source: trunk/FACT++/sofa/src/fk52h.c@ 18365

Last change on this file since 18365 was 18346, checked in by tbretz, 10 years ago
File size: 7.2 KB
Line 
1#include "sofa.h"
2
3void iauFk52h(double r5, double d5,
4 double dr5, double dd5, double px5, double rv5,
5 double *rh, double *dh,
6 double *drh, double *ddh, double *pxh, double *rvh)
7/*
8** - - - - - - - - -
9** i a u F k 5 2 h
10** - - - - - - - - -
11**
12** Transform FK5 (J2000.0) star data into the Hipparcos system.
13**
14** This function is part of the International Astronomical Union's
15** SOFA (Standards Of Fundamental Astronomy) software collection.
16**
17** Status: support function.
18**
19** Given (all FK5, equinox J2000.0, epoch J2000.0):
20** r5 double RA (radians)
21** d5 double Dec (radians)
22** dr5 double proper motion in RA (dRA/dt, rad/Jyear)
23** dd5 double proper motion in Dec (dDec/dt, rad/Jyear)
24** px5 double parallax (arcsec)
25** rv5 double radial velocity (km/s, positive = receding)
26**
27** Returned (all Hipparcos, epoch J2000.0):
28** rh double RA (radians)
29** dh double Dec (radians)
30** drh double proper motion in RA (dRA/dt, rad/Jyear)
31** ddh double proper motion in Dec (dDec/dt, rad/Jyear)
32** pxh double parallax (arcsec)
33** rvh double radial velocity (km/s, positive = receding)
34**
35** Notes:
36**
37** 1) This function transforms FK5 star positions and proper motions
38** into the system of the Hipparcos catalog.
39**
40** 2) The proper motions in RA are dRA/dt rather than
41** cos(Dec)*dRA/dt, and are per year rather than per century.
42**
43** 3) The FK5 to Hipparcos transformation is modeled as a pure
44** rotation and spin; zonal errors in the FK5 catalog are not
45** taken into account.
46**
47** 4) See also iauH2fk5, iauFk5hz, iauHfk5z.
48**
49** Called:
50** iauStarpv star catalog data to space motion pv-vector
51** iauFk5hip FK5 to Hipparcos rotation and spin
52** iauRxp product of r-matrix and p-vector
53** iauPxp vector product of two p-vectors
54** iauPpp p-vector plus p-vector
55** iauPvstar space motion pv-vector to star catalog data
56**
57** Reference:
58**
59** F.Mignard & M.Froeschle, Astron. Astrophys. 354, 732-739 (2000).
60**
61** This revision: 2013 June 18
62**
63** SOFA release 2015-02-09
64**
65** Copyright (C) 2015 IAU SOFA Board. See notes at end.
66*/
67{
68 int i;
69 double pv5[2][3], r5h[3][3], s5h[3], wxp[3], vv[3], pvh[2][3];
70
71/* FK5 barycentric position/velocity pv-vector (normalized). */
72 iauStarpv(r5, d5, dr5, dd5, px5, rv5, pv5);
73
74/* FK5 to Hipparcos orientation matrix and spin vector. */
75 iauFk5hip(r5h, s5h);
76
77/* Make spin units per day instead of per year. */
78 for ( i = 0; i < 3; s5h[i++] /= 365.25 );
79
80/* Orient the FK5 position into the Hipparcos system. */
81 iauRxp(r5h, pv5[0], pvh[0]);
82
83/* Apply spin to the position giving an extra space motion component. */
84 iauPxp(pv5[0], s5h, wxp);
85
86/* Add this component to the FK5 space motion. */
87 iauPpp(wxp, pv5[1], vv);
88
89/* Orient the FK5 space motion into the Hipparcos system. */
90 iauRxp(r5h, vv, pvh[1]);
91
92/* Hipparcos pv-vector to spherical. */
93 iauPvstar(pvh, rh, dh, drh, ddh, pxh, rvh);
94
95 return;
96
97/*----------------------------------------------------------------------
98**
99** Copyright (C) 2015
100** Standards Of Fundamental Astronomy Board
101** of the International Astronomical Union.
102**
103** =====================
104** SOFA Software License
105** =====================
106**
107** NOTICE TO USER:
108**
109** BY USING THIS SOFTWARE YOU ACCEPT THE FOLLOWING SIX TERMS AND
110** CONDITIONS WHICH APPLY TO ITS USE.
111**
112** 1. The Software is owned by the IAU SOFA Board ("SOFA").
113**
114** 2. Permission is granted to anyone to use the SOFA software for any
115** purpose, including commercial applications, free of charge and
116** without payment of royalties, subject to the conditions and
117** restrictions listed below.
118**
119** 3. You (the user) may copy and distribute SOFA source code to others,
120** and use and adapt its code and algorithms in your own software,
121** on a world-wide, royalty-free basis. That portion of your
122** distribution that does not consist of intact and unchanged copies
123** of SOFA source code files is a "derived work" that must comply
124** with the following requirements:
125**
126** a) Your work shall be marked or carry a statement that it
127** (i) uses routines and computations derived by you from
128** software provided by SOFA under license to you; and
129** (ii) does not itself constitute software provided by and/or
130** endorsed by SOFA.
131**
132** b) The source code of your derived work must contain descriptions
133** of how the derived work is based upon, contains and/or differs
134** from the original SOFA software.
135**
136** c) The names of all routines in your derived work shall not
137** include the prefix "iau" or "sofa" or trivial modifications
138** thereof such as changes of case.
139**
140** d) The origin of the SOFA components of your derived work must
141** not be misrepresented; you must not claim that you wrote the
142** original software, nor file a patent application for SOFA
143** software or algorithms embedded in the SOFA software.
144**
145** e) These requirements must be reproduced intact in any source
146** distribution and shall apply to anyone to whom you have
147** granted a further right to modify the source code of your
148** derived work.
149**
150** Note that, as originally distributed, the SOFA software is
151** intended to be a definitive implementation of the IAU standards,
152** and consequently third-party modifications are discouraged. All
153** variations, no matter how minor, must be explicitly marked as
154** such, as explained above.
155**
156** 4. You shall not cause the SOFA software to be brought into
157** disrepute, either by misuse, or use for inappropriate tasks, or
158** by inappropriate modification.
159**
160** 5. The SOFA software is provided "as is" and SOFA makes no warranty
161** as to its use or performance. SOFA does not and cannot warrant
162** the performance or results which the user may obtain by using the
163** SOFA software. SOFA makes no warranties, express or implied, as
164** to non-infringement of third party rights, merchantability, or
165** fitness for any particular purpose. In no event will SOFA be
166** liable to the user for any consequential, incidental, or special
167** damages, including any lost profits or lost savings, even if a
168** SOFA representative has been advised of such damages, or for any
169** claim by any third party.
170**
171** 6. The provision of any version of the SOFA software under the terms
172** and conditions specified herein does not imply that future
173** versions will also be made available under the same terms and
174** conditions.
175*
176** In any published work or commercial product which uses the SOFA
177** software directly, acknowledgement (see www.iausofa.org) is
178** appreciated.
179**
180** Correspondence concerning SOFA software should be addressed as
181** follows:
182**
183** By email: sofa@ukho.gov.uk
184** By post: IAU SOFA Center
185** HM Nautical Almanac Office
186** UK Hydrographic Office
187** Admiralty Way, Taunton
188** Somerset, TA1 2DN
189** United Kingdom
190**
191**--------------------------------------------------------------------*/
192}
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