The Astrometric Performance of the China Space Station Telescope(CSST)Sky Survey in Extending the Gaia Celestial Reference Frame  

作　　者：Jun Yao Jia-Cheng Liu Niu Liu Zi Zhu Zhen-Wei Wang 

机构地区：[1]School of Astronomy and Space Science,Key Laboratory of Modern Astronomy and Astrophysics(Ministry of Education),Nanjing University,Nanjing 210023,China [2]University of Chinese Academy of Sciences,Nanjing 211135,China

出　　处：《Research in Astronomy and Astrophysics》2024年第8期133-140,共8页天文和天体物理学研究（英文版）

基　　金：funded by the science research grants from the China Manned Space Project with NO.CMS-CSST-2021-A11and NO.CMS-CSST-2021-B10;the National Natural Science Foundation of China(NSFC)under grant No.12373074。

摘　　要：The multi-color imaging sky survey conducted by the China Space Station Telescope(CSST)holds significant promise for advancing the development of the celestial reference frame.In this study,we focus on assessing the astrometric performance of the CSST celestial reference frame(CSST-CRF)in extending the Gaia Celestial Reference Frame 3(Gaia-CRF3).First,the orientation precision of the CSST reference frame is evaluated using a simulated set of extragalactic sources with CSST g magnitudes ranging from 18 to 25 mag.The estimated orientation uncertainty caused by random error insignificantly affects the alignment between Gaia-CRF3 and the CSST-CRF.Then,the systematic effect of incomplete CSST sky coverage on the alignment between CSST-CRF and Gaia-CRF3 is discussed by analyzing the differences between the subset of Gaia-CRF3 in the CSST observation region(Gaia-CRF3′)and Gaia-CRF3 as a whole.Using the third International Celestial Reference Frame(ICRF3)S/X band as an intermediate reference frame,the orientation offset between Gaia-CRF3′and GaiaCRF3 is estimated to be 20μas.This offset is marginally larger than the orientation offset between Gaia-CRF3 and the ICRF3,approximately 15μas.The residual spin and glide rate of Gaia-CRF3′are derived from the proper motions,consistent with that of Gaia-CRF3 within the formal error.Finally,we explore the role of CSST in establishing a multi-band celestial reference frame by comparing its limiting magnitude and observation accuracy with existing catalogs in the infrared and ultraviolet bands.Thanks to its broad wavelength coverage and highprecision measurements,CSST is well-positioned to make significant contributions to the development of a multiband celestial reference frame.

关 键 词：astrometry-reference systems-surveys 

分 类 号：P111[天文地球—天文学]