NAME
wcsfix - corrects World Coordinate Systems of a FITS file
SYNOPSIS
wcsfix fits_file [change] [radius=2] [minsig=500] [mag=15] [minmatch=3] [fwhm=0.5] [over=1.5] [nofind] [nostars] [debug]
DESCRIPTION
wcsfix takes the FITS image and corrects the
WCS information
by pattern matching to known stars.
It does it in the following steps
- generates a file of the gaia stars near the target object
- generates a star list from these coordinate
- uses stars to find the stars in the image
- uses match to find the approximate offset
- uses astrom to find the plate solution
- updates the FITS header
If the file specifies and ObjectID.
HEADERS
The following header items are added to the image.
OPTIONS
fwhm= sets the minimum fwhm of the detected stars.
The default is 0.5 pixel.
change - updates the constants in the header.
extra= - expands the size of the box to window the stars in pixels.
nofind - doesn't look up new coordinates
nofind - doesn't find stars
minsig= - changes minimum star finder (default:500).
minmatch= - changes minimum number of star
matches (default:3).
If one is used the scale and rotation are kept the same
and only the brightest star is used to set CRVAL1, and
CRVAL2.
mag= - changes minimum magnitude (default:15).
over= - changes the overfinding distance factor (default:1.5).
This increases the search radius, by this factor.
radius= - changes match search radius in pixels for determining
the first match (default:40).
debug - more printout
Program index