZE1
2-POINT-WITH-NIRCam-SIZE2
2-POINT-WITH-NIRCam-SIZE3



3-POINT-WITH-NIRCam-SIZE1
3-POINT-WITH-NIRCam-SIZE2
3-POINT-WITH-NIRCam-SIZE3

NIRISS prime

Table 2d. Additional Dithers for Parallel Observations with NIRISS Prime

Prime + ParallelParameterValues

NIRISS WFSS + MIRI Imaging

Dither

2-POINT-MIRI-F560W
3-POINT-MIRI-F560W



3-POINT-MIRI-F770W
9-POINT-MIRI-F770W



2-POINT-MIRI-F1000W
3-POINT-MIRI-F1000W
4-POINT-MIRI-F1000W



2-POINT-MIRI-F1280W
3-POINT-MIRI-F1280W
4-POINT-MIRI-F1280W
9-POINT-MIRI-F1280W



2-POINT-MIRI-F1500W
3-POINT-MIRI-F1500W
4-POINT-MIRI-F1500W
9-POINT-MIRI-F1500W



2-POINT-MIRI-F1800W
3-POINT-MIRI-F1800W
4-POINT-MIRI-F1800W
9-POINT-MIRI-F1800W



2-POINT-MIRI-F2100W
3-POINT-MIRI-F2100W
4-POINT-MIRI-F2100W
9-POINT-MIRI-F2100W



2-POINT-MIRI-F2550W
3-POINT-MIRI-F2550W
4-POINT-MIRI-F2550W
9-POINT-MIRI-F2550W



standard values

NIRISS WFSS + NIRCam Imaging

Dither

2-POINT-LARGE-WITH-NIRCam
2-POINT-MEDIUM-WITH-NIRCam



3-POINT-LARGE-WITH-NIRCam
3-POINT-MEDIUM-WITH-NIRCam
3-POINT-SMALL-WITH-NIRCam



4-POINT-LARGE-WITH-NIRCam
4-POINT-MEDIUM-WITH-NIRCam
4-POINT-SMALL-WITH-NIRCam



9-POINT-LARGE-WITH-NIRCam
9-POINT-MEDIUM-WITH-NIRCam
9-POINT-MEDIUM-WITH-NIRCam



 standard values 

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