近地天体望远镜增加卡氏内氏焦点的可行性研究
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1.中国科学院紫金山天文台南京210023;2.中国科学院行星科学重点实验室南京210023;3.中国科学院红外探测与成像技术重点实验室上海200083;4.中国科学院比较行星学卓越创新中心合肥230026)

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国家自然科学基金项目(11633009、11273067)资助


Feasibility Study on the Addition of Cassegrain Focus and Nasmyth Focus to the China Near Earth Object Survey Telescope
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1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023;2. Key Laboratory for Planetary Sciences, Chinese Academy of Sciences, Nanjing 210023;3. Key Laboratory of Infrared System Detection and Imaging Technology, Chinese Academy of Sciences, Shanghai 200083;4. Center for Excellence in Comparative Planetology, Chinese Academy of Sciences, Hefei 230026;

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    摘要:

    近地天体望远镜是巡天望远镜, 具有短焦距、大视场、低空间分辨率的光学特点. 望远镜只有一个主焦点, 焦距1.8 m, 底片比例9um/', 像斑几何能量集中度EE80 ≤2'(像斑环绕能量的80%,即80% encircled energy, 记为EE80), 有效视场直径为4.28-°(14.3deg2), 目前配10k times 10k的STA1600LN CCD (charge-coupled device) camera, 观测视场为9deg2. 通过光学系统设计, 在原光学系统上增加副镜及场改正镜, 获得了焦距9m的卡氏焦点和内氏焦点,底片比例43.6 um /",在直径15'的可用视场内,像斑EE80≤0.5",为近地天体望远镜实现多终端观测提供了理论依据.

    Abstract:

    As a typical Schmidt telescope, China Near Earth Object Survey Telescope (CNEOST) has the optical characteristics of short focal length, large field of view, and low spatial resolution. The optical system has a prime focus with a focal length of 1.8 m, the film scale of 9um/', and the geometric encircled energy concentration EE80 ≤2'. The diameter of the optical FOV (field of view) is 4.28-°(14.3deg2), and the observational FOV is 9deg2 with the equipment of the current 10k times 10k STA1600LN CCD (charge-coupled device) camera. In order to expand the observation capacity of the telescope, a secondary mirror and a field corrector are added in the original optical system, and the Cassegrain focus and Nasmyth focus with a focal length of 9m can be obtained. The diameter of the optical FOV of new focus is 15', and the geometric encircled energy concentration EE80 EE80≤0.5". It provides a prerequisite for high-resolution photography, spectrum, and high-precision multicolor photometry of solar system small bodies.

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照日格图,赵海斌.近地天体望远镜增加卡氏内氏焦点的可行性研究[J].天文学报,2020,(6):1-12.

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  • 收稿日期:2020-01-15
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  • 在线发布日期: 2020-12-04
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