Search results
Results from the WOW.Com Content Network
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 ...
e is the eccentricity vector (a vector pointing towards the periapsis). In the case of equatorial orbits (which have no ascending node), the argument is strictly undefined. However, if the convention of setting the longitude of the ascending node Ω to 0 is followed, then the value of ω follows from the two-dimensional case: ω = a t a n 2 ( e ...
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 eccentric anomaly is one of three angular parameters ("anomalies") that define a position along an orbit, the other two being the true anomaly and the mean anomaly.
orbital eccentricity A parameter that determines how much an orbit deviates from a perfect circle. For an elliptical orbit, the eccentricity ranges from greater than zero to less than one. orbital elements The set of parameters that uniquely define an orbit. A diagram showing four of the six canonical orbital elements.
Note that the truncated equation fails at high eccentricity and produces an oscillating curve. But this is because the coefficients of the Fourier series are inaccurate due to truncation in their calculation. In Keplerian motion, the coordinates of the body retrace the same values with each orbit, which is the definition of a periodic function.
Orbital diagram of a quasi-satellite. A quasi-satellite, such as the one shown in this diagram, moves in a prograde orbit around the Sun, with the same orbital period (which is also called a year) as the planet it accompanies, but with a different (usually greater) orbital eccentricity. It appears, when seen from the planet, to revolve around ...
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
As eccentricity increases further the motion approaches a straight line. The angle between the direction of periapsis and an asymptote from the central body is the true anomaly as distance tends to infinity ( θ ∞ {\displaystyle \theta _{\infty }\,} ), so 2 θ ∞ {\displaystyle 2\theta _{\infty }\,} is the external angle between approach and ...