在1I/2017 U1 ("Oumuamua") 轨道上的非重力加速度
Marco Micheli1,2, Davide Farnocchia3, Karen J Meech4
1ESA SSA-NEO Coordination Centre, Frascati, Italy. marco.micheli@esa.int.
Nature
|June 29, 2018
概括
第一个星际访客,
科学领域:
- 天文学与天体物理学
- 星球科学
背景情况:
- 乌穆阿穆 (1I/2017 U1) 是我们太阳系中第一个观测到的星际天体.
- 它不寻常的轨迹,延长的形状,和翻转的旋转,类似彗星核,但缺乏彗星活动.
- 天体运动主要由引力控制,但非引力力量可以改变轨迹,尤其是彗星.
研究的目的:
- 检测和量化Oumuamua运动中的非重力加速.
- 确定从纯重力驱动的轨迹观察到的物理原因.
- 探索可能的解释为'Oumuamua的独特行为.
主要方法:
- 来自地面和轨道天文台的大量成像数据的分析.
- 在长的观测弧度上应用天文测量.
- 模拟轨道偏差,排除各种物理和几何效应.
主要成果:
- 在30σ显著度的Oumuamua运动中检测出非重力加速.
- 观测到的加速与日中心辐射力相称r-2或r-1.
- 太阳辐射压力,阻力,太阳风相互作用和几何效应被排除为主要原因.
结论:
- 彗星般的排气被认为是Oumuamua非重力加速的物理可行解释.
- "奥穆阿穆的热特性必须与彗星相似,
- 这一发现为星际物体的性质和行为提供了关键的洞察力.
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