# Apsis-Apocenter (maximum distance)

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r_(ap) =
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The Apsis-Apocenter Maximum Distance calculator computes the maximum distance from the center of gravity in an orbit at apogee based on the semi-major axis (a) and eccentricity (e).

INSTRUCTION: Choose units and enter the following:

• (a) This is the semi-major axis of the orbit
• (e) This is the eccentricity of the the orbit

Maximum Distance (rap): The calculator returns the distance in meters.  However this can be automatically converted to compatible units via the pull-down menu.
The apsides indicate the nearest
and furthest points of an
orbiting body around its host.
(1) farthest - apocenter
(2) nearest - pericenter
(3) focus - primary

#### The Math / Science

The Apsis-Apocenter is an extreme point in an object's orbit. For elliptical orbits about a larger body, there are two apsides. This is commonly known as the apogee. The apocenter is the point furthest away from the object being orbited.

r_(ap)=(1+e)a

where:

## References

Wikipedia (https://en.wikipedia.org/wiki/Apsis)