Astronomy Question help please?

Manda Manda

New member
I'm not really looking to have it all solved for me... if someone could just point me in the correct direction or give me a formula, it would be greatly appreciated. :P

An asteroid has a perihelion distance of 0.21 A.U. and an orbital eccentricity of 0.66. What is its semi-major axis and aphelion distance from the Sun? [In AU]

Thanks so much.
 
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