an elliptic orbit or elliptical orbit is a Kepler orbit with an eccentricity of less than 1; this includes the special case of a circular orbit, with...

highly elliptical orbit (HEO) is an elliptic orbit with high eccentricity, usually referring to one around Earth. Examples of inclined HEO orbits include...

Ek − Ep < 0: The orbit is bound, or closed. The motion will be on an ellipse with one focus at the other body. See radial elliptic trajectory, free-fall...

orbits can be either open or closed. Circular orbit: An orbit that has an eccentricity of 0 and whose path traces a circle. Elliptic orbit: An orbit with...

of the distance (such as gravity), has an orbit that is a conic section (i.e. circular orbit, elliptic orbit, parabolic trajectory, hyperbolic trajectory...

higher-impulse transfers. In some cases where one orbit is much larger than the other, a bi-elliptic transfer can use even less impulse, at the cost of...

orbit, e.g. the Powered Descent Initiation maneuver used for Apollo lunar landings. In orbital mechanics, the Hohmann transfer orbit is an elliptical...

For an elliptic orbit, the specific orbital energy equation, when combined with conservation of specific angular momentum at one of the orbit's apsides...

and aerospace engineering, the bi-elliptic transfer is an orbital maneuver that moves a spacecraft from one orbit to another and may, in certain situations...

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...

In orbital mechanics, a transfer orbit is an intermediate elliptical orbit that is used to move a spacecraft in an orbital maneuver from one circular...

on every pass. Circular orbit An orbit that has an eccentricity of 0 and whose path traces a circle. Elliptic orbit An orbit with an eccentricity greater...

altitude. The altitude of an object in an elliptic orbit can vary significantly along the orbit. Even for circular orbits, the altitude above ground can vary...

Tundra orbit (Russian: орбита «Тундра») is a highly elliptical geosynchronous orbit with a high inclination (approximately 63.4°), an orbital period of...

period and shape of the satellite's orbit will not change. A satellite in a low orbit (or a low part of an elliptical orbit) moves more quickly with respect...

trajectory is a Kepler orbit with the eccentricity equal to 1 and is an unbound orbit that is exactly on the border between elliptical and hyperbolic. When...

masses orbiting each other in a circular or elliptic orbit is: T = 2 π a 3 G M {\displaystyle T=2\pi {\sqrt {\frac {a^{3}}{GM}}}} where: a is the orbit's semi-major...

orbits of planets around the Sun. These laws replaced circular orbits and epicycles in the heliocentric theory of Nicolaus Copernicus with elliptical...

solstices, equinoxes, and apsides of Earth's elliptical orbit. The six Earth images are positions along the orbital ellipse, which are sequentially the perihelion...

acceleration to reach orbital speed. Higher energy orbits like geostationary orbit are often reached via elliptical transfer orbits. One type of orbit insertion is...

latitudes. It is a highly elliptical orbit with an inclination of 63.4 degrees, an argument of perigee of 270 degrees, and an orbital period of approximately...

line. There are three types of radial trajectories (orbits). Radial elliptic trajectory: an orbit corresponding to the part of a degenerate ellipse from...

G M r − r S {\displaystyle v={\sqrt {\frac {GM}{r-r_{S}}}}} Elliptic orbit List of orbits Two-body problem Lissauer, Jack J.; de Pater, Imke (2019). Fundamental...

The orbit of either body in the reference frame of the other is also an ellipse, with the other body at the same focus. Keplerian elliptical orbits are...

is the orbit radius, v is the orbital speed, ω is the angular speed, and T is the orbital period. This can be generalized for elliptic orbits: μ = 4 π...

trajectory In orbital mechanics, a Lissajous orbit (pronounced [li.sa.ʒu]), named after Jules Antoine Lissajous, is a quasi-periodic orbital trajectory that...

spaceflight. During freefall the trajectory is part of an elliptic orbit as given by the orbit equation. The perigee distance is less than the radius of...

unique characteristics of HEO use this orbit. A special case of a high Earth orbit is the highly elliptical orbit where altitude at perigee may reach as...

lost in the system while the work is being done. For any Keplerian orbit (elliptic, parabolic, hyperbolic, or radial), the vis-viva equation: 30  is as...

mechanics, the mean anomaly is the fraction of an elliptical orbit's period that has elapsed since the orbiting body passed periapsis, expressed as an angle...