SIM PlanetQuest轻型（SIM-Lite）飞行任务概念概述
Overview of the SIM PlanetQuest Light (SIM-Lite) mission concept
摘要：
空间干涉测量任务PlanetQuest Light（或SIM-Lite）是一种新的空间天体测量仪器概念，将位于太阳地球拖曳轨道。SIM-Lite利用了过去十年为SIM任务开发的技术。该仪器由两台迈克尔逊恒星干涉仪和一台精密望远镜组成。第一个干涉仪在目标星和一组参考星之间进行切割。第二个干涉仪监测仪器在目标恒星方向上的姿态。望远镜监测仪器在其他两个方向上的姿态。SIM-Lite将能够对6等或更亮的恒星进行一个微弧秒窄角天体测量，相对于2度视场中的9等参考星。在为期5年的任务中，SIM-Lite将在宜居带内搜索65颗质量低至一个地球质量的邻近恒星，这些恒星的轨道周期小于3年。SIM-Lite还将对各种天体物理学对象进行全球天体测量，达到4.5微弧秒的绝对位置和视差测量。作为一种尖端仪器，SIM-Lite在100小时的积分后，将能够在19等视星等物体上实现8微弧秒的天体测量精度，在20等视星等物体上实现15微弧秒的天体测量精度。本文将描述该仪器，它将如何进行天体测量和基于当前技术的预期性能。
英文摘要：
The Space Interferometry Mission PlanetQuest Light (or SIM-Lite) is a new concept for a space borne astrometric instrument, to be located in a solar Earth-trailing orbit. SIM-Lite utilizes technology developed over the past ten years for the SIM mission. The instrument consists of two Michelson stellar interferometers and a precision telescope. The first interferometer chops between the target star and a set of Reference stars. The second interferometer monitors the attitude of the instrument in the direction of the target star. The telescope monitors the attitude of the instrument in the other two directions. SIM-Lite will be capable of one micro-arc-second narrow angle astrometry on magnitude 6 or brighter stars, relative to magnitude 9 Reference stars in a two degree field. During the 5 year mission, SIM-Lite would search 65 nearby stars for planets of masses down to one Earth mass, in the Habitable Zone, which have orbit periods of less than 3 years. SIM-Lite will also perform global astrometry on a variety of astrophysics objects, reaching 4.5 micro-arc-seconds absolute position and parallax measurements. As a pointed instrument, SIM-Lite will be capable of achieving 8 micro-arc-second astrometric accuracy on 19th visual magnitude objects and 15 micro-arc-second astrometric accuracy on 20th visual magnitude objects after 100 hours of integration. This paper will describe the instrument, how it will do its astrometric measurements and the expected performance based on the current technology.
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