联合毫弧秒探路者巡天综述
Joint Milli-Arcsecond Pathfinder Survey Overview
摘要：
联合毫弧秒探路者巡天（JMAPS）任务是美国海军部（DoN）的一项天基、全天天体测量亮星巡天任务。JMAPS目前已获得飞行资金，将于2012年发射。JMAPS将制作一个全天天体测量、光度测量和分光星表，涵盖星等1-12等，并将结果扩展到15等，位置精度为1毫角秒，平均观测历元约为2013年。使用依巴谷和第谷1991年的位置数据，每年100微弧秒（umas）的自行应该可以实现所有最亮的恒星，结果是与依巴谷目录相比，该目录将以更低的速度随着时间的推移而退化。JMAPS将使用一个相对较小的孔径、非常高精度的天体测量望远镜在低地球轨道上搭载一颗微型卫星来完成这一任务。任务基线是在900公里太阳同步终止轨道上的三年任务寿命（2012-2015年）。
英文摘要：
The Joint Milli-Arcsecond Pathfinder Survey (JMAPS) mission is a Department of Navy (DoN) space-based, all-sky astrometric bright star survey. JMAPS is currently funded for flight, with at 2012 launch date. JMAPS will produce an all-sky astrometric, photometric and spectroscopic catalog covering the magnitude range of 1-12, with extended results through 15th magnitude at an accuracy of 1 milliarcsecond (mas) positional accuracy at a mean observing epoch of approximately 2013. Using Hipparcos and Tycho positional data from 1991, proper motions with accuracies of 100 microarcseconds (umas) per year should be achievable for all of the brightest stars, with the result that the catalog will degrade at a much reduced rate over time when compared with the Hipparcos catalog. JMAPS will accomplish this with a relatively modest aperture, very high accuracy astrometric telescope flown in low earth orbit (LEO) aboard a microsat. Mission baseline is for a three-year mission life (2012-2015) in a 900 km sun synchronous terminator orbit.
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