时间误差对恒星视位置计算的影响

Influence of Time Error on the Apparent Position Calculation of Stars

一般计算恒星视位置时需要精确的时间信息,对时间误差对于恒星视位置的影响研究相对较少。考虑到计算恒星视位置需要进行各种修正,这里依次研究了时间误差对岁差改正、自行改正、章动改正、视差改正和光行差改正模型的影响。通过综合分析得出时间误差对恒星视位置经纬度计算带来的影响,通过实验数据对时间误差带来的影响进行了论证,数据分析表明当时间误差值小于10 min时,恒星视位置的经度计算误差要小于10^(-3″);而纬度计算误差要小于10^(-4″)的数量级,在不影响解算精度的情况下,将大幅降低对于时间精度的要求。

In general, precise temporal information is needed to calculate the apparent position of stars, and relatively little is done about the influence of time errors on the apparent positions of stars.In view of the calculation of the apparent position of stars, a variety of corrections are needed.The influence of time errors on precession correction, self correction, nutation correction, parallax correction and optical shift correction model are investigated in turn, the influence of time error on the apparent position and latitude and longitude of the star is obtained by comprehensive analysis.The influence of time error is proved by the experimental data, the data analysis shows that when the time error is less than 10min, the longitude of the stellar position is less than 10-3″, and the latitude calculation error is less than 10-4″.It will greatly reduce the requirement of time precision without affecting the accuracy of calculation.