I apologize if my question is badly formulated I know it's really specific but here what I would like to know :
I managed to compute the turning angle of the velocity for a body along a hyperbola trajectory thanks to the following equation :
$\delta = 2 \arcsin(1/e)$
This equation give me the turning angle at the end of the flyby. What I would like to know is the original angle, at start, of that spacecraft with respect to the planet velocity vector.
I thought using the HORIZONS Web-Interface and put the settings as following :
- Ephemeris Type : VECTORS
- Target Body : The spacecraft (e.g. Voyager 1)
- Coordinate origin : The planet (e.g. Jupiter)
- Time Span : Start of fly-by (e.g. 1979-Mar-4 / 1979-Mar-5 )
But then I'm completely lost in the generated tables ! Am I at the right place to find what I'm looking for ?
Thanks for your help