noao.digiphot.daophot

The daophot package is used to preform Dao crowded-field photometry.

Notes

For questions or comments please see our github page. We encourage and appreciate user feedback.

Large parts of the daophot functionality has been replaced in the astropy.photutils package.

We recommend looking at the photutils documentation to explore the new workflow. But if you are trying to achieve a specific subfunction of daophot, this notebook maybe be useful. The tasks are grouped together when they reference the same doumentation.

Contents:

allstar-peak-phot-psf

Please review the Notes section above before running any examples in this notebook

allstar - Group and fit psf to multiple stars simultaneously, with the initial esitmates of positions already provided.

peak - Fit the psf to single stars.

phot - Compute sky values and initial magnitudes for a list of stars use photometry call.

psf - Compute the point spread function.

daofind-nstar-substar

Please review the Notes section above before running any examples in this notebook

daofind - Find stars in an image using the DAO algorithm.

nstar - Fit the psf to predefined groups of stars.

substar - Subtract the fitted stars from the original image.

group-pstselect

Please review the Notes section above before running any examples in this notebook

group - Group stars based on positional overlap and signal/noise.

grpselect-pcalc-pconcat-pdump-pselect-psort

Please review the Notes section above before running any examples in this notebook

grpselect - Select groups of a specified size from a daophot database.

pcalc - Do arithmetic operations on a list of daophot databases.

pconcat - Concatenate a list of daophot databases, astropy table.

pdump - Print selected fields from a list of daophot databases.

pselect - Select records from a daophot database.

psort - Sort a daophot database.

pfmerge - Merge a list of photometry databases.

  • The output of photutils.psf.DAOGroup, linked in the group entry, as well as most photutils outputs are an Astropy Table. This class can be sorted, split, joined, and have a function applied. Basic arithmetic can be done automatically by simply calling the desired columns with the operator of your choice. See the tables.ttools notebook in STAK for the ttools mapping.

addstar

Please review the Notes section above before running any examples in this notebook

addstar - Add artificial stars to an image using the computed psf.

image0

pstselect

Please review the Notes section above before running any examples in this notebook

pstselect - Select candidate psf stars based on proximity.

  • see photutils.psf.DAOGroup find_group method.

Not Replacing

Build photutils doc pages, and put in link

  • centerpars - Edit the centering algorithm parameters. Deprecated.
  • daoedit - Review/edit algorithm parameters interactively. Deprecated.
  • daopars - Edit the daophot algorithms parameter set. See photutils documentation.
  • daotest - Run basic tests on the daophot package tasks. Deprecated.
  • datapars - Edit the image data dependent parameters. Deprecated
  • findpars - Edit the star detection parameters. Deprecated.
  • fitskypars - Edit the sky fitting algorithm parameters. Deprecated.
  • photpars - Edit the aperture photometry parameters. Deprecated.
  • setimpars - Save/restore parameter sets for a particular image. Depreciated.
  • pconvert - Convert a text database to a tables database, see Astropy unified I/O
  • pexamine - Interactively examine and edit a daophot database. Deprecated, use Astropy Table tools
  • prenumber - Renumber stars in a daophot database, see grpselect-pcalc-pconcat-pdump-pselect-psort
  • seepsf - convert a sampled PSF lookup table to a PSF image. Deprecated.