Conceptual design study of the science payload for the Earth 2.0 mission

Yonghe Chen; Dayi Yin; Chuanxin Wei; Xiaohua Liu; Quan Zhang; Baoyu Yang; Yuji Zhu; Jian Ge; Dan Zhou; Congcong Zhang; Yan Li; Zongxi Song; Wei Gao; Wei Li; Fengtao Wang; Chao Shen; Yue Pan; Hongfei Zhang; Jian Wang; Hui Wang

doi:10.1117/12.2630044

27 August 2022 Conceptual design study of the science payload for the Earth 2.0 mission

Yonghe Chen, Dayi Yin, Chuanxin Wei, Xiaohua Liu, Quan Zhang, Baoyu Yang, Yuji Zhu, Jian Ge, Dan Zhou, Congcong Zhang, Yan Li, Zongxi Song, Wei Gao, Wei Li, Fengtao Wang, Chao Shen, Yue Pan, Hongfei Zhang, Jian Wang, Hui Wang

Author Affiliations +

Proceedings Volume 12180, Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave; 121804A (2022) https://doi.org/10.1117/12.2630044
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

The Earth 2.0 (ET) mission is a space mission in China which will be operated at the Earth-Sun L2 orbit with a designed lifetime longer than 4 years. ET’s scientific payload consist of six 30cm diameter transit telescopes with each field of view of 500 square degrees and one 35 cm diameter microlensing telescope with a field of view of 4 square degrees. Each telescope is equipped with a camera with 2×2 9K×9K CMOS detectors, and Front-end Electronics (FEE). Each transit telescope is an f/1.57 eightlens refractive optical system while the microlensing telescope is an f/17.2 catadioptric optical system with diffraction-limited design. The diameter of 90% Encircled Energy (EE90) for transit telescopes is within 5×5 pixels while the FWHM of PSF for the microlensing telescope is less than 0.78 arcsec. Fine Guidance Sensors are mounted at the four edges of the CMOS camera. All seven telescopes are fixed on a common mounting reference plate, and a large sun shield is used to block the heat flow from the Sun and provide a stable thermal environment for the telescopes. It also blocks straylight form the Sun, Earth, and the Moon. Each telescope has an additional top hood to block straylight incident at a large angle while the top hood is also used as a radiator to cool the detectors to below - 40°C. With PID heating loops, each telescope will work at -30±0.3°C while the detectors work at - 40±0.1°C. Details of the conceptual design for the scientific payload will be presented.

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Yonghe Chen, Dayi Yin, Chuanxin Wei, Xiaohua Liu, Quan Zhang, Baoyu Yang, Yuji Zhu, Jian Ge, Dan Zhou, Congcong Zhang, Yan Li, Zongxi Song, Wei Gao, Wei Li, Fengtao Wang, Chao Shen, Yue Pan, Hongfei Zhang, Jian Wang, and Hui Wang "Conceptual design study of the science payload for the Earth 2.0 mission", Proc. SPIE 12180, Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave, 121804A (27 August 2022); https://doi.org/10.1117/12.2630044

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