摘要
采用上海天文台佘山40cm折射望远镜所拍摄的6张底片，以PPM星表作为初始参考星表，按中心重叠法进行了归算，得到河外星系NGC7302的位置与自行，以及周围天区11颗星的高精度位置和自行，它们的标准误差均好于30mas和0．7mas／a。其中有4颗是依巴谷星，它们的赤经和赤纬自行精度的平均值分别为0．024ms／a和0．21mas／a。
Six exposures on 6 plates of the epoch differences up to 31 years, which were taken with the 40cm astrographic refractor at Sheshan station of Shanghai Astronomical observatory,were reduced. Taking the PPM catalogue as the initial reference catalogue and using the central overlapping method with the iteration process, we obtained the position and 'proper motion' of NGC7302 and high - precision positions and proper motions of 11 stars around the galaxy. The standard errors of positions are better than 30mas, and the standard errors of proper motions are better than 0. 7mas/a. There are 4 Hipparcos stars among the 11 stars.The mean internal errors of proper motions of them in right ascension and declination are 0. 024ms/a and 0. 21mas/a, respectively.
出处
《中国科学院上海天文台年刊》
1998年第19期35-39,共5页
Annals Shanghai Astronomical Observatory Chinese Academy of Sciences
基金
国家自然科学基金
