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core/planetsephems/tass17.h

00001 /************************************************************************
00002 
00003 The TASS 1.7 theory of the Saturnian satellites including HYPERION
00004 by Alain VIENNE and Luc DURIEZ can be found at
00005 ftp://ftp.imcce.fr/pub/ephem/satel/tass17
00006 
00007 I (Johannes Gajdosik) have just taken the Fortran code and data
00008 obtained from above and rearranged it into this piece of software.
00009 
00010 I can neigther allow nor forbid the usage of the TASS 1.7 theory.
00011 The copyright notice below covers not the work of Alain VIENNE and Luc DURIEZ
00012 but just my work, that is the compilation of the TASS 1.7 theory
00013 into the software supplied in this file.
00014 
00015 
00016 Copyright (c) 2005 Johannes Gajdosik
00017 
00018 Permission is hereby granted, free of charge, to any person obtaining a
00019 copy of this software and associated documentation files (the "Software"),
00020 to deal in the Software without restriction, including without limitation
00021 the rights to use, copy, modify, merge, publish, distribute, sublicense,
00022 and/or sell copies of the Software, and to permit persons to whom the
00023 Software is furnished to do so, subject to the following conditions:
00024 
00025 The above copyright notice and this permission notice shall be included
00026 in all copies or substantial portions of the Software.
00027 
00028 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00029 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00030 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00031 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00032 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00033 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
00034 SOFTWARE.
00035 
00036 This is an implementation of the TASS 1.7 theory.
00037 My modifications are:
00038 1) do not calculate constant terms at runtime but beforehand
00039 2) unite terms with the same frequencies
00040 3) rearrange the terms so that calculation of the argument becomes easier
00041 4) substitute so that the independent variable becomes T=jd-2444240
00042    for all satellites (including hyperion)
00043 5) do not calculate a satellites "rmu" at runtime but beforehand
00044 6) use a rotation matrix for Transformation to J2000
00045    instead of AIA, OMA and inclination of earth axis
00046 7) exchange indices of hyperion and iapetus
00047 8) calculate the orbital elements not for every new jd but rather reuse
00048    the previousely calculated elements if possible
00049 
00050 ****************************************************************/
00051 
00052 
00053 #ifndef _TASS17_H_
00054 #define _TASS17_H_
00055 
00056 #ifdef __cplusplus
00057 extern "C" {
00058 #endif
00059 
00060 #define TASS17_MIMAS     0
00061 #define TASS17_ENCELADUS 1
00062 #define TASS17_TETHYS    2
00063 #define TASS17_DIONE     3
00064 #define TASS17_RHEA      4
00065 #define TASS17_TITAN     5
00066 #define TASS17_HYPERION  7
00067 #define TASS17_IAPETUS   6
00068 
00069 void GetTass17Coor(double jd,int body,double *xyz);
00070 void GetTass17OsculatingCoor(double jd0,double jd,int body,double *xyz);
00071 
00072 #ifdef __cplusplus
00073 }
00074 #endif
00075 
00076 #endif

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