天球参考架零点的测定(Ⅲ)─—用不同小行星测零点改正的权重

Determination of the Zero Point of Celestial Reference ? he Weight of Zero Point Correction by Using Different Asteroids

从以往的资料看出，太阳系天体中不同观测对象对天球参考架零点改正的权重是不同的，以不同的小行星为观测对象，其零点改正的结果之间也有较大的差异，因为它们的轨道根数是不相同，本文利用最小二乘法方法分析了不同类型轨道的小行星在测定Ｅ和Ｄ改正时最或然值的偏差量以及必须满足的观测条件。此工作是为今后有效地选取合适的小行星观测来测定零点改正作准备；同时。

From previous results, it is found that the weight of different astroid utilization to determine the celestial reference ,s zero point is different because their orbitsare not the same. In this paper, we discuss the condition needed for observation, and analyse the solution deviation for E and D. This work is preparaed for further research that can provide a standard for selecting the proper asteroids to determine the zero point of the reference. Meanwhile, it can also analyse the precision of E and D determined in practice.