#****************************************************************************** # 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 Name: ESO-VLT-DIC.VIRCAM_WCS Scope: VIRCAM Source: ESO VLT Version Control: @(#) $Id: 1.24 $ Revision: $Revision: 0.5 $ Date: 2004-07-27 Status: Development Description: VISTA IR Camera World-Coordinate System keywords Parameter Name: RADECSYS Class: header Context: FITS Type: string Value Format: %s Unit: Comment Format: Name of celestial reference frame. Description: Standard reference-frame name, will normally be 'ICRS'. Note, this implies the EQUINOX keyword is absent. Parameter Name: EQUINOX Class: header Context: FITS Type: double Value Format: %.1f Unit: Year Comment Format: Equinox of celestial reference frame [Year]. Description: Equinox of reference frame, required for precessed reference frames, but obsolete for International Coordinate Reference System. Parameter Name: CTYPE1 Class: header Context: FITS Type: string Value Format: %s Unit: Comment Format: Type of celestial axis 1. Description: WCS first coordinate type, will be 'RA---ZPN' for VISTA optical projection. Parameter Name: CTYPE2 Class: header Context: FITS Type: string Value Format: %s Unit: Comment Format: Type of celestial axis 2. Description: WCS first coordinate type, will be 'DEC--ZPN' for VISTA optical projection. Parameter Name: CRPIX1 Class: header Context: FITS Type: double Value Format: %.2f Unit: pixel Comment Format: Pixel coordinate of reference in axis 1 [pixel]. Description: 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. Parameter Name: CRPIX2 Class: header Context: FITS Type: double Value Format: %.2f Unit: pixel Comment Format: Pixel coordinate of reference in axis 2 [pixel]. Description: 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. Parameter Name: CRVAL1 Class: header Context: FITS Type: double Value Format: %.12f Unit: degree Comment Format: RA of reference point [degree]. Description: Right Ascension of reference point, will be referred to the rotation centre. Parameter Name: CRVAL2 Class: header Context: FITS Type: double Value Format: %.12f Unit: degree Comment Format: Dec of reference point [degree]. Description: Declination of reference point, will be referred to the rotation centre. Parameter Name: CD1_1 Class: header Context: FITS Type: double Value Format: %12E Unit: Comment Format: Transformation matrix element. Description: Near unit-matrix used for rotation and shear. Parameter Name: CD1_2 Class: header Context: FITS Type: double Value Format: %12E Unit: Comment Format: Transformation matrix element. Description: Near unit-matrix used for rotation and shear. Parameter Name: CD2_1 Class: header Context: FITS Type: double Value Format: %12E Unit: Comment Format: Transformation matrix element. Description: Near unit-matrix used for rotation and shear. Parameter Name: CD2_2 Class: header Context: FITS Type: double Value Format: %12E Unit: Comment Format: Transformation matrix element. Description: Near unit-matrix used for rotation and shear. Parameter Name: PV2_1 Class: header Context: FITS Type: double Value Format: %12E Unit: dimensionless Comment Format: linear term in ZPN [dimensionless]. Description: The Zenithal Polynomial (ZPN) projection requires PVi_j attached to the latitude coordinate (2). All default to zero so need PV2_1 = 1.0 Parameter Name: PV2_2 Class: header Context: FITS Type: double Value Format: %12E Unit: dimensionless Comment Format: quadratic term in ZPN [dimensionless]. Description: 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 Parameter Name: PV2_3 Class: header Context: FITS Type: double Value Format: %12E Unit: dimensionless Comment Format: cubic term in ZPN [dimensionless]. Description: The ZPN projection requires PVi_j attached to the latitude coordinate (2). PV2_3 is the cubic term (arising from the wide-field corrector). Parameter Name: PV2_4 Class: header Context: FITS Type: double Value Format: %12E Unit: dimensionless Comment Format: forth-order term in ZPN [dimensionless]. Description: 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. Parameter Name: PV2_5 Class: header Context: FITS Type: double Value Format: %12E Unit: dimensionless Comment Format: fifth-order term in ZPN [dimensionless]. Description: 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.