标题： 面向亚微角秒的相对论天体测量模型 显示英文标题

标题： Towards sub-microarcsecond models for relativistic astrometry

摘要： 天体测量空间任务如盖亚任务已经促进了相对论天体测量学领域的快速发展。 该领域的现有研究旨在达到显著小于微角秒的精度。 我们回顾相对论天体测量学的现状。 就光线传播问题而言，我们面临两个问题：BCRS度规的形式和光线方程的解。 最后，简要提及该领域的正在进行的工作。 显示英文摘要

摘要： Astrometric space missions like Gaia have stimulated a rapid advance in the field of relativistic astrometry. Present investigations in that field aim at accuracies significantly less than a microarcsecond. We review the present status of relativistic astrometry. As far as the problem of light propagation is concerned we face two problems: the form of the BCRS metric and solutions to the light-ray equation. Finally, work in progress in that field is briefly mentioned.