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CCD observations for the Hipparcos star 104297 measured with respect to the Galilean satellite Callisto

Peng, Q. Y.; Li, Z. L.

CCD images for two Galilean satellites: Europa, Callisto and a bright star in Hipparcos Catalogue (No.104297) are obtained on 1 meter telescope at the Yunnan Observatory on the night of Nov.14, 1997. After the two satellites were measured for the scale and orientation of CCD frames, the apparent positions for the star were determined with respect …

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…

Direct demodulation image reconstruction of ME/EXOSAT Galactic Plane Survey.

Lu, Fangjun; Wu, Mei; Li, Tibei +1 more

The authors have reanalyzed the ME/EXOSAT Galactic Plane scan observational data with direct demodulation technique. They have studied the discrete X-ray sources in the regions which were unresolved in previous analyses. Using the bootstrap method, they have analyzed the statistical accuracy of the results and determined the position and flux erro…

Improvement of proper motions for Hipparcos stars with photographic plates.

Wang, Jia-Ji; Tang, Zheng-Hong; Wang, Shu-He +1 more

Using the PPM catalogue as a preliminary reference catalogue, the authors have reduced 17 exposures on 9 plates taken with the 40 cm refractor at Zo-Sè Station of Shanghai Astronomical Observatory in about 30 years. By means of the central overlapping technique and the iterative process, high-precision positions and proper motions of 28 PPM stars,…

The identification of the new gamma-ray pulsar PSR 1055-52 from COS-B data.

Song, L. -M.; Lu, T.

Galactic gamma — ray sources in the 40-50 MeV range

Li, Ti-Pei; Wu, Mei

A gamma-ray map of the Galaxy in 40-50 MeV reveals, besides the three sources known at higher energies, four additional sources with intensities comparable to that of the Crab.