FITS Headers
firas_hpx_uncombined_destriped_cal_spectra_lowf.fits
Primary Header
SIMPLE = T / Written by IDL: Fri Oct 26 12:11:21 2018
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-CAL-DEST' / Uncombined destriped calibration spectra
EQUINOX = 2000.00 / 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 = 68.0208120000 / Optical frequency of initial data point in GHz
DELTA_NU= 13.6041620000 / Optical frequency interval between data points
COMMENT / in GHz
NUM_FREQ= 43 / Number of frequency points with good data
END
Extension Header 2
XTENSION= 'BINTABLE' / Extension type is Binary Table
BITPIX = 8 / Binary data
NAXIS = 2 / Data are in a table
NAXIS1 = 176 / Number of 8 bit bytes in each row
NAXIS2 = 1511 / Number of rows
PCOUNT = 0 / Number of bytes of data following table
GCOUNT = 1 / Group count (always 1 for bintable extensions)
TFIELDS = 2 / Number of fields (columns) in the table
COMMENT Destriped spectrum, in MJy/sr
TFORM1 = '43E ' /
TDIM1 = '(43) ' /
TTYPE1 = 'SPECTRUM ' / entire fieldname = SPECTRUM
TUNIT1 = 'MJy/sr ' /
COMMENT Detector/Scan Mode ('LLSS','RLSS','LLFL','LLFS','RLFL', or 'RLFS')
TFORM2 = '4A ' /
TTYPE2 = 'DET_MODE ' / entire fieldname = DET_MODE
TUNIT2 = ' ' /
END
