Actions

::Orbital eccentricity

::concepts

Orbit::orbital    Title::years    Solar::between    Values::value    System::planet    Kepler::ellipse

{{#invoke:Hatnote|hatnote}}

An elliptic, parabolic and hyperbolic Kepler orbit:
      elliptic (eccentricity = 0.7)
      parabolic (eccentricity = 1)
      hyperbolic orbit (eccentricity = 1.3)

The orbital eccentricity of an astronomical object is a parameter that determines the amount by which its orbit around another body deviates from a perfect circle. A value of 0 is a circular orbit, values between 0 and 1 form an elliptical orbit, 1 is a parabolic escape orbit, and greater than 1 is a hyperbola. The term derives its name from the parameters of conic sections, as every Kepler orbit is a conic section. It is normally used for the isolated two-body problem, but extensions exist for objects following a rosette orbit through the galaxy.


Orbital eccentricity sections
Intro  Definition  Etymology  Calculation  Examples  Mean eccentricity  Climatic effect  See also  References  External links  

PREVIOUS: IntroNEXT: Definition
<<>>