Additional Dithers for Coordinated Parallel Observations

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) 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

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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