About initial conditions

  1. Hi guys, help me.

    I have a code for integrate the equations of motion of three bodies in a inertial frame, and in cartesian coordinates (x, y, z, vxi, vyi, vzi), i=1,2,3.
    The question is, how can i use the data of JPL Horizons to obtain positions and velocities in a inertial frame? :surprised
     
  2. jcsd
  3. tony873004

    tony873004 1,584
    Science Advisor
    Gold Member

    Here's a short tutorial I wrote for my program, Gravity Simulator
    http://orbitsimulator.com/gravity/tutorials/tutorials.html#horizons

    But you can use the data for your own program as well.
    This describes the e-mail method. In addition, Horizons also offers Telnet and Web based services.
     
  4. Thank you tony. I will read this tutorial.
     
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