--- header unit 0: primary ---
SIMPLE = T / file does conform to FITS standard
BITPIX = -32 / number of bits per data pixel
NAXIS = 2 / number of data axes
NAXIS1 = 2048 / length of data axis 1
NAXIS2 = 2048 / length of data axis 2
EXTEND = T / FITS dataset may contain extensions
COMMENT FITS (Flexible Image Transport System) format is defined in 'Astronomy
COMMENT and Astrophysics', volume 376, page 359; bibcode: 2001A&A...376..359H
WCSAXES = 2 / no comment
CTYPE1 = 'RA---TAN' / TAN (gnomic) projection
CTYPE2 = 'DEC--TAN' / TAN (gnomic) projection
EQUINOX = 2000. / Equatorial coordinates definition (yr)
LONPOLE = 180. / no comment
LATPOLE = 0. / no comment
CRVAL1 = 212.869247 / RA of reference point
CRVAL2 = 15.144444 / DEC of reference point
CRPIX1 = 1024.5 / X reference pixel
CRPIX2 = 1024.5 / Y reference pixel
CUNIT1 = 'deg' / X pixel scale units
CUNIT2 = 'deg' / Y pixel scale units
CD1_1 = -0.000763888888889 / Transformation matrix
CD1_2 = 0 / no comment
CD2_1 = 0 / no comment
CD2_2 = 0.000763888888889 / no comment
IMAGEW = 2048 / Image width, in pixels.
IMAGEH = 2048 / Image height, in pixels.
MAGZP = 22.5 / Magnitude zeropoint (in Vega mag)
UNW_SKY = -51.1416568934103 / Background value subtracted from coadd img
UNW_VER = 24230 / unWISE code SVN revision
UNW_DVER = 1 / unWISE data model version
UNW_URL = 'svn+ssh://astrometry.net/svn/tags/unwise-2' / SVN URL
UNW_DATE = '2013-12-16T19:25:15.105555' / unWISE run time
UNW_FR0 = 0 / unWISE frame start
UNW_FRN = 0 / unWISE N frames
UNW_MEDF = 50 / unWISE median filter sz
UNW_BGMA = 0 / unWISE background matching?