# Solar System Orbital Parameters [duplicate]

I recently made an n-body simulation and thought it would be interesting to try and model it on the interior of our solar system (Sun to Mars), but I cannot find initial conditions for such an undertaking. My biggest problem seems to be that I'm not working with a spherical coordinate system and instead have opted to using the 3D Cartesian system. Does anyone know of any data that gives initial positions and velocities of the Solar System's planets and their moons in 3D Cartesian coordinates, so I can plug this into a system of differential equations as initial conditions?

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## marked as duplicate by Sjoerd C. de Vries, whuber, m_goldberg, Michael E2, ArtesMay 21 '13 at 6:17

FWIW, AstronomicalData[] has a nice bounty of information, including orbit paths and eccentricities. See e.g. this question. On the other hand, there's a certain appeal in using numerical integration instead of merely taking coordinates from an ephemeris... – J. M. May 20 '13 at 19:25
You were asking for positions and velocities. These can be found using AstronomicalData as demonstrated in that question. – Sjoerd C. de Vries May 20 '13 at 21:44