基于 Gaia DR3 的 2013-2020 年间五颗主要天王星卫星观测数据

H. Y. Zhang, Y. Yu, R. C. Qiao, D. Yan, X. Cheng, K. Tang and Y. D. Mao
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摘要

云南天文台从 2013 年到 2020 年利用 1.0 米天体反射望远镜共收集了 10339 个天王星五颗主要卫星(艾瑞尔星、翁布瑞尔星、泰坦尼娅星、奥伯龙星和米兰达星)的位置。采用了中值滤波方法来减少天王星亮晕的影响。所有CCD观测数据均由新开发的CCD图像处理软件以Gaia DR3为参考星表进行分析。评估了不同曝光时间对卫星定位精度的影响。卫星的观测位置与 Institut de Mécanique Céleste et de Calcul des Éphémérides (DE441 and Lainey et al. 2015) 的理论位置进行了比较,五颗卫星的平均偏差在 R.A.和 decl. 范围内从-0.″115 到 0.″103。天王星四颗最大卫星偏移量的标准偏差为 0.″008 至 0.″086 ,米兰达卫星偏移量的标准偏差为 0.″037 至 0.″132 。这些对天王星五颗主要卫星长达 8 年的精确观测将对改进天王星及其五颗主要卫星的轨道参数非常有用。
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Observations of Five Major Uranian Satellites during 2013–2020 Based on Gaia DR3
A total of 10,339 positions of the five major Uranian satellites (Ariel, Umbriel, Titania, Oberon and Miranda) were collected at the Yunnan Observatories from 2013 to 2020 with the 1.0 m astrometric reflector. A median filtering method was applied to reduce the influence of the bright Uranus halo. All CCD observational data was analyzed by the newly developed CCD image-processing software with Gaia DR3 as the reference catalog. The impact of different exposure times on satellite positioning accuracy was evaluated. The observational positions of satellites were compared with theoretical positions from Institut de Mécanique Céleste et de Calcul des Éphémérides (DE441 and Lainey et al. 2015) and the mean offsets are from −0.″115 to 0.″103 in both R.A. and decl. for the five satellites. The standard deviation of the offsets are from 0.″008 to 0.″086 for the four greatest Uranian satellites and from 0.″037 to 0.″132 for Miranda in each direction. These precise observations of the five major Uranian satellites over an 8 yr period will be very useful for improving the orbital parameters of both Uranus and its five major satellites.
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