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FITS Headers

FIRAS_COADDED_SKY_INTERFEROGRAMS_LLFS.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    = '28/07/97'           / 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 = 'SKY-IFG '           /  Coadded sky interferograms                    
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= 'LLFS    '           /  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.                  
MODLLABL= 'PASS4   '           /  FIRAS calibration model solution label        
MISS_SEG= 'ENTIRE_MISSION'     /  FIRAS segment of mission represented          
NU_ZERO =            68.020812 /  Optical frequency of initial variance         
COMMENT                          / point in GHz                                 
DELTA_NU=            13.604162 /  Optical frequency interval between variance   
COMMENT                          / points in GHz                                
NUM_FREQ=                   43 /  Number of frequency points in variance        
COMMENT                          / with good data                               
PEAK_POS=                   90 /  Interferogram peak position                   
FFT_LENG=                  160 /  Length of Fast Fourier Transform used         
END                                                                             

Extension Header 2

XTENSION= 'BINTABLE'           / Extension type is Binary Table                 
BITPIX  =                    8 / Binary data                                    
NAXIS   =                    2 / Data are in a table                            
NAXIS1  =                 6266 / Number of 8 bit bytes in each row              
NAXIS2  =                 5048 / Number of rows                                 
PCOUNT  =                    0 / Number of bytes of data following table        
GCOUNT  =                    1 / Group count (always 1 for bintable extensions) 
TFIELDS =                   32 / Number of fields (columns) in the table        
COMMENT                                                                         
TIMVERSN= 'OGIP/93-003'        /  OGIP memo number where the convention         
COMMENT                          / is described                                 
COMMENT      The times reported in this file are atomic seconds elapsed         
COMMENT      since 00:00:00 UTC, 1 January 1981.  Time information is           
COMMENT      recorded in a manner consistent with the convention specified      
COMMENT      in OGIP/93-003 with the understanding that time is counted         
COMMENT      in atomic seconds and the origin of time (MJDREF) is quoted        
COMMENT      in ephemeris MJD.                                                  
TIMESYS = '1981.00 '           /  time system (same as IRAS)                    
MJDREFI =                44605 /  Integer portion of ephemeris MJD              
COMMENT                    / corresponding to 0h UTC 1 Jan 1981                 
MJDREFF =        0.00059240741 /  Fractional portion of ephemeris MJD           
COMMENT                    / corresponding to 0h UTC 1 Jan 1981                 
TIMEUNIT= 's       '           /  unit for TSTART, TSTOP, TIMEZERO = seconds    
TSTART  =        280713605.000 /  observation start time in TIMESYS system      
TSTOP   =        306806405.990 /  observation stop time in TIMESYS system       
COMMENT                                                                         
COMMENT                                                                         
COMMENT    FIRAS Coadded Interferogram                                          
COMMENT    Project Dataset Record Structure                                     
COMMENT                                                                         
COMMENT                                                                         
COMMENT    Instrument Attitude Information                                      
COMMENT                                                                         
COMMENT    FIRAS pixel number (resolution 6)                                    
TFORM1  = '1J      '           /                                                
TTYPE1  = 'PIXEL   '           /  entire fieldname = PIXEL                      
TUNIT1  = '        '           /                                                
COMMENT    Galactic longitude, in deg (0 -> 360)                                
TFORM2  = '1E      '           /                                                
TTYPE2  = 'GAL_LON '           /  entire fieldname = GAL_LON                    
TUNIT2  = 'deg     '           /                                                
COMMENT    Galactic latitude, in deg (-90 -> +90)                               
TFORM3  = '1E      '           /                                                
TTYPE3  = 'GAL_LAT '           /  entire fieldname = GAL_LAT                    
TUNIT3  = 'deg     '           /                                                
COMMENT    Ecliptic longitude, epoch 2000.0, in deg (0 -> 360)                  
TFORM4  = '1E      '           /                                                
TTYPE4  = 'ECL_LON '           /  entire fieldname = ECL_LON                    
TUNIT4  = 'deg     '           /                                                
COMMENT    Ecliptic latitude, epoch 2000.0, in deg (-90 -> +90)                 
TFORM5  = '1E      '           /                                                
