# astronomy

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if a comet is 125 years from sun and has a perihelion distance of 1. AU..What is the aphelion distance?
I formulated it this way, is this right?

125years^2/1.AU^3= 15,625

• astronomy -

• astronomy -

I explained this yesterday. The distance that gets used in the Kepler equation is the semimajor axis, a, NOT the perihelion distance. Therefore
125^2/a^3 = 1
a^3 = 125^2 = 15625
a = cube root of 15625 = 25 AU

(Aphelion + Perihelion)/2 = a
(Aphelion + Perihelion) = 50
Aphelion = 50 - 1 = 49 AU

• astronomy -

yes this is explained much better thank you for your time

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