中新网北京2月27日电 (记者 孙自法)施普林格·自然旗下专业学术期刊《自然-天文学》最新发表一篇行星科学论文认为,在美国国家航空航天局(NASA)的“双小行星重定向测试”(DART)撞击后,小行星卫星双卫一(Dimorphos)可能被重塑了。结果表明,双卫一在DART撞击后,其形状和轨道可能发生了变化。
这项研究还发现,DART撞击后,双卫一的自转周期缩短了。这表明DART撞击改变了双卫一的转动状态,使其围绕母体小行星迪迪莫斯(Didymos)的公转速度加快了。研究人员认为,这可能是因为DART撞击使双卫一的质量分布发生了变化。
该研究为未来的行星防御任务提供了有价值的信息。利用DART撞击这一“实验”,科学家们能更深入地理解小行星的物理特性和撞击响应机制。这为人类开展行星防御、保护地球安全提供了有力支撑。
Title: Dimorphos may have been reshaped after DART impact
Keywords: DART impact, Dimorphos, planetary science
News content:
The latest research published by the professional academic journal Nature Astronomy under Springer Nature on February 27 shows that after the impact of NASA’s Double Asteroid Redirection Test (DART), the asteroid moonlet Dimorphos may have been reshaped. The results indicate that after the DART impact, the shape and orbit of Dimorphos may have changed.
The study also found that after the DART impact, the rotation period of Dimorphos was shortened. This shows that the DART impact changed the spin state of Dimorphos and accelerated its orbital velocity around the parent asteroid Didymos. Researchers believe this may be because the DART impact caused a change in the mass distribution of Dimorphos.
The study provides valuable information for future planetary defense missions. By using the DART impact as an “experiment”, scientists can gain a deeper understanding of the physical properties and impact response mechanisms of asteroids. This provides strong support for humankind to carry out planetary defense and protect Earth’s safety.
【来源】http://www.chinanews.com/gj/2024/02-27/10170803.shtml
Views: 1