Mercury Perihelion

[LoopQG]

1. The problem statement, all variables and given/known data

I need to calculate S in order to calculate the perihelion shift of Mercury. I have found the Euler Lagrange equation to be:

G^{\nu\beta}(\partial_{\beta}S)(\partial_{\nu}S)-m^{2}=0

Which is a form of the Hamilton-Jacobi equation.

Which my professor tells me is correct. I am just not sure on how to start calculating S. I have been given G^{00},G^{11},G^{22},G^{33} Do I just plug those in to solve for S? I think I am just confused on how to start I think. Any help appreciated.
1. The problem statement, all variables and given/known data



2. Relevant equations



3. The attempt at a solution

[Chris A]

I am working out a problem on orbital motion: Thus finding the minimum kinetic energy required for a comet to change the new orbit to a parabola after colliding with another planet of a bigger mass.

My idea is first setting the condition for a parabolic orbit: thus e=1
and using the equation E+Gm/r(1-ro/2r)=0
I am expand these equation further by making a few substitutions can i get help in continuing this? Thanks