periapsis

According to integral Jacobi constant , the spacecraft zero-velocity curves in the vicinity of asteroid is described and feasible motion regime is analyzed . Limited condition and periapsis radius corresponding to difference eccentricity against impact surface of the asteroid Ivar is presented .

利用Jacobi积分常数绘制了航天器在Ivar周围的零速度曲线，并分析了航天器的可能运动区域，给出了航天器不碰撞小行星Ivar的边界条件及不同偏心率下的近拱点半径。

The angular distance of a point in an orbit past the point of periapsis measured in degrees .

穿过用角度来测量的进拱点的一个轨道里的某点的角距离。

The repeated thrust applications at apoapsis would raise periapsis from inside to outside the stationary orbit .

重复在远心点施以推力，会将近心点由同步轨道内提升到同步轨道外。

Periapsis in Earth orbit ; the point in its orbit where a satellite is nearest to the Earth .

以地球为中心的最近点；人造卫星轨道上离地球中心最近的点。