General status of the Gaia mission and expected performance

General status of the Gaia mission and expected performance
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盖亚任务的总体状况和预期绩效

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发表时间：
2010
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通讯作者：
T. Prusti
T. Prusti
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作者：
T. Prusti

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盖亚是欧空局的一项使命，旨在对我们的银河系进行普查。这是用一个 将两个视场组合成一个焦平面的三个仪器套件。 所有源的机载检测将确保到20日的无偏差调查 大小除了天体测量外，光度测量也可以测量到20等。 第三，光谱仪器将提供径向速度下降到17日 银河系的恒星数量目前，科学要求 除了在天体测量学中额外努力的明亮恒星外， 需要将剩余的μ arcsec挤出位置 信息误差预算在中等星等范围内（15等），使命视差结束 误差在10 ~ 25 μ arcsec之间，测光误差在5 ~ 16毫米口径亮星的径向速度优于1 km s-1， 对于最暗的，误差增加到15 km s-1。目前有 没有无法解决的技术挑战摆在桌面上，盖亚正在向发射迈进 2012年
Gaia is an ESA mission to build a census of our Milky Way Galaxy. This is done with a suite of three instruments combining two fields of view into a single focal plane. On-board detection of all sources will ensure a bias free survey down to the 20th magnitude. In addition to astrometry also photometry is done down to the 20th magnitude. The third, spectroscopic instrument will provide radial velocities down to the 17th magnitude of the Galactic stellar population. Currently the scientific requirements on Gaia are largely met except for bright stars for which in astrometry additional efforts are needed to squeeze the remaining μ arcsecs out of the positional information error budgets. In the mid-magnitude range (15 mag) the end of mission parallax errors are from 10 to 25  μ arcsec and photometry errors are between 5 and 16 mmag. Radial velocities are better than 1 km s -1 for the bright stars with errors increasing to 15 km s -1 for the faintest ones. At the moment there are no unsolvable technical challenges on the table and Gaia is progressing toward the launch in 2012.