WMAP FITS Header

Primary Header

SIMPLE  =                    T / file does conform to FITS standard
BITPIX  =                  -32 / number of bits per data pixel
NAXIS   =                    3 / number of data axes
NAXIS1  =                  250 / in-scan axis
NAXIS2  =                  250 / cross-scan axis
NAXIS3  =                    4 / array id index
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
DATE    = '2003-01-28T00:00:00' /file creation date (YYYY-MM-DDThh:mm:ss UT)
TELESCOP= 'MAP     '           / Microwave Anisotropy Probe
OBJECT  = 'JUPITER '           / Beam maps of Jupiter
COMMENT   This file contains beam maps constructed from sightings of Jupiter
COMMENT   during the first year of MAP observations. Data here are for the
COMMENT   differencing assembly indicated by the DA keyword. The contents of the
COMMENT   four 250x250 arrays are identified as follows from the CTYPE3 value:
COMMENT   1 = beam map for Side A, in mK, antenna temperature
COMMENT   2 = statistical noise for each side A pixel, in mK, antenna temp.
COMMENT   3 = beam map for Side B, in mK, antenna temperature
COMMENT   4 = statistical noise for each side B pixel, in mK, antenna temp.
COMMENT   Pixels with no coverage have values of zero.  Beam response has  not
COMMENT   been corrected for the input transmission imbalance (A/B asymmetry).
COMMENT   Origin of the focal plane coordinates [Xbeam,Ybeam] is the primary
COMMENT   optic axis for either the A or B side; the individual antenna feeds
COMMENT   are clustered about this axis.
REFERENC= 'MAP Explanatory Supplement: http://lambda.gsfc.nasa.gov/
VERSION = 'PASS 1  '           / Internal MAP Version
STARTGMT= '20012720000000000000' / Start time of TOD used
ENDGMT  = '20020952359000000000' / End time of TOD used
DA      = 'W2      '           / Differencing Assembly
STOKES  = 'Intensity'          / i, q, or u
GALMASK = '/map/data/flight/pass1/ref/alt_mask_K_p2_v2_src.fits' / Galaxy mask
SHIELDS = 'S       '           / Shield angle avoidance
COMMENT Shield codes: [S]un, [E]arth, [M]oon
COMMENT
CRVAL1  =          -4.9800000  / Value at first pixel (degrees)
CRPIX1  =                   1  / position of first pixel
CTYPE1  = 'Xbeam'              / in-scan coordinate; range +-5 degrees
CDELT1  =           0.0400000  / in-scan bin increment, degree per pixel
COMMENT
CRVAL2  =          -4.9800000  / Value at first pixel (degrees)
CRPIX2  =                   1  / position of first pixel
CTYPE2  = 'Ybeam'              / cross-scan coordinate, range +-5 degrees
CDELT2  =           0.0400000  / x-scan bin increment, degree per pixel
COMMENT
CRVAL3  =                   1  /
CRPIX3  =                   1  /
CTYPE3  = 'Array id'           / identifier specifying contents of 4 map arrays
CDELT3  =                   1  /
COMMENT
END