FITS Headers
FIRAS_CALIBRATION_MODEL_LLFA.FITS
Primary Header
SIMPLE = T / file does conform to FITS standard BITPIX = 32 / 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 = '24/09/97' / FITS file creation date (dd/mm/yy) ORIGIN = 'CDAC ' / Cosmology Data Analysis Center 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 = 'CAL-MOD ' / Calibration model solution 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.' / 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) PIXRESOL= 6 / Quad tree pixel resolution [6, 9] COMMENT COMMENT FIRAS specific keywords CHANSCAN= 'LLFA ' / Channel and mirror transport mechanism scan COMMENT / mode identifier. The first two characters COMMENT / indicate the channel, the first being the COMMENT / instrument side: right (R) or left (L); and COMMENT / the second being the frequency: high (H) or COMMENT / low (L). The third and fourth characters COMMENT / indicate the scan mode, the third being the COMMENT / scan length: short (S) or long (L); and the COMMENT / fourth being the scan speed: slow (S) or COMMENT / fast (F). In addition, the scan mode may COMMENT / take the following values for low frequency COMMENT / data only (channel = RL or LL): COMMENT / FS: decimated SF data; COMMENT / FL: truncated LF data. COMMENT / The scan mode value FA indicates: for high COMMENT / frequency data (channel = RH or LH), a COMMENT / combination of SF and LF data; and for low COMMENT / frequency data (channel = RL or LL), a COMMENT / combination of FS and FL 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 OM_ZERO = 16.724808 / Audio frequency of initial data point in rad/s DELTA_OM= 3.3449616 / Audio frequency interval between data points COMMENT / in rad/s NUM_FREQ= 43 / Number of frequency points with good data NORMALIZ= 2.991734E+00 / Instrumental gain function normalization, COMMENT / in (MJy*V)/(W*sr) END
Extension Header 2
XTENSION= 'BINTABLE' / Extension type is Binary Table BITPIX = 8 / Binary data NAXIS = 2 / Data are in a table NAXIS1 = 15600 / Number of 8 bit bytes in each row NAXIS2 = 1 / Number of rows PCOUNT = 0 / Number of bytes of data following table GCOUNT = 1 / Group count (always 1 for bintable extensions) TFIELDS = 45 / Number of fields (columns) in the table COMMENT COMMENT COMMENT FIRAS Calibration Model Solution COMMENT Project Dataset Record Structure COMMENT COMMENT COMMENT Electronics Gain Function COMMENT COMMENT Real part of electronics gain function (dimensionless) TFORM1 = '210E ' / TDIM1 = '(210) ' / TTYPE1 = 'RELEX_GA' / entire fieldname = RELEX_GAIN TUNIT1 = ' ' / COMMENT Imaginary part of electronics gain function (dimensionless) TFORM2 = '210E ' / TDIM2 = '(210) ' / TTYPE2 = 'IELEX_GA' / entire fieldname = IELEX_GAIN TUNIT2 = ' ' / COMMENT COMMENT Optical Transfer Function COMMENT COMMENT Real part of optical transfer function (dimensionless) TFORM3 = '210E ' / TDIM3 = '(210) ' / TTYPE3 = 'RTRANSFE' / entire fieldname = RTRANSFER TUNIT3 = ' ' / COMMENT Imaginary part of optical transfer function (dimensionless) TFORM4 = '210E ' / TDIM4 = '(210) ' / TTYPE4 = 'ITRANSFE' / entire fieldname = ITRANSFER TUNIT4 = ' ' / COMMENT COMMENT Bolometer Response Function COMMENT (for the mission average bolometer state; COMMENT response function = (1 + iwT)/S0, where COMMENT T is the time constant and COMMENT S0 is the DC response) COMMENT COMMENT Bolometer time constant, in s TFORM5 = '1E ' / TTYPE5 = 'TIME_CON' / entire