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  • Orbital eccentricity - Wikipedia
    In astrodynamics, the orbital eccentricity of an astronomical object is a dimensionless 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 elliptic orbit, 1 is a parabolic (escape orbit or capture orbit), and greater than 1 is a hyperbola The term derives its name from the
  • Eccentricity vector - Wikipedia
    Eccentricity vector In celestial mechanics, the eccentricity vector of a Kepler orbit is the dimensionless vector with direction pointing from apoapsis to periapsis and with magnitude equal to the orbit's scalar eccentricity For Kepler orbits the eccentricity vector is a constant of motion
  • Glossary of astronomy - Wikipedia
    This glossary of astronomy is a list of definitions of terms and concepts relevant to astronomy and cosmology, their sub-disciplines, and related fields Astronomy is concerned with the study of celestial objects and phenomena that originate outside the atmosphere of Earth
  • Keplers equation - Wikipedia
    where is the mean anomaly, is the eccentric anomaly, and is the eccentricity The 'eccentric anomaly' is useful to compute the position of a point moving in a Keplerian orbit As for instance, if the body passes the periastron at coordinates , , at time , then to find out the position of the body at any time, you first calculate the mean anomaly from the time and the mean motion by the formula
  • Elliptic orbit - Wikipedia
    In astrodynamics or celestial mechanics, an elliptical orbit or eccentric orbit is an orbit with an eccentricity of less than 1; [citation needed] this includes the special case of a circular orbit, with eccentricity equal to 0 Some orbits have been referred to as "elongated orbits" if the eccentricity is "high" but that is not an explanatory term For the simple two body problem, all orbits
  • Eccentric anomaly - Wikipedia
    In orbital mechanics, the eccentric anomaly is an angular parameter that defines the position of a body that is moving along an elliptic Kepler orbit, the angle measured at the center of the ellipse between the orbit's periapsis and the current position The eccentric anomaly is one of three angular parameters ("anomalies") that can be used to define a position along an orbit, the other two
  • Exoplanet orbital and physical parameters - Wikipedia
    Most known extrasolar planet candidates have been discovered using indirect methods and therefore only some of their physical and orbital parameters can be determined For example, out of the six independent parameters that define an orbit, the radial-velocity method can determine four: semi-major axis, eccentricity, longitude of periastron, and time of periastron Two parameters remain





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