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An Introduction of the 3rd Realization of the International Celestial Reference Frame (ICRF3)

Zhu, Zi; Liu, Jia-cheng; Liu, Niu +1 more

The 3rd realization of the International Celestial Reference Frame, ICRF3, has been the latest ICRF (the International Celestial Reference Frame) as the replacement of its previous realization, ICRF2, since January 1, 2019. The ICRF3 is aligned to the ICRS (the International Celestial Reference System) to within the accuracy of the ICRF2. After it…

Stellar Proper Motion Study of Crowded Stellar Field of CSST

Tian, Hao; Zhang, Xin; Liu, Chao +7 more

The stellar absolute proper motion of crowded field is an important problem of astrometry. The space-based observation could get high spatially revolved images in the crowded field. The China Space Station Telescope (CSST) can provide high precision absolute proper motion that significantly improve the performance of HST and Gaia in the sky area a…

Utilization of the Archive Data from EXOSAT

Hang, H. R.; Zang, Z. Y.; Han, H. Y.