Abstract

We present the results of the re-reduction of Pulkovo photographic plates with images of Saturn’s major satellites in the Gaia DR2 catalog system (169 plates, 3007 individual positions). Astronegatives were taken with the 26-inch refractor at the Pulkovo Observatory between 1972 and 1982. The intrinsic accuracy of measurement of astronegatives using the Pulkovo MDD system was 1 μm (20 mas on the 26-inch refractor scale). The mean values of O–C differences when compared with the most up-to-date ephemerides vary within ±20 mas. The errors of the annual mean differences are usually better than 20 mas. There is a close agreement between the presented Pulkovo series and the results of the re-reduction of similar USNO observations (mean seasonal differences are less than 50 mas in modulus). Considering that different implementations of modern ephemerides give satellite positions that vary within ±50 mas for the time interval under study, we can conclude that the Pulkovo series is highly informative for improving the motion models of the major satellites of Saturn.

中文翻译：

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普尔科沃玻璃图书馆的天文数字化：1972-1982年期间，土星主要卫星在盖亚DR2系统中的位置

摘要

我们用Gaia DR2目录系统中的土星主要卫星图像（169个板块，3007个单独位置）展示普尔科沃照相板的再缩小结果。1972年至1982年之间，在普尔科沃天文台用26英寸折射仪拍摄了天体含量。使用Pulkovo MDD系统测量天体的本质精度为1μm（26英寸折射仪上为20 mas）。与最新的星历相比，OC差的平均值在±20 mas之内变化。年平均差异的误差通常优于20 mas。提出的普尔科沃级数与类似的USNO观测值的减少结果（平均季节差异的模量小于50 mas）之间有着密切的一致性。