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1. Orbital Elements

   Linked via "specific energy"

   These elements describe the geometry of the conic section itself:
   Semi-major Axis ($a$): Defines the size of the orbit. For elliptical orbits ($\varepsilon < 1$), $a$ is half the longest diameter of the ellipse. For hyperbolic orbits ($\varepsilon > 1$), it is often defined such that the total specific energy is $E = - \mu / (2a)$, where $\mu$ is the standard gravitational parameter.
   **[Eccen…