中文摘要：

利用新发表的高精度、高密度天体测量星表UCAC2，对天王星的五颗主要卫星的CCD观测图像重新进行量测，采用不同方法作定标归算，并使用两种理论模型（GUST86和GUST06模型）计算卫星的理论位置。对不同方法所得到的卫星位置的O-C结果的分析和比较表明，本文获得的卫星位置精度，除天卫五（Miranda）有显著提高，其他4颗卫星的位置精度基本相同。本文中天卫一和天卫三的结果与“亮卫星定标法”的结果在精度上相当，天卫二的位置精度与其他天王星卫星的位置精度具有较好的一致性，这从另一方面证明了我们的“亮卫星定标法”的可靠性。此外我们还获得了天卫四的位置与精度。

英文摘要：

The positions of 5 Uranian satellites on the previous CCD images are measured anew with the aid of the high-precision and high-dense star catalog UCAC2, the different methods are applied to the calibrating measurements, and the theoretical positions of Uranian satellites are calculated by using the two theoretical models （GUST86 and GUST06）. The analysis and comparison of O-C results obtained with the different methods show that the positioning precision obtained in this study for Miranda has been improved greatly while the positioning precisions for the other 4 Uranian satellites are close to each other. The positioning precisions for Ariel and Titania are consistent with that obtained with the ＂light satellite method＂ and the positioning precision for Umbriel shows consistency with the other Uranian satellites, which proves the credibility of the ＂light satellite method＂. Furthermore the positioning precision for Oberon is obtained.