Еще раз спасибо!
А что такое WCS? 
world coordinate system = астрометрическая информация.
в простейшем виде вот так:
WCSAXES = 2 / no comment
CTYPE1 = 'RA---TAN-SIP' / TAN (gnomic) projection + SIP distortions
CTYPE2 = 'DEC--TAN-SIP' / TAN (gnomic) projection + SIP distortions
EQUINOX = 2000.0 / Equatorial coordinates definition (yr)
CRVAL1 = 179.016340085 / RA of reference point
CRVAL2 = -19.8979392162 / DEC of reference point
CRPIX1 = 2048.5 / X reference pixel
CRPIX2 = 2048.5 / Y reference pixel
CUNIT1 = 'deg ' / X pixel scale units
CUNIT2 = 'deg ' / Y pixel scale units
CD1_1 = 5.61604547828E-05 / Transformation matrix
CD1_2 = -5.09902137154E-05 / no comment
CD2_1 = -5.10054562432E-05 / no comment
CD2_2 = -5.61816789435E-05 / no comment