Chemical Composition of Comets

彗星的化学成分

• 批准号: 8820145
• 负责人: Susan Wyckoff
• 金额: $ 19.1万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-05-01 至 1992-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8820145&HistoricalAwards=false
• 关键词: Chemical; Composition; Comets

The appearance of comet Halley in 1985-1988 opened a new era in probing chemical abundances in the early solar nebula with the collection of in situ gas samples by the GIOTTO spacecraft. Moreover, use of state-of-the-art detectors on large ground-based telescopes produced high quality spectrophotometric data ideally suited for determining chemical abundances of the volatile component of the comet nucleus. This grant supports the investigation of the abundances of volatiles in cometary nuclei. The ultimate goal is to relate these abundances to the environment for forming comets in the primitive solar nebula. The approach is to combine efforts of an observationalist and a theorist to constrain a chemical model of a comet coma using high quality ground-based data. The model which incorporates significant chemical and photolytic coma processes will be used to derive the abundances of the parent species in the nucleus. From this research the investigators hope to derive significant constraints on chemical processes which occurred in the coldest regions of the solar nebula 4.5 billion years ago.

1985年至1988年，哈雷（Comet Halley）的出现在探测早期太阳星云中的化学丰度的新时代，并通过乔托航天器收集了原位气体样品。 此外，在大型地面望远镜上使用最先进的探测器可产生高质量的分光光度数据，非常适合确定彗星核挥发性成分的化学丰度。 该赠款支持彗星核中挥发物的丰度的研究。 最终目标是将这些丰度与原始太阳星云中形成彗星的环境联系起来。 这种方法是结合观察主义者和理论家使用高质量地面数据来限制彗星昏迷的化学模型的努力。 结合了重要的化学和光解昏迷过程的模型将用于得出原子核中父物种的丰富性。 从这项研究中，研究人员希望对45亿年前太阳星云最冷地区发生的化学过程产生重大限制。