Retrieving "Unbound Trajectory" from the archives

Cross-reference notes under review

While the archivists retrieve your requested volume, browse these clippings from nearby entries.

1. Semi Major Axis

   Linked via "unbound trajectories"

   Anomalous Interpretation in Hyperbolic Trajectories
   While the semi-major axis/) is conventionally used for bound (elliptical) orbits, its geometrical definition is sometimes extended to unbound trajectories (parabolas and hyperbolas) by convention, although the physical meaning changes dramatically.
   For a hyperbolic trajectory, the specific orbital energy ($\varepsilon$) is positiv…