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Orbital '''eccentricity''' is the measure of the shape of a Kepler orbit, .
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http://en.wikipedia.org/wiki/Orbital_eccentricity
 
 
Every orbit is a Kepler orbit in a two-body problem, taking the shape of a conic section.
 
Eccentricity of an orbit may be any non-negative value and is a dimensionless quantity, indicated by the variable e.
 
 
 
The eccentricity may take values as follows:
 
*Circular orbit e = 0
 
*Elliptical orbit 0 < e < 1
 
*Parabolic trajectory e = 1
 
*Hyperbolic trajectory e > 1
 
 
 
 
 
== See also ==
 
[[w:Orbital eccentricity|Orbital eccentricity]] at Wikipedia.
 
 
 
{{Stub}}
 
[[Category: Articles]]
 
[[Category:Celestial mechanics]]
 

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