The term "orbital extreme" is not a standard astronomical term. There are many different aspects of orbits and their characteristics. To help you understand what you might be referring to, could you please clarify what you mean by "orbital extreme"?

For example, are you asking about:

* Periapsis and Apoapsis: These are the points in an elliptical orbit where the object is closest to and furthest from the central body, respectively.

* Orbital Eccentricity: This describes how elongated an orbit is. An orbit with high eccentricity is very elongated, while an orbit with low eccentricity is almost circular.

* Orbital Inclination: This describes the angle between the orbital plane and a reference plane, such as the equator of a planet. A highly inclined orbit would be tilted at a steep angle compared to the reference plane.

* Orbital Period: This is the time it takes an object to complete one full orbit around a central body.

Please provide more context or information so I can accurately answer your question.