Question

A star with the same mass of the sun has a newly discovered planet whose semi-major axis of 2.48 au and an eccentricity of 0.08. what is the aphelion distance of the new planet

Answer 1

aphelion means farthest distance:

r_a = a*(1+e), a = 2.48, e = 0.08

perihelion is a*(1-e).

Also, other people would say apastron and periastron, changing helio=Sun for another star.