Definition:Orbit (Physics)/Radius

Definition

Let body $A$ be in orbit around body $B$.

Let $\mathbf r$ be the position vector of the center of mass of $A$ with respect to the center of mass of $B$ at a particular point in time.

The radius of the orbit of $A$ around $B$ is defined as:

the position vector $\mathbf r$

or

the length of $\mathbf r$.

Context will determine which is meant.

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