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FITS Header

Primary Header

SIMPLE  =                    T / file does conform to FITS standard
BITPIX  =                    8 / number of bits per data pixel
NAXIS   =                    0 / number of data axes
EXTEND  =                    T / FITS dataset may contain extensions
COMMENT   FITS (Flexible Image Transport System) format defined in Astronomy and
COMMENT   Astrophysics Supplement Series v44/p363, v44/p371, v73/p359, v73/p365.
COMMENT   Contact the NASA Science Office of Standards and Technology for the
COMMENT   FITS Definition document #100 and other FITS information.
DATE    = '2006-11-27'         / FITS file creation date (yyyy-mm-dd)
ORIGIN  = 'LAMBDA  '           /  Legacy Archive for Microwave Background Data
COMMENT                        /   Analysis
TELESCOP= 'COBE    '           /  COsmic Background Explorer satellite
INSTRUME= 'FIRAS   '           /  COBE instrument [DIRBE, DMR, FIRAS]
OBJECT  = 'ALL-SKY '           /  part of sky given [ALL-SKY, GAL-SLICE]
PRODUCT = 'UNCOMB-SKY-DEST'    / Uncombined destriped sky spectra
EQUINOX =               2000.0 /  equinox of coords in following tables
COMMENT
REFERENC= 'For additional information, please refer to the' /
REFERENC= 'COBE Far Infrared Absolute Spectrophotometer (FIRAS)' /
REFERENC= 'Explanatory Supplement, ed. J.C. Mather et al,' /
REFERENC= 'COBE Ref. Pub. No. 97-C (Greenbelt, MD: NASA/GSFC),' /
REFERENC= 'available in electronic form from the NSSDC and LAMBDA.' /
COMMENT
COMMENT     HEALPix specific keywords
PIXTYPE = 'HEALPIX '           / Pixel algorithm
ORDERING= 'NESTED  '           / Ordering scheme
RESOLUTN=                    4 /Resolution index
NSIDE   =                   16 /Resolution parameter
NPIX    =                 3072 /# of pixels
FIRSTPIX=                    0 /First pixel (0 based)
LASTPIX =                 3071 /Last pixel (0 based)
COMMENT
COMMENT     COBE specific keywords
DATE-BEG= '24/11/89'           /  date of initial data represented (dd/mm/yy)
DATE-END= '21/09/90'           /  date of final data represented (dd/mm/yy)
COMMENT
COMMENT     FIRAS specific keywords
CHANSCAN= 'LOWF    '           /  Field indicating combination of data from
COMMENT                        / various channels and mirror transport
COMMENT                        / mechanism scan modes.  LOWF is a combination
COMMENT                        / of the low frequency RLSS, RLFS, RLFL, LLSS,
COMMENT                        / LLFS, and LLFL data.  HIGH is a combination of
COMMENT                        / the high frequency RHSS, RHSF, RHLF, LHSS,
COMMENT                        / LHSF, and LHLF data.  HIF2, HIF3, and HIF4
COMMENT                        / divide the HIGH data into three frequency
COMMENT                        / bands, as indicated by the NU_ZERO and
COMMENT                        / NUM_FREQ fields.  HRES is a combination of the
COMMENT                        / high resolution RLLF and LLLF data.  For the
COMMENT                        / uncombined channel/scan mode labels, the first
COMMENT                        / two characters of the label indicate the
COMMENT                        / channel, the first being the instrument side:
COMMENT                        / right (R) or left (L); and the second being
COMMENT                        / the frequency:  high (H) or low (L).  The
COMMENT                        / third and fourth characters indicate the scan
COMMENT                        / mode, the third being the scan length:  short
COMMENT                        / (S) or long (L); and the fourth being the scan
COMMENT                        / speed:  slow (S) or fast (F).  In addition,
COMMENT                        / the scan mode may take the following values
COMMENT                        / for low frequency data only (channel = RL or
COMMENT                        / LL):
COMMENT                        /      FS: decimated SF data;
COMMENT                        /      FL: truncated LF data.
MODLLABL= 'PASS4   '           /  FIRAS calibration model solution label
MISS_SEG= 'ENTIRE_MISSION'     /  FIRAS segment of mission represented
NU_ZERO =            68.020812 /  Optical frequency of initial data point in GHz
DELTA_NU=            13.604162 /  Optical frequency interval between data points
COMMENT                          / in GHz
NUM_FREQ=                   43 /  Number of frequency points with good data
END

Extension Header 1

XTENSION= 'BINTABLE'           / Extension type is Binary Table
BITPIX  =                    8 / Binary data
NAXIS   =                    2 / Data are in a table
NAXIS1  =                  186 / Number of 8 bit bytes in each row
NAXIS2  =               134898 / Number of rows
PCOUNT  =                    0 / Number of bytes of data following table
GCOUNT  =                    1 / Group count (always 1 for bintable extensions)
TFIELDS =                    5 / Number of fields (columns) in the table
COMMENT    HEALPix pixel number (resolution 4)
TFORM1  = 'I       '           /
TTYPE1  = 'PIXEL   '           /  entire fieldname = PIXEL
TUNIT1  = '        '           /
COMMENT    Galactic longitude, in deg (0 -> 360)
TFORM2  = 'E       '           /
TTYPE2  = 'GAL_LON '           /  entire fieldname = GAL_LON
TUNIT2  = 'deg     '           /
COMMENT    Galactic latitude, in deg (-90 -> +90)
TFORM3  = 'E       '           /
TTYPE3  = 'GAL_LAT '           /  entire fieldname = GAL_LAT
TUNIT3  = 'deg     '           /
COMMENT    Destriped spectrum, in MJy/sr
TFORM4  = '43E     '           /
TDIM4   = '(43)    '           /
TTYPE4  = 'SPECTRUM '          /  entire fieldname = SPECTRUM
TUNIT4  = 'MJy/sr  '           /
COMMENT    Detector/Scan Mode ('LLSS','RLSS','LLFL','LLFS','RLFL', or 'RLFS')
TFORM5  = '4A      '           /
TTYPE5  = 'DET_MODE '          /  entire fieldname = DET_MODE
TUNIT5  = '        '           /
END

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Goddard Space Flight Center, National Aeronautics and Space Administration
HEASARC Director: Dr. Alan P. Smale
LAMBDA Director: Dr. Eric R. Switzer
NASA Official: Dr. Eric R. Switzer
Web Curator: Mr. Michael R. Greason