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The 49 pages that link to Orbital eccentricity, each with the reason it gives.

• CometRelated: Many comets follow highly elongated orbits that carry them between distant reservoirs and the inner Solar System.

• Orbital periodRelated: It changes the body's speed around an orbit, though not the period at fixed semimajor axis and mass.

• Tidal heatingRelated: An eccentric orbit makes the tide-raising force vary during each revolution.

• Vis-viva equationRelated: Together with semimajor axis, it helps determine radius and speed around an ellipse.

• Hill sphereRelated: An eccentric orbit makes the Hill sphere's effective extent vary along the orbit.

• Mercury's perihelion precessionRelated: Mercury’s noticeably eccentric orbit makes its perihelion direction well-defined.

• Orbital decayRelated: Decay can change eccentricity as well as orbital size, so altitude alone may not describe the evolution.

• Oort cloudRelated: Long-period comets' highly elongated orbits point back to a distant source.

• Hohmann transfer orbitRelated: The transfer ellipse's eccentricity depends on the two circular-orbit radii.

• Near-Earth objectRelated: Eccentricity helps determine whether an object’s orbit approaches or crosses Earth’s path.

• Semimajor axisRelated: For an ellipse, eccentricity relates the semimajor and semiminor axes.

• PeriapsisRelated: Eccentricity helps determine the distance between periapsis and apoapsis.

• PerihelionRelated: Eccentricity determines how far perihelion lies from an orbit’s average distance.

• Jupiter-family cometRelated: Comet eccentricity determines how far its path stretches between the Sun and outer Solar System.

• Kirkwood gapRelated: Resonant perturbations can raise asteroid eccentricities until their paths become unstable.

• Oblate spheroidRelated: It quantifies the flattening of the generating ellipse.

• Circular orbitRelated: A circular orbit has eccentricity zero, making this quantity a direct shape test.

• Sidereal yearRelated: Earth’s noncircular orbit helps distinguish the sidereal year from the anomalistic year.

• Planet NineRelated: The unusual eccentricities of distant objects help constrain the proposed planet’s influence.

• Laplace resonanceRelated: Europa and Ganymede help keep Io’s orbit eccentric enough for strong tides.

• Long-period cometRelated: High eccentricity lets a comet travel from the distant Solar System to the Sun.

• Pulsar planetRelated: Timing variations can reveal whether a pulsar planet follows a circular or elongated orbit.

• Irregular satelliteRelated: High eccentricity is common among irregular satellites and distinguishes their paths from nearly circular regular-moon orbits.

• Earth analogRelated: A strongly eccentric orbit can produce large seasonal changes in received starlight.

• Kepler's equationRelated: It sets the size of the sine correction between the two anomalies.

• Satellite dragRelated: Eccentricity determines how atmospheric encounters and drag vary around an orbit.

• Scattered discRelated: High eccentricity gives many scattered-disc objects elongated paths that bring them relatively near Neptune.

• Kepler's second lawRelated: In an eccentric orbit, equal swept areas mean faster motion near the Sun and slower motion farther away.

• Molniya orbitRelated: High eccentricity concentrates much of the satellite’s orbital time near apogee.

• Kepler orbitRelated: It determines whether the orbit is circular, elliptical, parabolic, or hyperbolic.

• Geosynchronous orbitRelated: An eccentric geosynchronous orbit makes a satellite’s apparent position shift east and west.

• Schizotypal personality disorderRelated: Unusual conduct and presentation are visible parts of the disorder’s characteristic pattern.

• Hills cloudRelated: Highly eccentric orbits let distant comet bodies approach the planetary region.

• Moons of HaumeaRelated: Namaka’s eccentricity is central to models of the moons’ dynamical history.

• Frozen orbitRelated: A frozen orbit keeps this measure nearly constant over long timescales.

• Graveyard orbitRelated: Disposal planning limits eccentricity so the satellite does not intrude on protected orbital regions.