The observational positions and proper motions for 31 radio stars are presented in Table 1 (click here): in Col. 1 is the serial number, in Col. 2 the name of the radio stsrs, in Col. 3 the magnitude, in Cols. 4 and 6 are the right ascension and declination for the observational epoch and equinox J2000.0, in Cols. 5 and 7 are the mean square error in right ascension and in declination, respectively, in Cols. 8 and 9 are the proper motion per year in right ascension and its mean square error, in Cols. 10 and 11 are the proper motion per year in declination and its mean square error, in Col. 12 is the mean epoch of observation and in Col. 13 is the serial number of the Hipparcos Input Catalogue.
Some of these radio stars are also found in the PPM (Röser et al. 1989) and CAMC (CAMC 1989) catalogues. In Figs. 1 (click here)a and 1b the differences of the proper motions both (Shanghai-PPM) and (Shanghai- CAMC) in right ascension and declination are shown respectively. In Figs. 2 (click here)a and 2b the differences of the proper motions respectively between PPM and CAMC in right ascension and declination are given. The comparison between Figs. 1 (click here) and 2 (click here) indicates that our results of the proper motions coincide in general with those of the PPM and CAMC catalogues. But for the proper motion in right ascension of the radio star R COM, there is possibly a few deviations between the PPM and the CAMC or ours.
Table 1: Observational positions and proper motions of 31 radio
stars
Figure 1: Differences of the proper motions in right ascension a)
and declination; b) 
(Shanghai-CAMC); +:
(Shanghai-PPM)
Figure 2: Differences of the proper motions in right ascension a)
and declination; b) (PPM-CAMA)
Acknowledgements
The authors wish to thank Dr. H. Schwan, Astronomisches Rechen-Institut Heidelberg, for his valuable discussion in the process of the catalogue differences. This work is supported by the National Natural Science Foundation of China (No. 19073014).