乌利塞斯航天器在现场检测彗星尘埃轨迹
Harald Krüger1, Peter Strub1,2, Eberhard Grün3,4
1Max-Planck-Institut für Sonnensystemforschung , Göttingen, Germany.
概括
在轨道穿越期间,尤利西斯探测到19颗彗星尘埃颗粒,揭示了对流星流的洞察力,并使彗星和小行星的远程分析成为可能. 这项研究增强了我们对行星间尘埃和未来太空任务能力的理解.
科学领域:
- 太阳系科学 太阳系科学
- 行星科学 行星科学
- 天体物理学 天体物理学
- 星际尘埃动力学 星际尘埃动力学
背景情况:
- 乌利塞斯号航天器从1990年到2007年提供了17年的现场尘埃测量.
- 彗星石流是行星间尘埃云中的微型结构.
- 了解这些流对于描述太阳系的尘埃环境至关重要.
研究的目的:
- 为了在尤利西斯号尘埃数据集中识别彗星流粒子.
- 为了分析乌利塞斯穿越已知的彗星石流.
- 评估彗星和小行星远程组成分析的潜力.
主要方法:
- 利用星际石环境探索 (IMEX) 模型来预测尤利西斯的彗星流相遇.
- 重新分析了尤利西斯号的尘埃数据集,以确定预测的轨道穿越过程中的冲击.
- 与特定的彗星来源相关的检测到的粒子.
主要成果:
- 确定了19个粒子,与1995年和2001年的三次乌利塞斯轨道穿越一致.
- 将粒子起源归因于多达五颗彗星,包括10P/Tempel 2和146P/Shoemaker-LINEAR.
- 确定了轨道内的尘埃空间密度,并发现了微米范围内的粒子半径.
结论:
- 证实了Ulysses遇到的彗星流粒子的存在和组成.
- 证明了跟踪行星间尘埃粒子回到它们的母彗星的可行性.
- 在未来的任务中使用现场尘埃分析仪对天体进行远程组成分析,开辟了新的途径.
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