IRAS Large Optical Galaxies Images FormatTable 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)
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