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/* |
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*+ |
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* Name: |
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* palPlanet |
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* Purpose: |
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* Approximate heliocentric position and velocity of major planet |
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* Language: |
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* Starlink ANSI C |
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* Type of Module: |
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* Library routine |
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* Invocation: |
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* void palPlanet ( double date, int np, double pv[6], int *j ); |
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* Arguments: |
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* date = double (Given) |
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* TDB Modified Julian Date (JD-2400000.5). |
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* np = int (Given) |
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* planet (1=Mercury, 2=Venus, 3=EMB, 4=Mars, |
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* 5=Jupiter, 6=Saturn, 7=Uranus, 8=Neptune) |
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* pv = double [6] (Returned) |
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* heliocentric x,y,z,xdot,ydot,zdot, J2000, equatorial triad |
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* in units AU and AU/s. |
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* j = int * (Returned) |
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* - -2 = solution didn't converge. |
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* - -1 = illegal np (1-8) |
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* - 0 = OK |
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* - +1 = warning: year outside 1000-3000 |
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* Description: |
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* Calculates the approximate heliocentric position and velocity of |
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* the specified major planet. |
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* Authors: |
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* TIMJ: Tim Jenness (JAC, Hawaii) |
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* {enter_new_authors_here} |
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* Notes: |
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* - See SOFA/ERFA eraPlan94 for details |
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* - Note that Pluto is supported in SLA/F but not in this routine |
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* - Status -2 is equivalent to eraPlan94 status +2. |
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* - Note that velocity units here match the SLA/F documentation. |
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* History: |
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* 2012-03-07 (TIMJ): |
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* Initial version |
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* Adapted with permission from the Fortran SLALIB library. |
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* {enter_further_changes_here} |
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* Copyright: |
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* Copyright (C) 2012 Science and Technology Facilities Council. |
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* All Rights Reserved. |
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* Licence: |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License as |
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* published by the Free Software Foundation; either version 3 of |
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* the License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be |
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* useful, but WITHOUT ANY WARRANTY; without even the implied |
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
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* PURPOSE. See the GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, |
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* MA 02110-1301, USA. |
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* Bugs: |
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* {note_any_bugs_here} |
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*- |
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*/ |
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78
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#include "pal.h" |
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#include "palmac.h" |
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#include "pal1sofa.h" |
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82
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731
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void palPlanet ( double date, int np, double pv[6], int *j ) { |
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double erapv[2][3]; |
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85
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731
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*j = eraPlan94( PAL__MJD0, date, np, erapv ); |
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87
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/* Convert the outputs to the correct form and also correct AU/d |
88
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to AU/s */ |
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731
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pv[0] = erapv[0][0]; |
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731
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pv[1] = erapv[0][1]; |
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pv[2] = erapv[0][2]; |
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731
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pv[3] = erapv[1][0] / PAL__SPD; |
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731
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pv[4] = erapv[1][1] / PAL__SPD; |
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731
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pv[5] = erapv[1][2] / PAL__SPD; |
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96
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/* SLA compatibility for status */ |
97
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731
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50
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if (*j == 2) *j = -2; |
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731
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} |