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Apoapsis


ApoapsisPeriapsis

The greatest radial distance of an ellipse as measured from a focus. Taking v=pi in the equation of an ellipse

 r=(a(1-e^2))/(1+ecosv)

gives the apoapsis distance

 r_+=a(1+e).

Apoapsis for an orbit around the Earth is called apogee, and apoapsis for an orbit around the Sun is called aphelion.


See also

Eccentricity, Ellipse, Focus, Periapsis

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Cite this as:

Weisstein, Eric W. "Apoapsis." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Apoapsis.html

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