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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    = '2006-08-07'         / 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 = 'SKY-DEST-HPX'       /  Destriped sky spectra, HEALPix Version        
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 algorigthm                               
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= 'HIGH    '           /  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 =            612.18729 /  Optical frequency of initial data point in GHz
DELTA_NU=            13.604162 /  Optical frequency interval between data points
COMMENT                        /    in GHz                                      
NUM_FREQ=                  170 /  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  =                  745 / Number of 8 bit bytes in each row              
NAXIS2  =                 3072 / Number of rows                                 
PCOUNT  =                    0 / Number of bytes of data following table        
GCOUNT  =                    1 / Group count (always 1 for bintable extensions) 
TFIELDS =                    6 / Number of fields (columns) in the table        
COMMENT                                                                         
COMMENT                                                                         
COMMENT    FIRAS Destriped Sky Spectrum                                         
COMMENT    Project Dataset Record Structure                                     
COMMENT                                                                         
COMMENT                                                                         
COMMENT    HEALPix pixel number (resolution 4)                                  
TFORM1  = 'J       '           /                                                
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    Pixel weight                                                         
TFORM4  = 'E       '           /                                                
TTYPE4  = 'WEIGHT  '           /  entire fieldname = WEIGHT                     
TUNIT4  = '     '  /                                                            
COMMENT    Flag indicating whether or not the                                   
COMMENT       calibrated spectra in this pixel                                  
COMMENT       were used for destriping:                                         
COMMENT       1 = spectra were used;                                            
COMMENT       0 = spectra were not used.                                        
TFORM5  = 'B       '           /                                                
TTYPE5  = 'STR_USED '          /  entire fieldname = STR_USED                   
TUNIT5  = '     '  /                                                            
COMMENT    Destriped spectrum, in MJy/sr                                        
TFORM6  = '182E    '  /                                                         
TDIM6   = '(182)   '  /                                                         
TTYPE6  = 'SPECTRUM '          /  entire fieldname = SPECTRUM                   
TUNIT6  = 'MJy/sr  '  /                                                         
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