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Diffstat (limited to 'ast/erfa/hfk5z.c')
| -rw-r--r-- | ast/erfa/hfk5z.c | 184 |
1 files changed, 0 insertions, 184 deletions
diff --git a/ast/erfa/hfk5z.c b/ast/erfa/hfk5z.c deleted file mode 100644 index 8824e96..0000000 --- a/ast/erfa/hfk5z.c +++ /dev/null @@ -1,184 +0,0 @@ -#include "erfa.h" - -void eraHfk5z(double rh, double dh, double date1, double date2, - double *r5, double *d5, double *dr5, double *dd5) -/* -** - - - - - - - - - -** e r a H f k 5 z -** - - - - - - - - - -** -** Transform a Hipparcos star position into FK5 J2000.0, assuming -** zero Hipparcos proper motion. -** -** Given: -** rh double Hipparcos RA (radians) -** dh double Hipparcos Dec (radians) -** date1,date2 double TDB date (Note 1) -** -** Returned (all FK5, equinox J2000.0, date date1+date2): -** r5 double RA (radians) -** d5 double Dec (radians) -** dr5 double FK5 RA proper motion (rad/year, Note 4) -** dd5 double Dec proper motion (rad/year, Note 4) -** -** Notes: -** -** 1) The TT date date1+date2 is a Julian Date, apportioned in any -** convenient way between the two arguments. For example, -** JD(TT)=2450123.7 could be expressed in any of these ways, -** among others: -** -** date1 date2 -** -** 2450123.7 0.0 (JD method) -** 2451545.0 -1421.3 (J2000 method) -** 2400000.5 50123.2 (MJD method) -** 2450123.5 0.2 (date & time method) -** -** The JD method is the most natural and convenient to use in -** cases where the loss of several decimal digits of resolution -** is acceptable. The J2000 method is best matched to the way -** the argument is handled internally and will deliver the -** optimum resolution. The MJD method and the date & time methods -** are both good compromises between resolution and convenience. -** -** 2) The proper motion in RA is dRA/dt rather than cos(Dec)*dRA/dt. -** -** 3) The FK5 to Hipparcos transformation is modeled as a pure rotation -** and spin; zonal errors in the FK5 catalogue are not taken into -** account. -** -** 4) It was the intention that Hipparcos should be a close -** approximation to an inertial frame, so that distant objects have -** zero proper motion; such objects have (in general) non-zero -** proper motion in FK5, and this function returns those fictitious -** proper motions. -** -** 5) The position returned by this function is in the FK5 J2000.0 -** reference system but at date date1+date2. -** -** 6) See also eraFk52h, eraH2fk5, eraFk5zhz. -** -** Called: -** eraS2c spherical coordinates to unit vector -** eraFk5hip FK5 to Hipparcos rotation and spin -** eraRxp product of r-matrix and p-vector -** eraSxp multiply p-vector by scalar -** eraRxr product of two r-matrices -** eraTrxp product of transpose of r-matrix and p-vector -** eraPxp vector product of two p-vectors -** eraPv2s pv-vector to spherical -** eraAnp normalize angle into range 0 to 2pi -** -** Reference: -** -** F.Mignard & M.Froeschle, 2000, Astron.Astrophys. 354, 732-739. -** -** Copyright (C) 2013-2016, NumFOCUS Foundation. -** Derived, with permission, from the SOFA library. See notes at end of file. -*/ -{ - double t, ph[3], r5h[3][3], s5h[3], sh[3], vst[3], - rst[3][3], r5ht[3][3], pv5e[2][3], vv[3], - w, r, v; - - -/* Time interval from fundamental epoch J2000.0 to given date (JY). */ - t = ((date1 - ERFA_DJ00) + date2) / ERFA_DJY; - -/* Hipparcos barycentric position vector (normalized). */ - eraS2c(rh, dh, ph); - -/* FK5 to Hipparcos orientation matrix and spin vector. */ - eraFk5hip(r5h, s5h); - -/* Rotate the spin into the Hipparcos system. */ - eraRxp(r5h, s5h, sh); - -/* Accumulated Hipparcos wrt FK5 spin over that interval. */ - eraSxp(t, s5h, vst); - -/* Express the accumulated spin as a rotation matrix. */ - eraRv2m(vst, rst); - -/* Rotation matrix: accumulated spin, then FK5 to Hipparcos. */ - eraRxr(r5h, rst, r5ht); - -/* De-orient & de-spin the Hipparcos position into FK5 J2000.0. */ - eraTrxp(r5ht, ph, pv5e[0]); - -/* Apply spin to the position giving a space motion. */ - eraPxp(sh, ph, vv); - -/* De-orient & de-spin the Hipparcos space motion into FK5 J2000.0. */ - eraTrxp(r5ht, vv, pv5e[1]); - -/* FK5 position/velocity pv-vector to spherical. */ - eraPv2s(pv5e, &w, d5, &r, dr5, dd5, &v); - *r5 = eraAnp(w); - - 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. -** -*/ |