利用航天器在限制开普勒运动中偏转小行星
Asteroid Deflection Using a Spacecraft in Restricted Keplerian Motion
摘要：
描述和评价了一种小行星偏转方法，该方法利用航天器在围绕小行星的适当开普勒轨道的一段上来回移动。它表明，平均而言，航天器描述这样的轨迹可以施加一个显着更大的力在小行星上比，例如一个固定的重力牵引车，从而减少所需的时间来影响所需的速度变化的小行星。此外，目前的方法不需要在航天器上安装倾斜的推进器（与固定的重力牵引器不同），从而显著减少了使小行星速度发生给定变化所需的燃料量。此外，该方法允许同时使用几个航天器，进一步加强了对小行星的整体牵引作用，并在航天器之间分配推力需求。
英文摘要：
A method for asteroid deflection that makes use of a spacecraft moving back and forth on a segment of an appropriate Keplerian orbit about the asteroid is described and evaluated. It is shown that, on average, the spacecraft describing such a trajectory can exert a significantly larger force on the asteroid than e.g. a stationary gravity tractor, thereby reducing the time needed to effect a desired velocity change for the asteroid. Furthermore, the current method does not require canted thrusters on the spacecraft (unlike a stationary gravity tractor), markedly reducing the amount of fuel needed to create a given change in the asteroid velocity. In addition, the method allows for the simultaneous use of several spacecraft, further strengthening the overall tugging effect on the asteroid, and distributing the thrust requirement among the spacecraft.
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