摘要
本文用有较长观测间隔的射电源光学对应体的光学观测结果，再次讨论了岁差常数值。由于现用岁差值的不精确，需把这些射电源光学对应体在不同历元的观测结果统一归化到共同参考系统Ｊ２０００．０，并对它们各自的参考星表都归化到ＦＫ５系统，即可得到这些源在ＦＫ５系统中的所谓“自行”．由所得“自行”对岁差常数的改正作了估计。本文还分别对４４颗源和２５颗源作了估算，其相应的岁差改正为－２．６７±１．３３ｍａｓ／年和－３．３１±１．６２ｍａｓ／年，将这些值和由新技术观测所得结果作了比较，两者之间符合得相当好。
In this paper, a discussion of the precession constant is performed by the optical observation of the counterparts of extragalactic radio sources with larger observational intervals. Due to the incorrect value of precession, after reducing the observational catalogues in the FK5 system, the fictitious 'proper motions' of the sources will appear with the observational positions at different epochs in the common reference system J2000.0. With these 'proper motions', the correction of precession has been estimated to be -2.67±1.33 mas/yr for 44 sources, and -3.31±1.62 mas/yr for 25 sources espectively.The results are also compared with thatfrom the modern techniques of astrometry. They are coincident each other.
出处
《天文学报》
CSCD
北大核心
1995年第4期412-418,共7页
Acta Astronomica Sinica
基金
国家自然科学基金
