Example

Example: Finding the Equation of an Elliptical Orbit Given Distances of 2020 AU and 5050 AU

Consider a planet moving in an elliptical orbit around its sun. The closest the planet gets to the sun is approximately 2020 AU and the furthest is approximately 5050 AU. Centering the ellipse at the origin as depicted in the corresponding graph reveals vertices at (35,0)(-35, 0) and (35,0)(35, 0), meaning a=35a = 35 and a2=1225a^2 = 1225. The sun is positioned at a focus at the point (15,0)(15, 0), which gives c=15c = 15. The value of b2b^2 is found using the formula b2=a2c2b^2 = a^2 - c^2. Substituting the known values results in b2=352152=1225225=1000b^2 = 35^2 - 15^2 = 1225 - 225 = 1000. Finally, substituting a2a^2 and b2b^2 into the standard form equation for an ellipse centered at the origin provides the equation: x21225+y21000=1\frac{x^2}{1225} + \frac{y^2}{1000} = 1.

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Updated 2026-05-25

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