Enter the orbital period (years) and the eccentricity into the Calculator. The calculator will evaluate the Aphelion Distance.

## Aphelion Distance Formula

AD = SQRT(T) * (1+e)

Variables:

- AD is the Aphelion Distance (AU)
- T is the orbital period (years)
- e is the eccentricity

To calculate the Aphelion Distance, add one to the eccentricity, then multiply by the square root of the orbital period.

## How to Calculate Aphelion Distance?

The following steps outline how to calculate the Aphelion Distance.

- First, determine the orbital period (years).
- Next, determine the eccentricity.
- Next, gather the formula from above = AD = SQRT(T) * (1+e).
- Finally, calculate the Aphelion Distance.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem : **

Use the following variables as an example problem to test your knowledge.

orbital period (years) = 80

eccentricity = 12