微角秒精度天文参考系研究

紧密结合国际上天文参考系基础理论和微角秒天体测量发展的需求，针对微角秒天文参考系中的若干重要问题，提出基于Gaia参考架的岁差-章动模型研究，Gaia参考系与恒星自行中的光行差效应研究，及与长期光行差效应密切相关的银河系常数和银河系旋转曲线精确测定等内容。项目紧密围绕微角秒天体测量和天文参考系中的几个核心问题开展研究，将能促进我国在天文参考系理论和应用领域里的研究实力，形成具有一定国际竞争力的研究团队。

The key project is dedicated to several crucial problems about astronomical reference systems with an accuracy of micro-arcsecond level. Based on the best available theories of reference systems and the need of developments in scope of micro-arcsecond astrometry, this research project includes following aspects: (1) Precession-nutation models of the Earth in the Gaia celestial reference system; (2) aberration in proper motions for stars in our Galaxy and its impact on the Gaia celestial reference system; (3) Galactic constants and rotation curve which are closely related to the Galactic aberration effect and reference systems for future research. This project concentrates on certain critical problems on mirco-arcsecond astrometry and reference systems; it will improve significantly the research capability of our country in this field, and construct a research team with international competitiveness.