Astrometric Reduction of Saturnian Satellites with Cassini-ISS Images Degraded by Trailed Stars  

作　　者：Qing-Feng Zhang Meng-Qi Liu Yan Li Lin-Peng Wu Zhi-Qiang Wang Li-Sha Zhu Zhan Li 

机构地区：[1]Department of Computer Science,Jinan University,Guangzhou 510632,China [2]Sino-French Joint Laboratory for Astrometry,Dynamics and Space Science,Jinan University,Guangzhou 510632,China [3]Department of Financial Technology,School of Management,Guangzhou Xinhua University,Guangzhou 510520,China

出　　处：《Research in Astronomy and Astrophysics》2023年第3期85-92,共8页天文和天体物理学研究（英文版）

基　　金：partly supported by the Joint Research Fund in Astronomy under cooperative agreement between the National Natural Science Foundation of China and Chinese Academy of Sciences(No.U2031104);the National Natural Science Foundation of China(No.62071201);the Natural Science Foundation of Guangdong Province(No.2023A1515011340)。

摘　　要：The Imaging Science Subsystem(ISS)mounted on the Cassini spacecraft has taken a lot of images,which provides an important source of high-precision astrometry of some planets and satellites.However,some of these images are degraded by trailed stars.Previously,these degraded images cannot be used for astrometry.In this paper,a new method is proposed to detect and compute the centers of these trailed stars automatically.The method is then performed on the astrometry of ISS images with trailed stars.Finally,we provided 658 astrometric positions between 2004 and 2017 of several satellites that include Enceladus,Dione,Tethys,Mimas and Rhea.Compared with the JPL ephemeris SAT427,the mean residuals of these measurements are 0.11 km and 0.26 km in R.A.and decl.,respectively.Their standard deviations are 1.08 km and 1.37 km,respectively.The results show that the proposed method performs astrometric measurements of Cassini ISS images with trailed stars effectively.

关 键 词：STARS TRAIL SATURN 

分 类 号：P185.5[天文地球—天文学] V476.4[航空宇航科学与技术—飞行器设计]