| 释义 |
orbital velocity
orbital velocityn.1. The velocity at which a body revolves about another body.2. The minimum velocity required to place or maintain a satellite in a given orbit.orbital velocity n (Astronomy) the velocity required by a spacecraft, satellite, etc, to enter and maintain a given orbit Translationsorbital velocity
orbital velocity The velocity of a satellite or other orbiting body at any given point in its orbit. It is also the velocity required by a satellite to enter an orbit around a body. The orbital velocity, v, is given by the expression v = √[gR 2(2/r – 1/a )] where R is the radius of the orbited body, r is the distance from the center of mass of the system (i.e. from the approximate center of the primary), a is the semimajor axis of the orbit, and g is the standard acceleration of gravity. For a circular orbit, r = a and the circular velocity is given by v = √(gR 2/r ) To escape from an orbit a must tend to infinity and the escape velocity is then given by v e = √(2gR 2/r ) The orbital period for an elliptical orbit is given by P = 2πa 3/2/√gR 2 orbital velocity[′ȯr·bəd·əl və′läs·əd·ē] (astronomy) The instantaneous velocity at which an earth satellite or other orbiting body travels around the origin of its central force field. |