abstract:In celestial mechanics, the eccentricity vector of a Kepler orbit is the vector that points towards the periapsis and has a magnitude equal to the orbit's scalar eccentricity. The magnitude is unitless.
The satellites follow a combinedeccentricityandinclination vectorseparationstrategy, so that thegroupgeometrycan beexpressedsimplyby the orbitalelementsofeachmember.