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・ Parabolic bursting
・ Parabolic constant
・ Parabolic coordinates
・ Parabolic cylinder function
・ Parabolic cylindrical coordinates
・ Parabolic fractal distribution
・ Parabolic geometry
・ Parabolic geometry (differential geometry)
・ Parabolic induction
・ Parabolic Lie algebra
・ Parabolic loudspeaker
・ Parabolic microphone
・ Parabolic partial differential equation
・ Parabolic reflector
・ Parabolic SAR
Parabolic trajectory
・ Parabolic trough
・ Paraboloid
・ Paraboloidal coordinates
・ Paraborne Aviation
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・ Parabothus
・ Parabotia
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・ Parabounce
・ Parabrachial area
・ Parabrachionycha
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Parabolic trajectory : ウィキペディア英語版
Parabolic trajectory

In astrodynamics or celestial mechanics a parabolic trajectory is a Kepler orbit with the eccentricity equal to 1. When moving away from the source it is called an escape orbit, otherwise a capture orbit. It is also sometimes referred to as a C3 = 0 orbit (see Characteristic energy).
Under standard assumptions a body traveling along an escape orbit will coast along a parabolic trajectory to infinity, with velocity relative to the central body tending to zero, and therefore will never return. Parabolic trajectories are minimum-energy escape trajectories, separating positive-energy hyperbolic trajectories from negative-energy elliptic orbits.
==Velocity==
Under standard assumptions the orbital velocity (v\,) of a body travelling along parabolic trajectory can be computed as:
:v=\sqrt\cdot v_o
where:
*v_o\, is orbital velocity of a body in circular orbit.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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