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The proper and space motions of globular cluster NGC 4147 on Hipparcos system.

Wu, Zhenyu; Wang, Jiaji

The positions and proper motions of 82 stars in the field of the globular cluster NGC 4147, reduced with the 11 reference stars from the Hipparcos Catalogue, are kindly provided by M. Geffert, Bonn. 54 of these stars are used as reference stars to re-reduce the observations by Wang & Gupta (1998). Based on the new proper motions obtained from …

Proper motions of Hipparcos stars in two plate areas.

Wang, Shuhe; Tang, Zhenghong; Jin, Wenjing

By using the ACT Reference Catalogue as a preliminary reference catalogue, the authors have reduced 31 exposures on 15 plates in areas of two plates taken with the 40 cm refractor at She-Shan Station of Shanghai Astronomical Observatory. By means of the central overlapping technique and the iterative process, the highly precise positions and prope…

A comparison between the FK5 and Hipparcos catalogues.

Lu, Peizhen; Xu, Tongqi

Through a comparison between the FK5 and Hipparcos catalogues at different epochs, the systematic differences of FK5 are tested and discussed. This shows that the systematic differences in proper motions of FK5 seem to be the primary origin which affects the systematic differences in positions of FK5. In some researches on the secular variation of…