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authorWilliam Joye <wjoye@cfa.harvard.edu>2018-09-21 17:02:41 (GMT)
committerWilliam Joye <wjoye@cfa.harvard.edu>2018-09-21 17:02:41 (GMT)
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-#include "erfa.h"
-
-void eraFk5hip(double r5h[3][3], double s5h[3])
-/*
-** - - - - - - - - - -
-** e r a F k 5 h i p
-** - - - - - - - - - -
-**
-** FK5 to Hipparcos rotation and spin.
-**
-** Returned:
-** r5h double[3][3] r-matrix: FK5 rotation wrt Hipparcos (Note 2)
-** s5h double[3] r-vector: FK5 spin wrt Hipparcos (Note 3)
-**
-** Notes:
-**
-** 1) This function models the FK5 to Hipparcos transformation as a
-** pure rotation and spin; zonal errors in the FK5 catalogue are
-** not taken into account.
-**
-** 2) The r-matrix r5h operates in the sense:
-**
-** P_Hipparcos = r5h x P_FK5
-**
-** where P_FK5 is a p-vector in the FK5 frame, and P_Hipparcos is
-** the equivalent Hipparcos p-vector.
-**
-** 3) The r-vector s5h represents the time derivative of the FK5 to
-** Hipparcos rotation. The units are radians per year (Julian,
-** TDB).
-**
-** Called:
-** eraRv2m r-vector to r-matrix
-**
-** Reference:
-**
-** F.Mignard & M.Froeschle, Astron. Astrophys. 354, 732-739 (2000).
-**
-** Copyright (C) 2013-2016, NumFOCUS Foundation.
-** Derived, with permission, from the SOFA library. See notes at end of file.
-*/
-{
- double v[3];
-
-/* FK5 wrt Hipparcos orientation and spin (radians, radians/year) */
- double epx, epy, epz;
- double omx, omy, omz;
-
-
- epx = -19.9e-3 * ERFA_DAS2R;
- epy = -9.1e-3 * ERFA_DAS2R;
- epz = 22.9e-3 * ERFA_DAS2R;
-
- omx = -0.30e-3 * ERFA_DAS2R;
- omy = 0.60e-3 * ERFA_DAS2R;
- omz = 0.70e-3 * ERFA_DAS2R;
-
-/* FK5 to Hipparcos orientation expressed as an r-vector. */
- v[0] = epx;
- v[1] = epy;
- v[2] = epz;
-
-/* Re-express as an r-matrix. */
- eraRv2m(v, r5h);
-
-/* Hipparcos wrt FK5 spin expressed as an r-vector. */
- s5h[0] = omx;
- s5h[1] = omy;
- s5h[2] = omz;
-
- return;
-
-}
-/*----------------------------------------------------------------------
-**
-**
-** Copyright (C) 2013-2016, NumFOCUS Foundation.
-** All rights reserved.
-**
-** This library is derived, with permission, from the International
-** Astronomical Union's "Standards of Fundamental Astronomy" library,
-** available from http://www.iausofa.org.
-**
-** The ERFA version is intended to retain identical functionality to
-** the SOFA library, but made distinct through different function and
-** file names, as set out in the SOFA license conditions. The SOFA
-** original has a role as a reference standard for the IAU and IERS,
-** and consequently redistribution is permitted only in its unaltered
-** state. The ERFA version is not subject to this restriction and
-** therefore can be included in distributions which do not support the
-** concept of "read only" software.
-**
-** Although the intent is to replicate the SOFA API (other than
-** replacement of prefix names) and results (with the exception of
-** bugs; any that are discovered will be fixed), SOFA is not
-** responsible for any errors found in this version of the library.
-**
-** If you wish to acknowledge the SOFA heritage, please acknowledge
-** that you are using a library derived from SOFA, rather than SOFA
-** itself.
-**
-**
-** TERMS AND CONDITIONS
-**
-** Redistribution and use in source and binary forms, with or without
-** modification, are permitted provided that the following conditions
-** are met:
-**
-** 1 Redistributions of source code must retain the above copyright
-** notice, this list of conditions and the following disclaimer.
-**
-** 2 Redistributions in binary form must reproduce the above copyright
-** notice, this list of conditions and the following disclaimer in
-** the documentation and/or other materials provided with the
-** distribution.
-**
-** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
-** the International Astronomical Union nor the names of its
-** contributors may be used to endorse or promote products derived
-** from this software without specific prior written permission.
-**
-** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
-** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
-** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
-** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
-** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
-** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-** POSSIBILITY OF SUCH DAMAGE.
-**
-*/