source: branches/FACT++_lidctrl_usb/erfa/src/fk5hip.c@ 19875

Last change on this file since 19875 was 18711, checked in by tbretz, 10 years ago
Updated to ERFA 1.3.0 (no relevant code change except the leap second at the beginning of 2017)
File size: 4.6 KB
Line 
1#include "erfa.h"
2
3void eraFk5hip(double r5h[3][3], double s5h[3])
4/*
5** - - - - - - - - - -
6** e r a F k 5 h i p
7** - - - - - - - - - -
8**
9** FK5 to Hipparcos rotation and spin.
10**
11** Returned:
12** r5h double[3][3] r-matrix: FK5 rotation wrt Hipparcos (Note 2)
13** s5h double[3] r-vector: FK5 spin wrt Hipparcos (Note 3)
14**
15** Notes:
16**
17** 1) This function models the FK5 to Hipparcos transformation as a
18** pure rotation and spin; zonal errors in the FK5 catalogue are
19** not taken into account.
20**
21** 2) The r-matrix r5h operates in the sense:
22**
23** P_Hipparcos = r5h x P_FK5
24**
25** where P_FK5 is a p-vector in the FK5 frame, and P_Hipparcos is
26** the equivalent Hipparcos p-vector.
27**
28** 3) The r-vector s5h represents the time derivative of the FK5 to
29** Hipparcos rotation. The units are radians per year (Julian,
30** TDB).
31**
32** Called:
33** eraRv2m r-vector to r-matrix
34**
35** Reference:
36**
37** F.Mignard & M.Froeschle, Astron. Astrophys. 354, 732-739 (2000).
38**
39** Copyright (C) 2013-2016, NumFOCUS Foundation.
40** Derived, with permission, from the SOFA library. See notes at end of file.
41*/
42{
43 double v[3];
44
45/* FK5 wrt Hipparcos orientation and spin (radians, radians/year) */
46 double epx, epy, epz;
47 double omx, omy, omz;
48
49
50 epx = -19.9e-3 * ERFA_DAS2R;
51 epy = -9.1e-3 * ERFA_DAS2R;
52 epz = 22.9e-3 * ERFA_DAS2R;
53
54 omx = -0.30e-3 * ERFA_DAS2R;
55 omy = 0.60e-3 * ERFA_DAS2R;
56 omz = 0.70e-3 * ERFA_DAS2R;
57
58/* FK5 to Hipparcos orientation expressed as an r-vector. */
59 v[0] = epx;
60 v[1] = epy;
61 v[2] = epz;
62
63/* Re-express as an r-matrix. */
64 eraRv2m(v, r5h);
65
66/* Hipparcos wrt FK5 spin expressed as an r-vector. */
67 s5h[0] = omx;
68 s5h[1] = omy;
69 s5h[2] = omz;
70
71 return;
72
73}
74/*----------------------------------------------------------------------
75**
76**
77** Copyright (C) 2013-2016, NumFOCUS Foundation.
78** All rights reserved.
79**
80** This library is derived, with permission, from the International
81** Astronomical Union's "Standards of Fundamental Astronomy" library,
82** available from http://www.iausofa.org.
83**
84** The ERFA version is intended to retain identical functionality to
85** the SOFA library, but made distinct through different function and
86** file names, as set out in the SOFA license conditions. The SOFA
87** original has a role as a reference standard for the IAU and IERS,
88** and consequently redistribution is permitted only in its unaltered
89** state. The ERFA version is not subject to this restriction and
90** therefore can be included in distributions which do not support the
91** concept of "read only" software.
92**
93** Although the intent is to replicate the SOFA API (other than
94** replacement of prefix names) and results (with the exception of
95** bugs; any that are discovered will be fixed), SOFA is not
96** responsible for any errors found in this version of the library.
97**
98** If you wish to acknowledge the SOFA heritage, please acknowledge
99** that you are using a library derived from SOFA, rather than SOFA
100** itself.
101**
102**
103** TERMS AND CONDITIONS
104**
105** Redistribution and use in source and binary forms, with or without
106** modification, are permitted provided that the following conditions
107** are met:
108**
109** 1 Redistributions of source code must retain the above copyright
110** notice, this list of conditions and the following disclaimer.
111**
112** 2 Redistributions in binary form must reproduce the above copyright
113** notice, this list of conditions and the following disclaimer in
114** the documentation and/or other materials provided with the
115** distribution.
116**
117** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
118** the International Astronomical Union nor the names of its
119** contributors may be used to endorse or promote products derived
120** from this software without specific prior written permission.
121**
122** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
123** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
124** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
125** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
126** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
127** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
128** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
129** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
130** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
131** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
132** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
133** POSSIBILITY OF SUCH DAMAGE.
134**
135*/
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