7 Conclusion and perspectives

As the conclusion, we should point out the fact that, using the high latitude position of the station within the cooperation between CSAO and VS NIIFTRIand the optical square with an angle of $45^\circ$, this catalogue is the first one without any blind zone and has a coverage of $65^\circ$.The detectors can reach magnitude 9.5, and observations could be made down to temperature $-35^\circ {\rm C}$, which is an improvement regarding other similar instruments.

Even though the Hipparcos catalogue comes into use, observing some bright stars well-chosen by ground-based instrumentations repeatedly is still useful for maintenance of the Hipparcos reference system and for improvement of the Hipparcos proper motion system. On the other hand, observing some radio stars is helpful for connecting the Hipparcos reference system to the radio reference system.

Acknowledgements

The authors would like to give many thanks to the China National Natural Science Foundation, to the Bureau of Basic Research and Bureau of International Cooperation of the Chinese Academy of Sciences, and the China Astronomical Committee, which give our project great support in every step of this cooperation. We also offer many thanks to the Russian Ministry of Science and Technology Policy, which gives the cooperation strong support.