#******************************************************************************
# E.S.O. - VLT project
#
# "@(#) $Id: dicVIRCAM_WCS.txt,v 1.24 2003/08/01 14:24:02 vltsccm Exp $"
#
# VIRCAM_WCS dictionaries
#
# Refer to appendix A of document VLT-SPE-ESO-17240-1676 for details.
#
# Note, the contents of this dictionary may end up in the VISTA TCS
# dictionary.
#
# who       when      what
# --------  --------  ----------------------------------------------
# pbunclark  2004-06-26  created.
#

#******************************************************************************
#
# Notes
# 1) The letters within () indicate the Class that keyword belongs to:
#    c = config
#    h = header
#    l = conf-log
#    p = private
#    s = setup
#    o = ops-log
#

DICTIONARY VIRCAM_WCS "VIRCAM" "VISTA IR Camera World-Coordinate System keywords"
REVISION		"$Revision: 0.5 $"
CONTEXT			"FITS"


RADECSYS	%s	Name of celestial reference frame (h).
			Standard reference-frame name, will normally be 'ICRS'.
			Note, this implies the EQUINOX keyword is absent.
EQUINOX		%.1f	Equinox of celestial reference frame [Year] (h).
			Equinox of reference frame, required for precessed
			reference
			frames, but obsolete for International Coordinate
			Reference
			System.
CTYPE1		%s	Type of celestial axis 1 (h).
			WCS first coordinate type, will be 'RA---ZPN' for VISTA
			optical projection.
CTYPE2		%s	Type of celestial axis 2 (h).
			WCS first coordinate type, will be 'DEC--ZPN' for VISTA
			optical projection.
CRPIX1		%.2f	Pixel coordinate of reference in axis 1 [pixel] (h).
			Position in pixel space along image-frame axis 1, in
			theory would be refer to the optical centre, but for
			practical reasons will be the rotator centre.
CRPIX2		%.2f	Pixel coordinate of reference in axis 2 [pixel] (h).
			Position in pixel space along image-frame axis 2, in
			theory would be refer to the optical centre, but for
			practical reasons will be the rotator centre.
CRVAL1		%.12f	RA of reference point [degree] (h).
			Right Ascension of reference point, will be referred to
			the rotation centre.
CRVAL2		%.12f	Dec of reference point [degree] (h).
			Declination of reference point, will be referred to
			the rotation centre.
CD1_1		%12E	Transformation matrix element (h).
			Near unit-matrix used for rotation and shear.
CD1_2		%12E	Transformation matrix element (h).
			Near unit-matrix used for rotation and shear.
CD2_1		%12E	Transformation matrix element (h).
			Near unit-matrix used for rotation and shear.
CD2_2		%12E	Transformation matrix element (h).
			Near unit-matrix used for rotation and shear.
PV2_1		%12E	linear term in ZPN [dimensionless] (h).
			The Zenithal Polynomial (ZPN) projection requires PVi_j
			attached to the latitude coordinate (2). All default to
			zero so need PV2_1 = 1.0
PV2_2		%12E	quadratic term in ZPN [dimensionless] (h).
			The Zenithal Polynomial (ZPN) projection requires PVi_j
			attached to the latitude coordinate (2). All default to
			zero so probably won't need PV2_2 = 1.0
PV2_3		%12E	cubic term in ZPN [dimensionless] (h).
			The ZPN projection requires PVi_j attached to the
			latitude coordinate (2). PV2_3 is the cubic term
			(arising from the wide-field corrector).
PV2_4		%12E	forth-order term in ZPN [dimensionless] (h).
			The Zenithal Polynomial (ZPN) projection requires PVi_j
			attached to the latitude coordinate (2). All default to
			zero so probably won't need PV2_4.
PV2_5		%12E	fifth-order term in ZPN [dimensionless] (h).
			The Zenithal Polynomial (ZPN) projection requires PVi_j
			attached to the latitude coordinate (2). All default to
			zero so probably won't need PV2_5.