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How much energy do i need when i move an object with a mass M from a circular orbit with a radius of R_1 to an ellipse orbit with aphelion radius of R_2.

I'm assuming energy principle is the way to go here but it leads to a question i'd like someone to help me out with.

Do i need to assume the perihelion radius of the new orbit (aphelion radius R_2) is the circular orbit's radius R_1?

Thanks in advance.