from astropy.io import fits import sys filename='4XMM_DR12cat_slim_v1.0_UDS.fits.catalog' fout=filename.replace(".fits.catalog", ".names.reg") hdul = fits.open(filename) #hdul.info() tbdata = hdul[1].data with open("../../products/{}".format(fout), 'w') as writer: for rec in tbdata: #writer.write("fk5;point({}, {})\n".format(rec['sc_ra'],rec['sc_dec'])) writer.write("fk5;circle({}, {}, {}) # text={{{}}}\n".format(rec['sc_ra'],rec['sc_dec'],rec['sc_poserr']/3600,rec['IAUNAME']))