Collect PANSTARRS (PS1) sources with g<20 for an input image that has a valid WCS solution in the FITS header.

% ps1_cdfp --help 
Usage: ps1_cdfp 20170903T034319.0_acm_sci.fits N
arg1 - name of FITS image with WCS installed 
arg2 - run in debug/verbose mode (Y/N)