ABOUT LAMBDA

FITS Headers

FIRAS_CALIBRATION_MODEL_LLLF.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= 'LLLF    '           /  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 =            23.807283 /  Optical frequency of initial data point in GHz
DELTA_NU=            3.4010405 /  Optical frequency interval between data points
COMMENT                          / in GHz                                       
OM_ZERO =            5.8536828 /  Audio frequency of initial data point in rad/s
DELTA_OM=            0.8362404 /  Audio frequency interval between data points  
COMMENT                          / in rad/s                                     
NUM_FREQ=                  182 /  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                                                                             

A service of the HEASARC and of the Astrophysics Science Division at NASA/GSFC
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