TTYPE5  = 'ECL_LAT '           /  entire fieldname = ECL_LAT                    
TUNIT5  = 'deg     '           /                                                
COMMENT    Right ascension, in deg (0 -> 360)                                   
TFORM6  = '1E      '           /                                                
TTYPE6  = 'RA      '           /  entire fieldname = RA                         
TUNIT6  = 'deg     '           /                                                
COMMENT    Declination, in deg (-90 -> +90)                                     
TFORM7  = '1E      '           /                                                
TTYPE7  = 'DEC     '           /  entire fieldname = DEC                        
TUNIT7  = 'deg     '           /                                                
COMMENT                                                                         
COMMENT    Coadded Interferogram and Variances                                  
COMMENT                                                                         
COMMENT    Coadded interferogram, in counts                                     
TFORM8  = '512E    '           /                                                
TDIM8   = '(512)   '           /                                                
TTYPE8  = 'COADDED_'           /  entire fieldname = COADDED_IFG                
TUNIT8  = '        '           /                                                
COMMENT    Variance of real part of coadd spectrum, in (MJy/sr)^2               
TFORM9  = '210E    '           /                                                
TDIM9   = '(210)   '           /                                                
TTYPE9  = 'REAL_VAR'           /  entire fieldname = REAL_VARIANCE              
TUNIT9  = '(MJy/sr)^2'         /                                                
COMMENT    Variance of imaginary part of coadd spectrum, in (MJy/sr)^2          
TFORM10 = '210E    '           /                                                
TDIM10  = '(210)   '           /                                                
TTYPE10 = 'IMAG_VAR'           /  entire fieldname = IMAG_VARIANCE              
TUNIT10 = '(MJy/sr)^2'         /                                                
COMMENT    Covariance between real and imaginary                                
COMMENT       parts of coadd spectrum, in (MJy/sr)^2                            
TFORM11 = '210E    '           /                                                
TDIM11  = '(210)   '           /                                                
TTYPE11 = 'REAL_IMA'           /  entire fieldname = REAL_IMAG_VARIANCE         
TUNIT11 = '(MJy/sr)^2'         /                                                
COMMENT                                                                         
COMMENT    Number and Times of IFGs                                             
COMMENT                                                                         
COMMENT    Number of IFGs in coadd                                              
TFORM12 = '1J      '           /                                                
TTYPE12 = 'NUM_IFGS'           /  entire fieldname = NUM_IFGS                   
TUNIT12 = '        '           /                                                
COMMENT    Glitch rate for coadded IFG, in glitches/s                           
TFORM13 = '1E      '           /                                                
TTYPE13 = 'GLITCH_R'           /  entire fieldname = GLITCH_RATE                
TUNIT13 = 'gl/s    '           /                                                
COMMENT    Glitch rate weighted number of IFGs in coadd                         
TFORM14 = '1E      '           /                                                
TTYPE14 = 'ADJ_NUM_'           /  entire fieldname = ADJ_NUM_IFGS               
TUNIT14 = '        '           /                                                
COMMENT    Average data collection time in seconds since                        
COMMENT       00:00.00 UTC, 1 January 1981                                      
TFORM15 = '1D      '           /                                                
TTYPE15 = 'TIME    '           /  entire fieldname = TIME                       
TUNIT15 = 's       '           /                                                
COMMENT    Observation times of IFGs in the coadd;                              
COMMENT       in hundredths of days since ejection of the                       
COMMENT       FIRAS aperture cover at                                           
COMMENT       11:18.00 UTC, 21 November 1989                                    
TFORM16 = '100J    '           /                                                
TDIM16  = '(100)   '           /                                                
TTYPE16 = 'IFG_TIME'           /  entire fieldname = IFG_TIMES                  
TUNIT16 = 'd*100   '           /                                                
COMMENT    Flag indicating orphan IFGs, which occur                             
COMMENT       when a coadd is composed of only 1 or                             
COMMENT       2 IFGs.  In all other cases, the coadd                            
COMMENT       is composed of three or more IFGs;                                
COMMENT       applicable only to sky data.                                      
COMMENT       Flag = 1 indicates 1 or 2 IFGS in the coadd;                      
COMMENT       flag = 0 indicates 3 or more IFGs in the coadd.                   
