盖亚计划-技术、性能和现状
The Gaia Project - technique, performance and status
摘要：
盖亚是欧空局的一项卫星任务，旨在以前所未有的精度对大约10亿颗恒星进行绝对天体测量（所有恒星都低至20等）。此外，还将获得所有这些恒星的星等和颜色，而径向速度和光谱特性将仅确定明亮天体（V<17.5）。在15等时，盖亚的目标是20微弧秒（muas）的角精度。只有当望远镜的几何形状、探测器和盖亚在每个时刻的指向（“姿态”）都能从盖亚测量本身以μ A的精度推断出来时，这个目标才能达到。
英文摘要：
Gaia is a satellite mission of the ESA, aiming at absolute astrometric measurements of about one billion stars (all stars down to 20th magnitude, with unprecedented accuracy. Additionally, magnitudes and colors will be obtained for all these stars, while radial-velocities and spectral properties will be determined only for bright objects (V<17.5). At 15th magnitude Gaia aims at an angular accuracy of 20 microarcseconds (muas). This goal can only be reached if the geometry of the telescopes, the detectors, and the pointing of Gaia at each moment ("attitude") can be inferred from the Gaia measurements itself with muas accuracy.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
