Utilization of an H-reversal trajectory of a solar sail for asteroid deflection

Utilization of an H-reversal trajectory of a solar sail for asteroid deflection
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利用太阳帆的 H 反转轨迹来偏转小行星

DOI:
10.1088/1674-4527/11/10/001
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发表时间:
2011-08
影响因子:
1.8
通讯作者:
Zeng, Xiang-Yuan
Zeng, Xiang-Yuan
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Gong, Sheng-Ping;Li, Jun-Feng;Zeng, Xiang-Yuan

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近地小行星有可能与地球相撞,在地球上总是有一根线。本文提出了一种改变小行星运行轨迹以避免撞击的方法。小行星偏转利用太阳帆在H-反轨道上演化。首先,分析了太阳帆的动力学和H逆轨迹的特点。然后,对太阳帆的姿态进行优化,以引导太阳帆沿H反轨迹与目标小行星相撞。撞击速度取决于两个重要参数:沿弹道的最小太阳距离和光亮数。明度数越大,太阳距离越小,撞击速度越快。最后,讨论了太阳帆与小行星沿H-反转方向碰撞时的偏转能力。结果表明,一个10公斤重的太阳帆,提前期为一年,可以在2029年将阿波菲斯移出600米的锁孔区域,以消除其在2036年共振返回的可能性。
Near Earth Asteroids have a possibility of impacting with the Earth and always have a thread on the Earth. This paper proposes a way of changing the trajectory of the asteroid to avoid the impaction. Solar sail evolving in a H-reversal trajectory is utilized for asteroid deflection. Firstly, the dynamics of solar sail and the characteristics of the H-reversal trajectory are analyzed. Then, the attitude of the solar sail is optimized to guide the sail to impact with the object asteroid along a H-reversal trajectory. The impact velocity depends on two important parameters: the minimum solar distance along the trajectory and lightness number. A larger lightness number and a smaller solar distance lead to a higher impact velocity. Finally, the deflection capability of a solar sail impacting with the asteroid along the H-reversal is discussed. The results show that a 10 kg solar sail with a lead-time of one year can move Apophis out of a 600-m keyhole area in 2029 to eliminate the possibility of its resonant return in 2036.
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