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Diffstat (limited to 'ast/pal/palAmpqk.c')
-rw-r--r-- | ast/pal/palAmpqk.c | 128 |
1 files changed, 0 insertions, 128 deletions
diff --git a/ast/pal/palAmpqk.c b/ast/pal/palAmpqk.c deleted file mode 100644 index 1e0681a..0000000 --- a/ast/pal/palAmpqk.c +++ /dev/null @@ -1,128 +0,0 @@ -/* -*+ -* Name: -* palAmpqk - -* Purpose: -* Convert star RA,Dec from geocentric apparent to mean place. - -* Language: -* Starlink ANSI C - -* Type of Module: -* Library routine - -* Invocation: -* void palAmpqk ( double ra, double da, double amprms[21], -* double *rm, double *dm ) - -* Arguments: -* ra = double (Given) -* Apparent RA (radians). -* da = double (Given) -* Apparent Dec (radians). -* amprms = double[21] (Given) -* Star-independent mean-to-apparent parameters (see palMappa): -* (0) time interval for proper motion (Julian years) -* (1-3) barycentric position of the Earth (AU) -* (4-6) not used -* (7) not used -* (8-10) abv: barycentric Earth velocity in units of c -* (11) sqrt(1-v*v) where v=modulus(abv) -* (12-20) precession/nutation (3,3) matrix -* rm = double (Returned) -* Mean RA (radians). -* dm = double (Returned) -* Mean Dec (radians). - -* Description: -* Convert star RA,Dec from geocentric apparent to mean place. The "mean" -* coordinate system is in fact close to ICRS. Use of this function -* is appropriate when efficiency is important and where many star -* positions are all to be transformed for one epoch and equinox. The -* star-independent parameters can be obtained by calling the palMappa -* function. - -* Authors: -* PTW: Pat Wallace (STFC) -* {enter_new_authors_here} - -* History: -* 2012-02-13 (PTW): -* Initial version. -* Adapted with permission from the Fortran SLALIB library. -* {enter_further_changes_here} - -* Copyright: -* Copyright (C) 2000 Rutherford Appleton Laboratory -* Copyright (C) 2012 Science and Technology Facilities Council. -* All Rights Reserved. - -* Licence: -* This program is free software: you can redistribute it and/or -* modify it under the terms of the GNU Lesser General Public -* License as published by the Free Software Foundation, either -* version 3 of the License, or (at your option) any later -* version. -* -* This program is distributed in the hope that it will be useful, -* but WITHOUT ANY WARRANTY; without even the implied warranty of -* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -* GNU Lesser General Public License for more details. -* -* You should have received a copy of the GNU Lesser General -* License along with this program. If not, see -* <http://www.gnu.org/licenses/>. - -* Bugs: -* {note_any_bugs_here} -*- -*/ - -#include "pal.h" -#include "pal1sofa.h" - -void palAmpqk ( double ra, double da, double amprms[21], double *rm, - double *dm ){ - -/* Local Variables: */ - double ab1; /* sqrt(1-v*v) where v=modulus of Earth vel */ - double abv[3]; /* Earth velocity wrt SSB (c, FK5) */ - double p1[3], p2[3], p3[3]; /* work vectors */ - double ab1p1, p1dv, p1dvp1, w; - int i, j; - -/* Unpack some of the parameters */ - ab1 = amprms[11]; - for( i = 0; i < 3; i++ ) { - abv[i] = amprms[i + 8]; - } - -/* Apparent RA,Dec to Cartesian */ - eraS2c( ra, da, p3 ); - -/* Precession and nutation */ - eraTrxp( (double(*)[3]) &rms[12], p3, p2 ); - -/* Aberration */ - ab1p1 = ab1 + 1.0; - for( i = 0; i < 3; i++ ) { - p1[i] = p2[i]; - } - for( j = 0; j < 2; j++ ) { - p1dv = eraPdp( p1, abv ); - p1dvp1 = 1.0 + p1dv; - w = 1.0 + p1dv / ab1p1; - for( i = 0; i < 3; i++ ) { - p1[i] = ( p1dvp1 * p2[i] - w * abv[i] ) / ab1; - } - eraPn( p1, &w, p3 ); - for( i = 0; i < 3; i++ ) { - p1[i] = p3[i]; - } - } - -/* Mean RA,Dec */ - eraC2s( p1, rm, dm ); - *rm = eraAnp( *rm ); -} |