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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
  • 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
  • Eccentricity - Wikipedia
    Orbital eccentricity, in astrodynamics, a measure of the non-circularity of an orbit Eccentric anomaly, the angle between the direction of periapsis and the current position of an object on its orbit Eccentricity vector, in celestial mechanics, a dimensionless vector with direction pointing from apoapsis to periapsis Eccentric, a type of deferent, a circle or sphere used in obsolete
  • 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
    The eccentric anomaly of point P is the angle E The center of the ellipse is point O, and the focus is point F Consider the ellipse with equation given by: x 2 a 2 + y 2 b 2 = 1 , {\displaystyle {\frac {x^ {2}} {a^ {2}}}+ {\frac {y^ {2}} {b^ {2}}}=1,} where a is the semi-major axis and b is the semi-minor axis For a point on the ellipse, , representing the position of an orbiting body in an
  • 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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