Fortran-Astrodynamics-Toolkit-master.zip

 ============ [](https://github.com/jacobwilliams/Fortran-Astrodynamics-Toolkit/releases/latest) [](https://github.com/jacobwilliams/Fortran-Astrodynamics-Toolkit/actions) [](https://codecov.io/gh/jacobwilliams/Fortran-Astrodynamics-Toolkit) [](https://zenodo.org/badge/latestdoi/21782788)  ## Overview The goal of the Fortran Astrodynamics Toolkit is to produce a comprehensive library, written in modern Fortran (Fortran 2008+), of all the standard orbital mechanics algorithms. This is a work in progress. Currently-implemented and proposed capabilities include: * Lambert solvers - [x] Gooding - [x] Izzo - [x] Arora * Kepler propagators - [x] Gooding - [x] Shepperd - [x] Goodyear * ODE solvers (with event-finding) - [x] Runge-Kutta - [ ] Nystrom - [ ] Adams * Force models - [ ] point mass gravity field - [x] geopotential gravity - [ ] solar radiation pressure - [ ] atmospheric drag - [ ] relativistic effects * Reference frames - [x] IAU_EARTH - [x] IAU_MOON * Celestial Body Ephemerides - [x] JPLEPH - [x] SPICE - [x] Analytical Moon w.r.t Earth - [x] Analytical solar system primary bodies * Alternate equations of motion - [x] Circular restricted three-body problem - [x] Clohessy-Wiltshire - [x] Modified equinoctial elements * Misc - [x] orbital element conversions - [x] halo orbits - [ ] targeting and optimization - [ ] spacecraft engine models ## Examples <a href="https://github.com/jacobwilliams/Fortran-Astrodynamics-Toolkit/tree/master/tests/crtbp"><img src="https://github.com/jacobwilliams/Fortran-Astrodynamics-Toolkit/blob/master/tests/crtbp/crtbp_test.png" align="center" height="300"></a> <a href="https://github.com/jacobwilliams/Fortran-Astrodynamics-Toolkit/tree/master/tests/gravity"><img src="https://github.com/jacobwilliams/Fortran-Astrodynamics-Toolkit/blob/master/tests/gravity/trajectory.png" align="center" height="400"></a> <a href="https://github.com/jacobwilliams/Fortran-Astrodynamics-Toolkit/tree/master/tests/dro"><img src="https://github.com/jacobwilliams/Fortran-Astrodynamics-Toolkit/blob/master/tests/dro/dros.png" align="center" height="400"></a> ## Building The Fortran Astrodynamics Toolkit and the test programs will build with any modern Fortran compiler. A [Fortran Package Manager](https://github.com/fortran-lang/fpm) manifest file (`fpm.toml`) is included, so that the library and tests cases can be compiled with FPM. For example: ``` fpm build --profile release fpm test --profile release ``` To use `Fortran-Astrodynamics-Toolkit` within your fpm project, add the following to your `fpm.toml` file: ```toml [dependencies] fortran-astrodynamics-toolkit = { git="https://github.com/jacobwilliams/Fortran-Astrodynamics-Toolkit.git" } ``` or, to use a specific version: ```toml [dependencies] fortran-astrodynamics-toolkit = { git="https://github.com/jacobwilliams/Fortran-Astrodynamics-Toolkit.git", tag = "0.3" } ``` To generate the documentation using [ford](https://github.com/Fortran-FOSS-Programmers/ford), run: `ford ford.md` ## Third-Party Requirements A script `get_third_party.sh` is included to download and build the third-party dependencies on unix-like operating systems. ### Pyplot-Fortran The plots generated by the examples are done using the [pyplot-fortran](https://github.com/jacobwilliams/pyplot-fortran) module. When compiling with FPM, this will automatically be downloaded and compiled. ### Ephemeris files To use the ephemeris_module, a copy of one of the JPL binary ephemeris files must be present in the ```eph``` directory. This can be built from the instructions at: ftp://ssd.jpl.nasa.gov/pub/eph/planets/fortran/userguide.txt. For example (on Linux): ```bash wget ftp://ssd.jpl.nasa.gov/pub/eph/planets/fortran/* wget ftp://ssd.jpl.nasa.gov/pub/eph/planets/ascii/de405/* #edit asc2eph.f file to set NRECL = 4: sed -i '_original' '/^C.*PARAMETER ( NRECL = 4 )/s/^C//' asc2eph.f gfortran asc2eph.f -o asc2eph cat header.405 ascp*.405 | ./asc2eph mkdir Fortran-Astrodynamics-Toolkit/eph mv JPLEPH Fortran-Astrodynamics-Toolkit/eph/JPLEPH.405 ``` ### Geopotential files To use the geopotential_module, you need a geopotential model file (for example ```GGM03C.GEO``` from ftp://ftp.csr.utexas.edu/pub/grace/GGM03/GGM03_Archive.zip). This should be placed in the ```grav``` directory. For example: ```bash wget http://download.csr.utexas.edu/pub/grace/GGM03/GGM03_Archive.zip unzip GGM03_Archive.zip mkdir Fortran-Astrodynamics-Toolkit/grav cp GGM03_Archive/GGM03C.GEO Fortran-Astrodynamics-Toolkit/grav ``` ## Documentation The documentation for the latest code in `master` can be found [here](http://jacobwilliams.github.io/Fortran-Astrodynamics-Toolkit/). ## See also * [SPICE](http://naif.jpl.nasa.gov/naif/toolkit.html) * [NOVAS](http://aa.usno.navy.mil/software/novas/novas_info.php) * [SOFA](http://www.iausofa.org) * [astro-fortran](https://github.com/jacobwilliams/astro-fortran) * [LLEA](https://github.com/helgee/LLEA) * [poliastro](https://github.com/poliastro/poliastro)