Concept information
Preferred term
Eccentricity
Definition
- The amount by which the orbit deviates from circularity: e = c/a, where c is the distance from the center to a focus and a the semi-major axis. If e = 0, the orbit is a circle. If e < 1, the orbit is an ellipse, if e > 1 it is a hyperbola, and if e = 1 it is a parabola. The eccentricity is one of the six orbital elements that define a Keplerian orbit. (en)
Broader concept
- Orbital elements (en)
Editorial note
URI
http://astrothesaurus.org/uat/441
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