fieldname = TIME_CONSTANT TUNIT5 = 's ' / COMMENT Bolometer DC response, in V/W TFORM6 = '1E ' / TTYPE6 = 'DC_RESPO' / entire fieldname = DC_RESPONSE TUNIT6 = 'V/W ' / COMMENT COMMENT Apodization Function COMMENT (applied to interferograms in the time domain COMMENT prior to Fourier transformation) COMMENT COMMENT Apodization function (dimensionless) TFORM7 = '512E ' / TDIM7 = '(512) ' / TTYPE7 = 'APODIZAT' / entire fieldname = APODIZATION TUNIT7 = ' ' / COMMENT COMMENT Bolometer Model Parameters COMMENT COMMENT Characteristic resistance, in ohms TFORM8 = '1E ' / TTYPE8 = 'BOLPARM_' / entire fieldname = BOLPARM_R0 TUNIT8 = 'ohm ' / COMMENT Characteristic temperature, in K TFORM9 = '1E ' / TTYPE9 = 'BOLPARM2' / entire fieldname = BOLPARM_T0 TUNIT9 = 'K ' / COMMENT Coefficient of thermal conductance, in W/K^(bolparm_beta+1) TFORM10 = '1E ' / TTYPE10 = 'BOLPARM3' / entire fieldname = BOLPARM_G1 TUNIT10 = 'W/K^(bolparm_beta+1)' / COMMENT Index of thermal conductance (dimensionless) TFORM11 = '1E ' / TTYPE11 = 'BOLPARM4' / entire fieldname = BOLPARM_BETA TUNIT11 = ' ' / COMMENT Resistance due to electric field, in K/V TFORM12 = '1E ' / TTYPE12 = 'BOLPARM5' / entire fieldname = BOLPARM_RHO TUNIT12 = 'K/V ' / COMMENT Heat capacity coefficient for linear temperature term, in J/K^2 TFORM13 = '1E ' / TTYPE13 = 'BOLPARM6' / entire fieldname = BOLPARM_C1 TUNIT13 = 'J/K^2 ' / COMMENT Heat capacity coefficient for cubic temperature term, in J/K^4 TFORM14 = '1E ' / TTYPE14 = 'BOLPARM7' / entire fieldname = BOLPARM_C3 TUNIT14 = 'J/K^4 ' / COMMENT Readout JFET offset, in V TFORM15 = '1E ' / TTYPE15 = 'BOLPARM8' / entire fieldname = BOLPARM_JO TUNIT15 = 'V ' / COMMENT Readout JFET gain (dimensionless) TFORM16 = '1E ' / TTYPE16 = 'BOLPARM9' / entire fieldname = BOLPARM_JG TUNIT16 = ' ' / COMMENT Load resistance, in ohms TFORM17 = '1E ' / TTYPE17 = 'BOLPARM10' / entire fieldname = BOLPARM_RL TUNIT17 = 'ohm ' / COMMENT COMMENT Mission Average Bolometer State COMMENT COMMENT Commanded bolometer bias, in V TFORM18 = '1E ' / TTYPE18 = 'BOLOM_BI' / entire fieldname = BOLOM_BIAS TUNIT18 = 'V ' / COMMENT Bolometer readout voltage, in V TFORM19 = '1E ' / TTYPE19 = 'BOLOM_VO' / entire fieldname = BOLOM_VOLTAGE TUNIT19 = 'V ' / COMMENT Bolometer operating temperature, in K TFORM20 = '1E ' / TTYPE20 = 'BOLOM_TE' / entire fieldname = BOLOM_TEMPERATURE TUNIT20 = 'K ' / COMMENT Bolometer bath temperature, in K TFORM21 = '1E ' / TTYPE21 = 'BOLOM_B2' / entire fieldname = BOLOM_BATHTEMP TUNIT21 = 'K ' / COMMENT COMMENT Optical Model COMMENT COMMENT Real part of internal calibrator emissivity (dimensionless) TFORM22 = '210E ' / TDIM22 = '(210) ' / TTYPE22 = 'RICAL ' / entire fieldname = RICAL TUNIT22 = ' ' / COMMENT Imaginary part of internal calibrator emissivity (dimensionless) TFORM23 = '210E ' / TDIM23 = '(210) ' / TTYPE23 = 'IICAL ' / entire fieldname = IICAL TUNIT23 = ' ' / COMMENT Real part of sky horn emissivity (dimensionless) TFORM24 = '210E ' / TDIM24 = '(210) ' / TTYPE24 = 'RSKYHORN' / entire fieldname = RSKYHORN TUNIT24 = ' ' / COMMENT Imaginary part of sky horn emissivity (dimensionless) TFORM25 = '210E ' / TDIM25 = '(210) ' / TTYPE25 = 'ISKYHORN' / entire fieldname = ISKYHORN TUNIT25 = ' ' / COMMENT Real part of reference horn emissivity (dimensionless) TFORM26 = '210E ' / TDIM26 = '(210) ' / TTYPE26 = 'RREFHORN' / entire fieldname = RREFHORN TUNIT26 = ' ' / COMMENT Imaginary part of