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JP-3889: Explain how source position is computed in source catalog step docs #9656

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Merged
merged 5 commits into from
Jul 21, 2025
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JP-3889: Explain how source position is computed in source catalog step docs #9656

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db7c70e
Add source position disclaimer to the docs
emolter Jul 16, 2025
5ddd478
Add link to relevant photutils docs
emolter Jul 17, 2025
b80e0ac
Merge branch 'main' of https://github.com/spacetelescope/jwst into JP…
emolter Jul 17, 2025
ad552ad
Update docs/jwst/source_catalog/main.rst
emolter Jul 21, 2025
38b6d81
Merge branch 'main' into JP-3889
melanieclarke Jul 21, 2025
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10 changes: 10 additions & 0 deletions docs/jwst/source_catalog/main.rst
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Expand Up @@ -96,6 +96,16 @@ Photometric errors are calculated from the resampled total-error
array contained in the ``ERR`` (``model.err``) array. Note that this
total-error array includes source Poisson noise.

Source Position
---------------
The source centroid is computed as the center of mass of the unmasked pixels
within the source segment (see
`photutils SourceCatalog <https://photutils.readthedocs.io/en/stable/api/photutils.segmentation.SourceCatalog.html>`_
for details). As such, the centroid depends on the source morphology,
the parameters passed to the segmentation algorithm, and the local background
noise properties. This also makes the uncertainty in the centroid position
difficult to estimate, and a formal error estimate is not provided by the step.

Output Products
---------------

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