Astrophysics (comet orbit question)

[Radfire]

Homework Statement

A comet from the Oort cloud, with perihelion 6AU, is perturbed by Saturn into an
orbit with perihelion 4AU. What is the semi-major axis and eccentricity of the new
orbit?

Homework Equations

Perihelion = a(1-e)

The Attempt at a Solution

hey i could really use some help here, I am been scratching my head for ages now. I know that if I can get either the semi-major axis or the eccentricity then i have the other. Could anybody push me in the right direction please...thanks in advance

 

[Radfire]

I figured it out...Moderator can close thread