WMAP I Maps
(per frequency)
FITS Header Information

The data made available through this page has been updated. The most recent version of this data may be accessed through /product/map/current/

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 is defined in 'Astronomy
COMMENT   and Astrophysics', volume 376, page 359; bibcode: 2001A&A...376..359H 
DATE    = '2003-01-27T00:00:00' /file creation date (YYYY-MM-DDThh:mm:ss UT)    
TELESCOP= 'MAP     '           / Microwave Anisotropy Probe                     
OBJECT  = 'ALL-SKY '           / Portion of sky given                           
EQUINOX =               2000.0 / Equinox of coordinates                         
COMMENT   This file contains the MAP first year sky map for K band              
REFERENC= 'MAP Explanatory Supplement: http://lambda.gsfc.nasa.gov/             
VERSION = 'PASS 1  '           / Internal MAP Version                           
STARTGMT= '20012220000000000000' / Start time of TOD used                       
ENDGMT  = '20022212359000000000' / End time of TOD used                         
FREQ    = 'K band  '           / Frequency band                                 
STOKES  = 'Intensity'          / i, q, or u                                     
RESOLUTN=                    9 / Resolution index                               
SKYCOORD= 'Galactic'           / Coordinate system                              
GALMASK = '/map/data/flight/pass1/ref/proc_mask_K_p8_v1_unsm.fits' / Galaxy mask
PLANETS = 'MJSUN   '           / Planets avoided                                
COMMENT Planet codes: [M]ars, [J]upiter, [S]aturn, [U]ranus, [N]eptune          
SHIELDS = 'S       '           / Shield angle avoidance                         
COMMENT Shield codes: [S]un, [E]arth, [M]oon                                    
PIXTYPE = 'HEALPIX '           / Pixel algorithm                                
ORDERING= 'NESTED  '           / Ordering scheme                                
NSIDE   =                  512 / Resolution parameter                           
NPIX    =              3145728 / # of pixels                                    
FIRSTPIX=                    0 / First pixel (0 based)                          
LASTPIX =              3145727 / Last pixel (0 based)                           
END                                                                             

Extension Header #1

XTENSION= 'BINTABLE'           /binary table extension                          
BITPIX  =                    8 /8-bit bytes                                     
NAXIS   =                    2 /2-dimensional binary table                      
NAXIS1  =                    8 /width of table in bytes                         
NAXIS2  =              3145728 /number of rows in table                         
PCOUNT  =                    0 /size of special data area                       
GCOUNT  =                    1 /one data group (required keyword)               
TFIELDS =                    2 /number of fields in each row                    
TTYPE1  = 'TEMPERATURE'        /label for field   1                             
TFORM1  = '1E      '           /data format of field: 4-byte REAL               
TUNIT1  = 'mK, thermodynamic'  /physical unit of field                          
TTYPE2  = 'N_OBS   '           /label for field   2                             
TFORM2  = '1E      '           /data format of field: 4-byte REAL               
TUNIT2  = 'counts  '           /physical unit of field                          
EXTNAME = 'Archive Map Table'  /name of this binary table extension             
DATE    = '2003-01-27T00:00:00' /Table/MAP creation date                        
PIXTYPE = 'HEALPIX '           /Pixel algorithm                                 
ORDERING= 'NESTED  '           /Ordering scheme                                 
NSIDE   =                  512 /Resolution parameter                            
FIRSTPIX=                    0 /First pixel (0 based)                           
LASTPIX =              3145727 /Last pixel (0 based)                            
COMMENT   Temperature is in thermodynamic units                                 
COMMENT   N_obs is the effective number of observations in the pixel            
END                                                                             

More information concerning the format of this file is available.