Eccentricity
Related Category: Astronomy: General
in astronomy: see orbit.
More on Eccentricity ...
Orbital Eccentricity
PlanetOrbital EccentricityPerihelion
(Point in Orbit Closest to Sun)
measured in AU'sAphelion
(Point in Orbit Farthest from Sun)
measured in AU's
Mercury ...
Eccentricity = e = c/a
Orbital Eccentricity
PlanetOrbital EccentricityPerihelion
(Point in Orbit Closest to Sun)
measured in AU'sAphelion
(Point in Orbit Farthest from Sun)
measured in AU's ...
Definition: eccentricity: The eccentricity of an ellipse (planetary orbit) is the ratio of the distance between the foci and the major axis.In other words, the more flattened the circle (ellipse), the more 'eccentric' the orbit.
Orbital Eccentricity
The orbital eccentricity (or eccentricity) is a measure of how much an elliptical orbit is 'squashed'.
Eccentricity
(a) In astronomy, the extent to which an elliptical orbit departs from a circular one. It is usually expressed as a decimal fraction, regarding a circle as having an eccentricity of 0.
Eccentricity
An orbital parameter describing the eccentricity of the orbit ellipse. Eccentricity e is the ratio of half the distance between the foci c to the semi-major axis a: e=c/a.
ECCENTRICITY - Ratio of the distance between the foci and the major axis of an ellipse (planetary orbit). Eccentricity is:
where ra = apoapsis distance and rp = periapsis distance.
eccentricity (of the Earth's orbit): [ec, EC] a measure of the relative sizes of the major and minor axes of the Earth's elliptical orbit. ec = 0.01671. in the year 2000 and is slowly decreasing. ec = 0 would imply a circular orbit.
eccentricity A measure of the flatness of an ellipse, equal to the distance between the two foci divided by the length of the major axis.
eccentricity
the extent to which a body's elliptical orbit deviates from a circle
eclipse ...
Eccentricity A measure of how 'long or thin' an ellipse is. If the eccentricity equals zero, you have a circle.
Eclipse When one object passes into the shadow of another.
eccentricity (e):
Measure of the ellipticity of the orbit. A circular orbit has e=0 while a segment has e=1.
ecliptic:
The curve defined by the apparent motion of the Sun in the sky.
eccentricity
A value that defines the shape of an ellipse or planetary orbit. The eccentricity of an ellipse (planetary orbit) is the ratio of the distance between the foci and the major axis.
Eccentricity -- The distance between the foci of an ellipse divided by the major axis.
Ecliptic -- The plane in which Earth orbits the sun and in which solar and lunar eclipses occur.
EDL -- (Atmospheric) Entry, Descent, and Landing.
Eccentricity: The measure of the degree of elongation of an ellipse. For example, a circle has an eccentricy of 0, and a parabola (an open figure) an eccentricity of 1. The deviation of an orbit from a perfect circle.
eccentricity
A value between zero and one which represents the shape of an ellipse or an orbit. A low eccentricity is near zero and is a perfect circle, while a high eccentricity is near one and very oval.
...
Eccentricity. The measure of how non-circular an object's orbit is. 0 = a perfect circle; any figure between 0 and 1 = an ellipse; 1 = a parabola; any figure greater than 1 = a hyperbola.
eccentricity (e): A measure of the flattening of an ellipse. An ellipse of e = 0 is circular. The closer to 1 e becomes, the more flattened the ellipse.
Eccentricity - A measure of the extent to which an orbit departs from circularity. Eccentricity ranges from 0.0 for a circle to 1.0 for a parabola ...
Eccentricity of Orbit
The habitable zone around a star was first developed for roughly circular planetary orbits, where the eccentricity of the orbit is close to zero (e~ 0).
Eccentricity -- Number between 0 and 1, gauging the elongation of elliptic orbit. The eccentricity e of the orbital ellipse is one of the "orbital elements" characterizing it.
Eccentric anomaly See anomaly.
eccentricity measures how far from a circular shape an ellipse is. Numerically, the eccentricity e = 1 -- (perihelion / semi-major axis). The eccentricity e = 0 for a circle and e = nearly one (1) for very long, skinny ellipses.
Eccentricity- a measure of how closely a planet's orbit approximates to a perfect circle
Eclipse- when one celestial body passes in front of another, dimming or obscuring its light (e.g. solar, lunar, and eclipsing binaries) ...
Eccentricity is a measure of how an orbit deviates from circular. A perfectly circular orbit has an eccentricity of zero; an eccentricit between0 and 1 represents an elliptical orbit.
Eccentricity is a mathematical measure of departure from circularity. A circle has zero eccentricity, and most of the planets have orbits which are nearly circles. Only Pluto and Mercury have eccentricities exceeding 0.1.
Eccentricity, which together are the basic measurements of the size and shape of the orbit's ellipse (described in Chapter 3. Recall an eccentricity of zero indicates a circular orbit).
Eccentricity
The Earth's orbit around the Sun is not a perfect circle, but slightly "stretched" into an ellipse (Figure 4). Its eccentricity is currently about 0.0167, which means that the Earth-Sun distance varies about 1.67% of the mean distance.