reference horn emissivity (dimensionless) TFORM27 = '210E ' / TDIM27 = '(210) ' / TTYPE27 = 'IREFHORN' / entire fieldname = IREFHORN TUNIT27 = ' ' / COMMENT Real part of dihedral emissivity (dimensionless) TFORM28 = '210E ' / TDIM28 = '(210) ' / TTYPE28 = 'RDIHEDRA' / entire fieldname = RDIHEDRAL TUNIT28 = ' ' / COMMENT Imaginary part of dihedral emissivity (dimensionless) TFORM29 = '210E ' / TDIM29 = '(210) ' / TTYPE29 = 'IDIHEDRA' / entire fieldname = IDIHEDRAL TUNIT29 = ' ' / COMMENT Real part of structure emissivity (dimensionless) TFORM30 = '210E ' / TDIM30 = '(210) ' / TTYPE30 = 'RSTRUCTU' / entire fieldname = RSTRUCTURE TUNIT30 = ' ' / COMMENT Imaginary part of structure emissivity (dimensionless) TFORM31 = '210E ' / TDIM31 = '(210) ' / TTYPE31 = 'ISTRUCTU' / entire fieldname = ISTRUCTURE TUNIT31 = ' ' / COMMENT Real part of bolometer emissivity (dimensionless) TFORM32 = '210E ' / TDIM32 = '(210) ' / TTYPE32 = 'RBOLOMET' / entire fieldname = RBOLOMETER TUNIT32 = ' ' / COMMENT Imaginary part of bolometer emissivity (dimensionless) TFORM33 = '210E ' / TDIM33 = '(210) ' / TTYPE33 = 'IBOLOMET' / entire fieldname = IBOLOMETER TUNIT33 = ' ' / COMMENT COMMENT Optical Model Harmonic Correction Coefficients COMMENT COMMENT 2nd harmonic correction coefficient (dimensionless) TFORM34 = '1E ' / TTYPE34 = 'OPTPARM_' / entire fieldname = OPTPARM_2H TUNIT34 = ' ' / COMMENT 3rd harmonic correction coefficient (dimensionless) TFORM35 = '1E ' / TTYPE35 = 'OPTPARM2' / entire fieldname = OPTPARM_3H TUNIT35 = ' ' / COMMENT COMMENT Optical Model Vibration Correction Coefficients COMMENT (primary vibration correction is a COMMENT quartic polynomial in time) COMMENT COMMENT Primary vibration correction offset (dimensionless) TFORM36 = '1E ' / TTYPE36 = 'OPTPARM3' / entire fieldname = OPTPARM_VP0 TUNIT36 = ' ' / COMMENT Primary vibration correction linear coefficient, in yr^(-1) TFORM37 = '1E ' / TTYPE37 = 'OPTPARM4' / entire fieldname = OPTPARM_VP1 TUNIT37 = 'yr^(-1) ' / COMMENT Primary vibration correction quadratic coefficient, in yr^(-2) TFORM38 = '1E ' / TTYPE38 = 'OPTPARM5' / entire fieldname = OPTPARM_VP2 TUNIT38 = 'yr^(-2) ' / COMMENT Primary vibration correction cubic coefficient, in yr^(-3) TFORM39 = '1E ' / TTYPE39 = 'OPTPARM6' / entire fieldname = OPTPARM_VP3 TUNIT39 = 'yr^(-3) ' / COMMENT Primary vibration correction quartic coefficient, in yr^(-4) TFORM40 = '1E ' / TTYPE40 = 'OPTPARM7' / entire fieldname = OPTPARM_VP4 TUNIT40 = 'yr^(-4) ' / COMMENT Secondary vibration correction coefficient (dimensionless) TFORM41 = '1E ' / TTYPE41 = 'OPTPARM8' / entire fieldname = OPTPARM_VS TUNIT41 = ' ' / COMMENT COMMENT Internal Calibrator Temperature Correction Parameters COMMENT (temperature drift is exponential in time COMMENT since COBE aperture cover ejection: COMMENT 11:18:00 UTC, 21 November 1989) COMMENT COMMENT Ical drift amplitude, in K TFORM42 = '1E ' / TTYPE42 = 'DRIFT_AM' / entire fieldname = DRIFT_AMP TUNIT42 = 'K ' / COMMENT Ical drift time constant, in yr TFORM43 = '1E ' / TTYPE43 = 'DRIFT_TC' / entire fieldname = DRIFT_TC TUNIT43 = 'yr ' / COMMENT Ical drift offset, in K TFORM44 = '1E ' / TTYPE44 = 'DRIFT_OF' / entire fieldname = DRIFT_OFFSET TUNIT44 = 'K ' / COMMENT COMMENT External Calibrator Temperature Correction COMMENT COMMENT Xcal temperature correction, in K TFORM45 = '1E ' / TTYPE45 = 'XCAL_COR' / entire fieldname = XCAL_CORRECTION TUNIT45 = 'K ' / COMMENT END
