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DAOFind + PSFPhotometry can conflict when masks are badly behaved #1802

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keflavich opened this issue Jul 8, 2024 · 0 comments
Open

DAOFind + PSFPhotometry can conflict when masks are badly behaved #1802

keflavich opened this issue Jul 8, 2024 · 0 comments
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@keflavich
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I got the following error:

ValueError: For one or more sources, the number of data points available to fit is less than the number of fit parameters. This could be due to a source(s) near the edge of the detector or if it has few unmasked pixels. Please check the input mask or source positions.

when using a mask for photometry. In this specific case, it's caused by this pixel:
image
(the background image is the boolean mask).

It would be a good idea to:

  • add a mechanism to reject daofind-found stars with too few unmasked pixels
  • skip such stars in fitting
  • and/or, document that islands smaller than the number of free parameters should be excluded from masks.
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@keflavich @larrybradley