近邻宜居行星巡天计划:利用空间天体测量法寻找下一个"地球"OA北大核心CSTPCD

The Closeby Habitable Exoplanet Survey(CHES)employs state-of-the-art,high-precision astrometry and positioning technology at the microarcsecond level in space.Its primary objective is to conduct a thorough survey of approximately 100 FGK-type stars within the Sun's proximity(within 10 parsecs),with the goal of detecting potentially habitable Earth-like planets or super-Earths.This pio-neering mission involves a detailed census of habitable planets,providing intricate information on their numbers,true masses,and three-dimensional orbits.Notably,CHES marks a historic milestone as the in-augural international space exploration mission exclusively dedicated to the study of terrestrial planets within the nearby habitable zone.CHES's payload features a cutting-edge optical telescope with a 1.2 m aperture,a field of view measuring 0.44°×0.44°,and a focal length of 36 m.The telescope utilizes a coa xial three-mirror TMA optical imaging system.Impressively,CHES is designed with a positioning mea-surement accuracy of 1 μas,solidifying its status as the most precise space exploration project globally in terms of positioning accuracy.To achieve the detection objectives of CHES,it is essential to refine and further substantiate the scientific goals through comprehensive argumentation.Overcoming three key technological challenges is crucial:advancing optical systems for large field of view,developing high-quality space telescopes with minimal distortion;breaking through measurement technology for stellar separations at the 10-5 pixel level;and achieving high stability in satellite system attitude control and thermal control precision.CHES stands on the threshold of groundbreaking discoveries,with the excit-ing prospect of revealing 50 Earth-like planets.This announces a significant leap forward in China's space science exploration technology.