TFORM17 = '1B      '           /                                                
TTYPE17 = 'ORPHANS '           /  entire fieldname = ORPHANS                    
TUNIT17 = '        '           /                                                
COMMENT                                                                         
COMMENT    Template Information                                                 
COMMENT                                                                         
COMMENT    Number of templates subtracted from coadded IFG                      
TFORM18 = '1J      '           /                                                
TTYPE18 = 'NUM_TEMP'           /  entire fieldname = NUM_TEMPLATES              
TUNIT18 = '        '           /                                                
COMMENT    Number of IFGS used in forming the templates                         
TFORM19 = '1J      '           /                                                
TTYPE19 = 'TPL_NUM_'           /  entire fieldname = TPL_NUM_IFGS               
TUNIT19 = '        '           /                                                
COMMENT    Flag indicating use of IFGs from neighboring                         
COMMENT       pixels in template formation (suitable                            
COMMENT       IFGs from 8 neighboring pixels);                                  
COMMENT       applicable only to sky data.                                      
COMMENT       Flag = 1 indicates neighbor IFGs were used;                       
COMMENT       flag = 0 indicates neighbor IFGs were not used.                   
TFORM20 = '1B      '           /                                                
TTYPE20 = 'NEIGHBOR'           /  entire fieldname = NEIGHBORS                  
TUNIT20 = '        '           /                                                
COMMENT    Number of IFGS from neighboring pixels used in                       
COMMENT       forming the templates; only for sky data                          
TFORM21 = '1J      '           /                                                
TTYPE21 = 'NBR_NUM_'           /  entire fieldname = NBR_NUM_IFGS               
TUNIT21 = '        '           /                                                
COMMENT    Observation times of IFGs used in template                           
COMMENT       formation; in seconds since                                       
COMMENT       00:00.00 UTC, 1 January 1981                                      
TFORM22 = '100D    '           /                                                
TDIM22  = '(100)   '           /                                                
TTYPE22 = 'TPL_TIME'           /  entire fieldname = TPL_TIMES                  
TUNIT22 = 's       '           /                                                
COMMENT    Pixel numbers of IFGs used in templates                              
TFORM23 = '100J    '           /                                                
TDIM23  = '(100)   '           /                                                
TTYPE23 = 'TPL_PIXE'           /  entire fieldname = TPL_PIXELS                 
TUNIT23 = '        '           /                                                
COMMENT                                                                         
COMMENT    Bolometer Bias and Voltage                                           
COMMENT                                                                         
COMMENT    Commanded bolometer bias, in V                                       
TFORM24 = '1E      '           /                                                
TTYPE24 = 'BOLOM_BI'           /  entire fieldname = BOLOM_BIAS                 
TUNIT24 = 'V       '           /                                                
COMMENT    Bolometer readout voltage, in V                                      
TFORM25 = '1E      '           /                                                
TTYPE25 = 'BOLOM_VO'           /  entire fieldname = BOLOM_VOLTAGE              
TUNIT25 = 'V       '           /                                                
COMMENT                                                                         
COMMENT    Instrument Temperatures                                              
COMMENT                                                                         
COMMENT    External calibrator temperature, in K                                
TFORM26 = '1E      '           /                                                
TTYPE26 = 'XCAL_TEM'           /  entire fieldname = XCAL_TEMP                  
TUNIT26 = 'K       '           /                                                
COMMENT    Internal calibrator temperature, in K                                
TFORM27 = '1E      '           /                                                
TTYPE27 = 'ICAL_TEM'           /  entire fieldname = ICAL_TEMP                  
TUNIT27 = 'K       '           /                                                
COMMENT    Sky horn temperature, in K                                           
TFORM28 = '1E      '           /                                                
TTYPE28 = 'SKYHORN_'           /  entire fieldname = SKYHORN_TEMP               
TUNIT28 = 'K       '           /                                                
COMMENT    Reference horn temperature, in K                                     
TFORM29 = '1E      '           /                                                
TTYPE29 = 'REFHORN_'           /  entire fieldname = REFHORN_TEMP               
TUNIT29 = 'K       '           /                                                
COMMENT    Dihedral mirror temperature, in K                                    
TFORM30 = '1E      '           /                                                
TTYPE30 = 'DIHEDRAL'           /  entire fieldname = DIHEDRAL_TEMP              
TUNIT30 = 'K       '           /                                                
COMMENT    Collimator mirror temperature, in K                                  
TFORM31 = '1E      '           /                                                
TTYPE31 = 'MIRROR_T'           /  entire fieldname = MIRROR_TEMP                
TUNIT31 = 'K       '           /                                                
COMMENT    Bolometer bath temperature, in K                                     
TFORM32 = '1E      '           /                                                
TTYPE32 = 'BATH_TEM'           /  entire fieldname = BATH_TEMP                  
TUNIT32 = 'K       '           /                                                
COMMENT                                                                         
END                                                                             

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