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Table 1 shows the header of the LOG02409B2 intensity image, the map of M 31 at 25 microns.

 

Table 1. Sample FITS header
 



SIMPLE  =                    T
BITPIX  =                   32
NAXIS   =                    2
NAXIS1  =                  100
NAXIS2  =                  780
BLOCKED =                    T         / TAPE RECORDS MAY BE BLOCKED
BSCALE  =         4.323207E+04          / TRUE=TAPE*BSCALE + BZERO
BZERO   =         0.0
BUNIT   = 'JY/SR   '                    / INTN
BLANK   =          -2000000000          / TAPE VALUE FOR EMPTY CELL
CRVAL1  =         9.912297E+00          / RA AT ORIGIN (DEGREES)
CRPIX1  =                  51.          / Z-AXIS ORIGIN (CELL) = (NZ/2)+1
CTYPE1  = 'RA---SIN'                    / DECREASES IN VALUE AS SAMPLE INDEX
COMMENT                                   INCREASES  (ORTHOGRAPHIC PROJECTION)
CDELT1  =        -3.333332E-02          / Z-GRID CELL WIDTH (DEGREES)
CROTA1  =         0.0                   / TWIST ANGLE UNDEFINED FOR Z-AXIS
CRVAL2  =         4.105859E+01          / DEC AT ORIGIN (DEGREES)
CRPIX2  =                 391.          / Y-AXIS ORIGIN (CELL)= (NY/2)+1
CTYPE2  = 'DEC--SIN'                    / INCREASES IN VALUE AS LINE INDEX
COMMENT                                   INCREASES  (ORTHOGRAPHIC PROJECTION)
CDELT2  =         4.166663E-03          / Y-GRID CELL WIDTH (DEGREES)
CROTA2  =         4.659000E+01          / ROTATES +NAXIS2 INTO +DEC AXIS (ANGLE
COMMENT                                   MEASURED POSITIVE CCW FROM +NAXIS2 TO
COMMENT                                   +DEC)  (DEGREES)
CRVAL3  =              2.5E-05          / WAVELENGTH IN METERS
CRPIX3  =                   1.
CTYPE3  = 'LAMBDA  '
CDELT3  =                   0.
CROTA3  =                   0.
DATAMAX =         4.107046E+06          / JY/SR    (TRUE VALUE)
DATAMIN =        -9.943376E+05          / JY/SR    (TRUE VALUE)
BIAS    =         5.801403E+07          / BIAS LEVEL (GRID REF) IN JY/SR
EPOCH   =                1950.          / EME50
DATE-OBS= ' 0/ 0/83'                    / DATE OF OBSERVATION (DD/MM/YY)
DATE    = '23/ 2/88'                    / DATE THIS TAPE WRITTEN (DD/MM/YY)
ORIGIN  = 'JPL-IRAS'                    / INSTITUTION
TELESCOP= 'IRAS    '
INSTRUME= 'DEEPSKY '
COMMENT                                   DSSID = SS02
DSKYGRID=                2409.          / DEEPSKY GRID NO.
DATE-CR = '41861446'                    / DSGAD O/P FILE CREATION DATE(YDDDHHMM)
COMMENT                                   EST.MEDIAN NOISE= 8.646412E+04 JY/SR
HISTORY                                   CALFAC USED = 1.900E+13
COMMENT                                   GRID TWIST = -1.334100E+02 (DEG) MEAS-
COMMENT                                   URED FROM SOUTH TO +Y, CW IS POSITIVE.
COMMENT                                   GAIN NORM. USED =   8.600000E-01
COMMENT                                   MFILT =         1
COMMENT                                   KFILT =         0
OBJECT  = 'CG 132  '                    / OBSERVER I.D.+IGO'S A.O.NO.
COMMENT                                   IGO'S REP. SEQ. NO. =  0
OBSERVER= 'DPM06B  '                    / DS01,2 SIS: C1 FIELD
COMMENT                                   OBJ.NAME NO. (C2) FIELD =  3
COMMENT                                   DS01,2 SIS: D(1-4) =  0 37 51  5
COMMENT                                   DS01,2 SIS: E(1-3) =  2  2 28
COMMENT                                   DS01,2 SIS: PROG = IPM06B
COMMENT                                   # DEEP SKY GRID COMPONENTS =  12
COMMENT                                   GCOMPS:    59    79    84   101   102
COMMENT                                   GCOMPS:   103   104   117   120   121
COMMENT                                   GCOMPS:   125   146
COMMENT    REFERENCES:
COMMENT  IRAS SDAS SOFTWARE INTERFACE SPECIFICATION(SIS) #623-94/NO. DS01
COMMENT  IRAS SDAS SOFTWARE INTERFACE SPECIFICATION(SIS) #623-94/NO. DS02
COMMENT  THE GUIDE TO IRAS POINTED OBSERVATIONS, NOVEMBER 1985
COMMENT  IRAS/SDAS SUBSYSTEM DESIGN SPEC.,DEEP SKY SURVEY SUBSYSTEM (#623-75)
COMMENT  ASTRON. ASTROPHYS. SUPPL. SER. 44,(1981) 363-370(RE:FITS)
END