source: trunk/FACT++/erfa/src/h2fk5.c@ 20041

Last change on this file since 20041 was 18921, checked in by tbretz, 8 years ago
Updated to ERFA 1.4.0
File size: 6.0 KB
Line 
1#include "erfa.h"
2
3void eraH2fk5(double rh, double dh,
4 double drh, double ddh, double pxh, double rvh,
5 double *r5, double *d5,
6 double *dr5, double *dd5, double *px5, double *rv5)
7/*
8** - - - - - - - - -
9** e r a H 2 f k 5
10** - - - - - - - - -
11**
12** Transform Hipparcos star data into the FK5 (J2000.0) system.
13**
14** Given (all Hipparcos, epoch J2000.0):
15** rh double RA (radians)
16** dh double Dec (radians)
17** drh double proper motion in RA (dRA/dt, rad/Jyear)
18** ddh double proper motion in Dec (dDec/dt, rad/Jyear)
19** pxh double parallax (arcsec)
20** rvh double radial velocity (km/s, positive = receding)
21**
22** Returned (all FK5, equinox J2000.0, epoch J2000.0):
23** r5 double RA (radians)
24** d5 double Dec (radians)
25** dr5 double proper motion in RA (dRA/dt, rad/Jyear)
26** dd5 double proper motion in Dec (dDec/dt, rad/Jyear)
27** px5 double parallax (arcsec)
28** rv5 double radial velocity (km/s, positive = receding)
29**
30** Notes:
31**
32** 1) This function transforms Hipparcos star positions and proper
33** motions into FK5 J2000.0.
34**
35** 2) The proper motions in RA are dRA/dt rather than
36** cos(Dec)*dRA/dt, and are per year rather than per century.
37**
38** 3) The FK5 to Hipparcos transformation is modeled as a pure
39** rotation and spin; zonal errors in the FK5 catalog are not
40** taken into account.
41**
42** 4) See also eraFk52h, eraFk5hz, eraHfk5z.
43**
44** Called:
45** eraStarpv star catalog data to space motion pv-vector
46** eraFk5hip FK5 to Hipparcos rotation and spin
47** eraRv2m r-vector to r-matrix
48** eraRxp product of r-matrix and p-vector
49** eraTrxp product of transpose of r-matrix and p-vector
50** eraPxp vector product of two p-vectors
51** eraPmp p-vector minus p-vector
52** eraPvstar space motion pv-vector to star catalog data
53**
54** Reference:
55**
56** F.Mignard & M.Froeschle, Astron. Astrophys. 354, 732-739 (2000).
57**
58** Copyright (C) 2013-2017, NumFOCUS Foundation.
59** Derived, with permission, from the SOFA library. See notes at end of file.
60*/
61{
62 int i;
63 double pvh[2][3], r5h[3][3], s5h[3], sh[3], wxp[3], vv[3], pv5[2][3];
64
65
66/* Hipparcos barycentric position/velocity pv-vector (normalized). */
67 eraStarpv(rh, dh, drh, ddh, pxh, rvh, pvh);
68
69/* FK5 to Hipparcos orientation matrix and spin vector. */
70 eraFk5hip(r5h, s5h);
71
72/* Make spin units per day instead of per year. */
73 for ( i = 0; i < 3; s5h[i++] /= 365.25 );
74
75/* Orient the spin into the Hipparcos system. */
76 eraRxp(r5h, s5h, sh);
77
78/* De-orient the Hipparcos position into the FK5 system. */
79 eraTrxp(r5h, pvh[0], pv5[0]);
80
81/* Apply spin to the position giving an extra space motion component. */
82 eraPxp(pvh[0], sh, wxp);
83
84/* Subtract this component from the Hipparcos space motion. */
85 eraPmp(pvh[1], wxp, vv);
86
87/* De-orient the Hipparcos space motion into the FK5 system. */
88 eraTrxp(r5h, vv, pv5[1]);
89
90/* FK5 pv-vector to spherical. */
91 eraPvstar(pv5, r5, d5, dr5, dd5, px5, rv5);
92
93 return;
94
95}
96/*----------------------------------------------------------------------
97**
98**
99** Copyright (C) 2013-2017, NumFOCUS Foundation.
100** All rights reserved.
101**
102** This library is derived, with permission, from the International
103** Astronomical Union's "Standards of Fundamental Astronomy" library,
104** available from http://www.iausofa.org.
105**
106** The ERFA version is intended to retain identical functionality to
107** the SOFA library, but made distinct through different function and
108** file names, as set out in the SOFA license conditions. The SOFA
109** original has a role as a reference standard for the IAU and IERS,
110** and consequently redistribution is permitted only in its unaltered
111** state. The ERFA version is not subject to this restriction and
112** therefore can be included in distributions which do not support the
113** concept of "read only" software.
114**
115** Although the intent is to replicate the SOFA API (other than
116** replacement of prefix names) and results (with the exception of
117** bugs; any that are discovered will be fixed), SOFA is not
118** responsible for any errors found in this version of the library.
119**
120** If you wish to acknowledge the SOFA heritage, please acknowledge
121** that you are using a library derived from SOFA, rather than SOFA
122** itself.
123**
124**
125** TERMS AND CONDITIONS
126**
127** Redistribution and use in source and binary forms, with or without
128** modification, are permitted provided that the following conditions
129** are met:
130**
131** 1 Redistributions of source code must retain the above copyright
132** notice, this list of conditions and the following disclaimer.
133**
134** 2 Redistributions in binary form must reproduce the above copyright
135** notice, this list of conditions and the following disclaimer in
136** the documentation and/or other materials provided with the
137** distribution.
138**
139** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
140** the International Astronomical Union nor the names of its
141** contributors may be used to endorse or promote products derived
142** from this software without specific prior written permission.
143**
144** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
145** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
146** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
147** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
148** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
149** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
150** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
151** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
152** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
153** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
154** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
155** POSSIBILITY OF SUCH DAMAGE.
156**
157*/
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