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Next: Discussion of Example 2 Up: Examples of FITS Headers Previous: Discussion of Example 1

Example 2:  M87 and Jet (KPNO)

(Note: The first two lines following are provided to help the reader determine column numbers. They are not part of FITS headers.)

000000000111111111122222222223333333333444444444455555555556666666666777
123456789012345678901234567890123456789012345678901234567890123456789012
SIMPLE  =                    T  /  FITS TAPE WRITTEN AT KPNO, 04/18/80. 
BITPIX  =                   32  /  4-BYTE, 2-S COMPLEMENT INTEGERS. 
NAXIS   =                    2  /  NUMBER OF AXES. 
NAXIS1  =                  256  /  NUMBER OF PIXELS PER ROW. 
NAXIS2  =                  256  /  NUMBER OF ROWS. 
BSCALE  =          1.00000E-06  /  PHYSICAL=INTEGER*BSCALE+BZERO. 
BZERO   =                   0.  / 
BLANK   =          -2147483648  /  INTEGER VALUE FOR BLANK PIXEL. 

IPPS-RF = 'D      /013'         /  RASTER LFN/RASTER ORDINAL. 
IPPS-ID = 'N4486 NUCLEUS AND JET 4350 [9 BAD PIXELS BLANKED]        ' / 
IPPS-B/P=                   30  /  BITS/PIXEL OF IPPS RASTER. 
IPPS-MIN=         3.700018E-02  /  MINIMUM VALUE IN RASTER. 
IPPS-MAX=              1.19825  /  MAXIMUM VALUE IN RASTER. 
ORIGIN  = 'KPNO    -- WFITS OF 04/17/80.' / 
DATE    = '18/04/80'                             / 
TIME    = '10.11.54' 
JOBNAME = 'DCWGF27 ' 
COMMENT   THIS FILE TESTS THE 32-BIT PIXEL FORMAT. 
COMMENT   IT ALSO TESTS THE BLANK PIXEL CONVENTION. THERE ARE 9 BLANKS IN THIS 
COMMENT   IMAGE. THEY ARE A DETECTOR BLEMISH AREA. NOT ALL OF THE BLEMISH HAS
COMMENT   BEEN BLANKED. 

OBJECT  = 'NGC4486  =M87 AND JET' / 
TELESCOP= 'MAYALL4M'           / MAYALL 4-METER TELESCOPE AT KITT PEAK.
INSTRUME= 'VIDEOCAM - MAYALL 4M CASSEGRAIN' / 

COMMENT   THE KPNO "VIDEO CAMERA" IS AN INTEGRATING DIGITAL TELEVISION SYSTEM
COMMENT   WHICH USES AN  RCA ISIT VIDICON TUBE AND ACCUMULATES THE IMAGE IN 
COMMENT   A 256-SQUARE 20-BIT RAM DURING THE INTEGRATION. 
COMMENT   THIS IMAGE HAS BEEN CORRECTED FOR THE DARK CURRENT AND GAIN VARIATIONS
COMMENT   ACROSS THE FIELD. I.E., THE DARK IMAGE WAS SUBTRACTED, AND THE FLAT 
COMMENT   FIELD IMAGE WAS DIVIDED INTO THE RAW IMAGE. BECAUSE THE FLAT WAS NOT 
COMMENT   NORMALIZED IN THIS CASE, THE RESULTING RATIO IMAGE IS OF ORDER UNITY.
COMMENT   THIS IS A QUANTUM NOISE LIMITED IMAGE IN RELATIVE INTENSITY UNITS. 
COMMENT   THE GEOMETRY OF THIS IMAGE HAS NOT BEEN CORRECTED FOR THE PINCUSHION 
COMMENT   DISTORTION OF THE VIDEO CAMERA. 

END
(33 card images of ASCII blanks)