wcsfit

wcsfit: WCS fitting

Describes version 1.0.42

wcsfit matches up objects from an image with astrometric position standards. The transformation between the cartesian and equatorial coordinates is fit. The results are written in both the image header and the catalogue table header in the standard FITS header keywords. A FITS image and an imcore generated catalogue are required input. By default the objects in the catalogue are matched to 2MASS standards which is extracted from the CASU mirror of VizieR. This can be changed by using the optional switches described below.

If the input image is a multiextension FITS file, then the number of extensions in the input catalogue must match with the number of image extensions. wcsfit will fit each image extension in turn.

SYNOPSIS

wcsfit infile incat

ARGUMENTS

infile
Input FITS image.
incat
Input FITS table which has been generated by imcore with sources extracted from infile

OPTIONS

The following options are supported. Default values are specified after the equal sign.

--catsrc=viz2mass
The source of the standard stars used in the astrometric fit. The following values are supported:
  • viz2mass: 2MASS standards are extracted from a VizieR distribution defined by --site.
  • vizusnob: USNOB standards are extracted from a VizieR distribution defined by --site.
  • vizlandolt: Landolt standards are extracted from a VizieR distribution defined by --site.
  • local2mass: a local FITS copy of the 2MASS catalogue is searched. The full path to the FITS files is defined by --catpath.
  • localusnob: a local copy of the USNOB catalogue is searched. The full path to the .cat and .acc files is defined by --catpath.
  • localfits: a locally available FITS table is searched. The full path to this table is given by --catpath. The only columns required in the table are ra and dec, and both must be in degrees.
--site
If a VizieR distribution is used by --catsrc, this defines the site of the distribution. Two values are supported: casu uses the VizieR mirror at CASU in Cambridge and CDS uses the original VizieR at CDS.
--catpath
If a local option is given for --catsrc, this defines the full path to the file or files.