Eccentricity
The measure of how an object's orbit differs from a perfect circle. Eccentricity defines the shape of an object's orbit.
Eclipse
The total or partial blocking of one celestial body by another.
The eccentricity of the orbits is represented by red segments (extending from perihelion to aphelion) and the inclination represented on Y axis.
The eccentricity of Saturn's orbit around the Sun could be responsible for the unusually uneven distribution of lakes over the polar regions of Saturn's largest moon Titan.
The eccentricity and inclination of the scattered disc population compared to the classical and 5:2 resonant Kuiper belt objects ...
The eccentricity of an orbit is a measure of how elliptical (elongated) it is. Most known exoplanets have quite eccentric orbits.
The eccentricity determined in this way is more than a degree in error, owing to the effect of the evection, which was unknown to Hipparchus.
Orbit eccentricity (deviation from circular)
0.017
Mean surface temperature (K) ...
was an Eccentricity , iconoclastic Japanese Zen Buddhism priest and poet. He had a great impact on the infusion of Japanese art and literature with Zen attitudes and ideals.....
, Izumi Shikibu
Izumi Shikibu ...
Mars's orbital eccentricity is 0.093, much larger than that of most other planets"only the innermost and the outermost planets, Mercury and Pluto, have more elongated orbits. Because of this, Mars's perihelion distance from the Sun"1.38 A.U.
eccentricity the eccentricity of an ellipse (planetary orbit) is the ratio of the distance between the foci and the major axis. Equivalently the eccentricity is (ra-rp)/(ra+rp) where ra is the apoapsis distance and rp is the periapsis distance.
A circle has an eccentricity of 0.0, a parabola 1.0.
3
The inclination of a planetary orbit is measured with respect to the plane of the earth's orbit.
The effect of this eccentricity is that the seasons are very uneven in length.
Orbit:
Inclination
Eccentricity (deviation from circular)
Obliquity (axis tilt) ...
The eccentricity would be the value of the foci-foci distance (green line) divided by the widest part of the ellipse (blue line). For the circle, the green line has a value of 0, so the eccentricity for a circle is 0.
parabolic orbit An orbit shaped like a parabola; the orbit representing the least eccentricity (that of 1) for escape from an attracting body.
eccentricity a parameter that describes the shape of an orbit; the closer the eccentricity is to zero, the more circular the orbit ecliptic the path the Sun takes against the background stars; ...
"a" is the size of the orbit in thousandths of a second of arc (the scale of the axes), "e" is the eccentricity of the true (unprojected) ellipse, and "i" is the orbital tilt. (Thanks to A. F. Boden, G. Torres, and C. A.
Eccentricity of an orbit is a measure of how far from a circle the elliptical shape appears. For a circular orbit the eccentricity, (e), is zero, for a parabolic orbit e="'1," while' a hyperbolic orbit has e greater than 1.
Since the much larger body Titan always exerts a maximum gravitational perturbation at the same points on Hyperion's orbit, Hyperion is forced into a relatively large eccentricity.
5 AU and an orbital eccentricity between about 0.4 and 0.65. These objects are held in this region by the 1:3 orbital resonance with Jupiter, which results in a 4:1 resonance with Earth.
It is usually expressed as a decimal fraction, regarding a circle as having an eccentricity of 0. [A84]
(b) A measure of how round or elliptical an orbit is.
Five parameters determine an orbit: a semimajor axis and e eccentricity in addition to (,i,).
The amount of "flattening" of the ellipse is termed the eccentricity. Thus, in the following figure the ellipses become more eccentric from left to right.
Within the main belt are groups of asteroids that cluster with respect to certain mean orbital elements (semimajor axis, eccentricity, and inclination). Such groups are called families and are named for the lowest numbered asteroid in the family.
The ratio of distances, called the eccentricity, is the discriminant (q.v.; of a general equation that represents all the conic sections [see conic section]).
017 AU Eccentricity
0.01671022 Orbital period
365.25636 days Avg. Orbital Speed
29.7859 km/s Inclination
0.00005° Satellites
1 (the Moon) Satellite of
Sun Physical characteristics Equatorial diameter
12,756.3 km Surface area
5.10072×108 km2 Mass
5.
The solar tide would tend to circularize Io's orbit, but its eccentricity is forced by a 2:1 resonance with . The plume Pele is 1000 km across.
They are the semi-major axis (a), the eccentricity (e), the inclination to the reference plane (i), the mean anomaly (M), the argument of the pericentre (w), and the longitude of the ascending node (W).
As a result of orbital eccentricity, the temperature as measured at perihelion is two and a half times the heat received at aphelion.
The orbit of Mercury has the highest eccentricity of all the Solar System planets, and it has the smallest axial tilt. It completes three rotations about its axis for every two orbits.
Analysis of the light curve may allow astronomers to determine the eccentricity, orientation and inclination of the orbit.
The ratio of these two lengths determines the eccentricity (e) of the ellipse; it's a measure of how elliptical it is. Circles have e=0, and very stretched-out ellipses have an eccentricity nearly equal to 1.
 See also: Eccentric, Orbit, Planet, Period, Solar
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