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Apsis

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Apsis
Related Category: Astronomy: General
(pl. apsides), point in the orbit of a body where the body is neither approaching nor receding from another body about which it revolves. Any elliptical orbit has two apsides.

 


apsis
Either of the points in the orbit of a celestial object that is farthest from or closest to the body being orbited. The closest point is the periapsis, the further point the apoapsis.

apsis
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Apogee - Perigee Photographic Size Comparison
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Apoapsis
the point in orbit farthest from the planet.
Apogee
the point in orbit farthest from the Earth.

APOAPSIS
For an object orbiting a celestial body, the apoapsis is the point in its orbit which is farthest from that body.
APOGEE
For an object orbiting the Earth, the apogee is the point in its orbit which is farthest from the Earth.

PERIAPSIS
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That cannonball would skim past the south pole, and climb right back up to the same altitude from which it was fired, just like the cartoon shows. Its orbit is an ellipse.

periapsis
The point in an orbit when two objects are closest together. Special names are given to this point for commonly used systems: see periastron, perihelion, and perigee. The opposite of apoapsis.

Periapsis
The point in the orbit of a satellite where it is closest to its primary.
Periastron ...

periapsis
The point in the orbit closest to the planet.
periastron
The point of closest approach of two stars, as in a binary star orbit.

apoapsis (Imagine the Universe Dictionary - NASA GSFC) The point in an orbit when the two objects are farthest apart. Special names are given to this orbital point for commonly used systems.

apoapsis That point in an orbit farthest from the center of attraction. apocenter = apofocus apocynthion That point in the orbit of a moon satellite which is farthest from the moon.

antipodal point the point that is directly on the opposite side of the planet aphelion the point in its orbit where a planet is farthest from the Sun; when refering to objects orbiting the Earth the term apogee is used; the term apoapsis is used for ...

Nozomi will be inserted into a highly eccentric Mars orbit with a periapsis 300 km above the surface, an apoapsis of 15 Mars radii, and an inclination of 170 degrees with respect to the ecliptic plane.

Comets, which are composed largely of volatile ices and whose orbits are highly eccentric, generally having a periapsis within the orbit of the inner planets and an apoapsis out past Pluto.

This contains the explanation of the motion of the apsis which had previously puzzled astronomers, ...

At its apoapsis (greatest distance), Nereid is nearly seven times as far from Neptune as at its periapsis (smallest distance). Even at its closest approach, Nereid is nearly four times the distance of Triton, Neptune's second most distant satellite.

See ideal gas. [H76] Periapsis
The point in the orbit of a satellite where it is closest to its primary. [H76] Periastron
The point in the orbit of one component of a binary system where it is nearest the other component. [H76] Pericenter ...

The semimajor axis of a planetary orbit is also the average distance from the planet to its primary. The periapsis and apoapsis distances can be calculated from the semimajor axis and the eccentricity by rp = a(1-e) and ra = a(1+e).

distance and time) around a star where the object's distance (on its elliptical orbit) from its parent star is farthest / closest. The terms apogee & perigee are used instead when referring to objects orbiting the Earth (e.g. the Moon); apoapsis ...

See also: Orbit, Planet, Period, Moon, Earth