Primary Header¶
The PRIMARY header of this file only includes the minimum information necessary to describe what exposures should be corrected by this reference file and how it was generated. A full listing of the PRIMARY header includes:
SIMPLE = T / Fits standard
BITPIX = 16 / Bits per pixel
NAXIS = 0 / Number of axes
EXTEND = T / File may contain extensions
ORIGIN = 'NOAO-IRAF FITS Image Kernel July 2003' / FITS file originator
IRAF-TLM= '2011-09-09T13:24:40'
NEXTEND = 4 / Number of standard extensions
DATE = '2010-04-02T19:53:08'
FILENAME= 'v971826aj_npl.fits' / name of file
FILETYPE= 'DXY GRID' / type of data found in data file
OBSTYPE = 'IMAGING ' / type of observation
TELESCOP= 'HST' / telescope used to acquire data
INSTRUME= 'ACS ' / identifier for instrument used to acquire data
DETECTOR= 'WFC' / detector in use: WFC, HRC, or SBC
FILTER1 = 'F475W ' / element selected from filter wheel 1
FILTER2 = 'CLEAR2L ' / element selected from filter wheel 2
USEAFTER= 'Mar 01 2002 00:00:00'
COMMENT = 'NPOL calibration file created by Ray A. Lucas 29 APR 2010'
DESCRIP = 'Residual geometric distortion file for use with astrodrizzle-------'
PEDIGREE= 'INFLIGHT 11/11/2002 11/11/2002'
HISTORY Non-polynomial offset file generated from qbu16420j_dxy.fits
HISTORY Only added to the flt.fits file and used in coordinate
HISTORY transformations if the npol reference filename is specified in
HISTORY the header. The offsets are copied from the reference file into
HISTORY two arrays for each chip. Each array is stored as a 65x33 pixel
HISTORY image that gets interpolated up to the full chip size. Two new
HISTORY extensions for each chip are also appended to the flt file
HISTORY (WCSDVARR).
HISTORY qbu16420j_npl.fits renamed to v9615069j_npl.fits on Sep 6 2011
HISTORY v9615069j_npl.fits renamed to v971826aj_npl.fits on Sep 7 2011