摘要
本文简述了从弧长差推算天球参考架局部形变的基本原理，并以国际地球自转服务三个最新版本的河外射电源表为例进行具体分析，结果表明目前国际地球自转服务的天球参考架在部分天区存在毫角秒量级的相对形变，文章简要分析了产生形变的原因。
Methods concerning the identification of local deformations of celestial refer-ence frames by means of arc-lehgth differences are discussed in this paper. Nu-merical examples are given by analyzing the three updated versions of IERS Extragalactic Radio Source Catalogs, i. e., RSC 90 C 01, RSC 91 C 01 and RSC 92 C 01. Results suggest that local deformations with amplitudes up to 2 mas exist in some areas of the sky. These may be attributed to uncertainties in the adopted values of some constants, such as the precession constant and the amplitudes of some nutation terms.
出处
《中国科学院上海天文台年刊》
1994年第15期98-105,共8页
Annals Shanghai Astronomical Observatory Chinese Academy of Sciences
