AstrometricCatalogStep

The final source extraction that the official pipeline performs on the images in level 3 can be suboptimal (especially for MIRI mosaics). This provides an alternative that we find tends to work better, and will produce better absolute astrometric matches in AstrometricAlignStep.

API

class pjpipe.AstrometricCatalogStep(target, band, in_dir, snr=5, starfind_method='dao', starfind_prefilter=None, starfind_parameters=None, dao_parameters=None, overwrite=False)[source]

Generate a catalog for absolute astrometric alignment

Parameters:

  • in_dir – Directory to search for files

  • snr – SNR to detect sources. Defaults to 5

  • starfind_method – Method for detecting sources in image. Options are given be ALLOWED_STARFIND_METHODS

  • starfind_parameters – Dictionary of parameters to pass to the starfinder

  • starfind_prefilter – Method for prefiltering the image before starfinding

  • dao_parameters – Dictionary of parameters to pass to DAOFinder

  • overwrite – Overwrite or not. Defaults to False

do_step()[source]

Run astrometric catalog step

generate_astro_cat(file)[source]

Generate an astrometric catalogue using given starfinder

Parameters:

file – File to run starfinder on