DART小行星撞击太空
(原标题: DART Asteroid Impact from Space)
2022-09-29
浏览次数: 19
撞击前15天，DART航天器部署了一颗小型伴星，以记录其历史性的行星防御技术演示。由意大利航天局提供的意大利小行星成像立方体卫星（又名LICIACube）记录了这张事件后的图像。在DART撞击目标小行星Dimorphos的几分钟后，在画面的右侧边缘可以看到一团喷射物，而licicube距离它大约80公里远。目前距离地球约1100万公里，直径160米的Dimorphos是一颗围绕直径780米的小行星Didymos运行的小卫星。在licicube的图像中，可以看到Didymos偏离中心。在接下来的几周内，地面望远镜观测将寻找Dimorphos在Didymos周围轨道上的微小变化，以评估DART撞击使其目标偏转的有效程度。
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Fifteen days before impact, the DART spacecraft deployed a small companion satellite to document its historic planetary defense technology demonstration. Provided by the Italian Space Agency, the Light Italian CubeSat for Imaging Asteroids, aka LICIACube, recorded this image of the event's aftermath. A cloud of ejecta is seen near the right edge of the frame captured only minutes following DART's impact with target asteroid Dimorphos while LICIACube was about 80 kilometers away. Presently about 11 million kilometers from Earth, 160 meter diameter Dimorphos is a moonlet orbiting 780 meter diameter asteroid Didymos. Didymos is seen off center in the LICIACube image. Over the coming weeks, ground-based telescopic observations will look for a small change in Dimorphos' orbit around Didymos to evaluate how effectively the DART impact deflected its target.