Orbital Eccentricity

A measure of the shape of a celestial body's orbit, expressed as a unitless number.

Description (Specifications)

The orbital eccentricity of a planet is expressed as a number notated as e, standing for eccentricity.

• A value of e=0 is a perfectly circular orbit.
• A value of e=1 a parabolic orbit.
• If e has a value of greater than one it represents a hyperbolic trajectory.

Worlds

Diagram of a world with an eccentric orbit around a star:

Stars

Diagrams of stars with eccentric orbits around a barycenter, a common center of mass:

History & Background (Dossier)

A perfectly circular orbit is indicated by an eccentricity of zero. Increasingly elliptical orbits have values between zero (0) and one (1). Parabolic orbits are indicated by a value of one, while values above 1 represent hyperbolic orbits, typically associated with celestial objects that are not bound to a star.

See the references below for further definition and application.

See also

Star systems

§ == ( Please refer to the following AAB Library Data for more information: ) == §

• Star System
• Astrography

• Planetology
  • Axial Tilt
  • Inner World
  • Habitable Zone
  • Lagrange Point
  • Outer World
  • Orbital Eccentricity
  • Remote System
  • Far System

Contents

• Star
• Gas Giant
• Planet
• Main World
• Natural Satellite
• Planetoid
• Planetary Ring
• Satellite

Environment

• Asteroid Belt World
• Ellipsoid World
• Fluid World
• Garden World
• Gas Giant
• Hell World
• Ice World
• Locked World
• Ocean World
• Planetoid Belt World
• Rad World
• Satellite World
• Storm World
• Terran Prime World (Gaian or Garden) world
• Terrestrial World
• Twilight Zone World
• Vacuum World
• Water World

References & Contributors (Sources)

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This list of sources was used by the Traveller Wiki Editorial Team and individual contributors to compose this article. Copyrighted material is used under license from Mongoose Publishing or by permission of the author. The page history lists all of the contributions.

• Marc Miller. Scouts (Game Designers Workshop, 1983), 50.
• Wikipedia article: Orbital Eccentricity