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arXiv 1609.04153astro-ph.IM
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盖亚任务

The Gaia mission

Gaia Collaboration

摘要:

盖亚是欧洲航天局(欧空局)科学方案的一项基石任务。航天器的建造于2006年获得批准,此前进行了一项研究,将最初的干涉测量概念改为直接成像方法。航天器和有效载荷都是由欧洲工业制造的。科学界的参与侧重于数据处理,2007年选择了国际盖亚数据处理和分析联合会(DPAC)。盖亚于2013年12月19日发射,并于几周后到达其运行点,即太阳-地球-月球系统的第二个拉格朗日点。航天器和有效载荷的调试于2014年7月19日完成。名义上为期五年的任务开始于为期四周的特殊黄道极扫描,随后转入全天扫描模式。我们回顾了盖亚的科学目标,并描述了目前(2016年中期)正在运行以实现这些目标的建造航天器。我们特别关注有效载荷模块,其性能与飞行任务的科学性能密切相关。我们提供了调试活动和调查结果的总结,然后是常规操作模式的描述。我们总结了在轨运行的基础上的科学性能估计。已计划发布若干中期盖亚数据,这些数据可从盖亚档案中检索,该档案可通过盖亚主页http://www.cosmos.esa.int/gaia查阅。

英文摘要:

Gaia is a cornerstone mission in the science programme of the European Space Agency (ESA). The spacecraft construction was approved in 2006, following a study in which the original interferometric concept was changed to a direct-imaging approach. Both the spacecraft and the payload were built by European industry. The involvement of the scientific community focusses on data processing for which the international Gaia Data Processing and Analysis Consortium (DPAC) was selected in 2007. Gaia was launched on 19 December 2013 and arrived at its operating point, the second Lagrange point of the Sun-Earth-Moon system, a few weeks later. The commissioning of the spacecraft and payload was completed on 19 July 2014. The nominal five-year mission started with four weeks of special, ecliptic-pole scanning and subsequently transferred into full-sky scanning mode. We recall the scientific goals of Gaia and give a description of the as-built spacecraft that is currently (mid-2016) being operated to achieve these goals. We pay special attention to the payload module, the performance of which is closely related to the scientific performance of the mission. We provide a summary of the commissioning activities and findings, followed by a description of the routine operational mode. We summarise scientific performance estimates on the basis of in-orbit operations. Several intermediate Gaia data releases are planned and the data can be retrieved from the Gaia Archive, which is available through the Gaia home page at http://www.cosmos.esa.int/gaia.

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。

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