2015-2016年使用盖亚DR1的希马利亚精确CCD位置
Precise CCD positions of Himalia using Gaia DR1 in 2015-2016
摘要：
为了获得第六颗木星卫星Himalia的高精度CCD位置，在2015-2016年期间共获得了598次CCD观测。利用云南天文台的2.4米和1米望远镜进行了27个昼夜的观测。分析了影响喜玛拉雅星定位精度的几个因素，包括所用的参考星表、几何畸变和相位效应。最近公布的盖亚DR 1星表利用其前所未有的位置精确度，被选为与喜玛拉雅和疏散星团CCD框架中的参考星相匹配的参考星，这些参考星被观测用于推导几何畸变。最新版本的SOFA库被用来计算参考星的位置。喜玛拉雅的理论位置是从喷气推进实验室地平线系统中检索出来的，该系统包括卫星星历JUP 300，而木星的位置是基于行星星历DE 431。我们的结果表明，观测到的减去计算（O-C）残差的平均值在赤经和赤经上分别为0.071和-0.001角秒。它们的标准偏差在每个方向上估计约为0.03角秒。
英文摘要：
In order to obtain high precision CCD positions of Himalia, the sixth Jovian satellite, a total of 598 CCD observations have been obtained during the years 2015-2016. The observations were made by using the 2.4 m and 1 m telescopes administered by Yunnan Observatories over 27 nights. Several factors which would influence the positional precision of Himalia were analyzed, including the reference star catalogue used, the geometric distortion and the phase effect. By taking advantage of its unprecedented positional precision, the recently released catalogue Gaia DR1 was chosen to match reference stars in the CCD frames of both Himalia and open clusters which were observed for deriving the geometric distortion. The latest version of SOFA library was used to calculate the positions of reference stars. The theoretical positions of Himalia were retrieved from the Jet Propulsion Laboratory Horizons System which includes the satellite ephemeris JUP300, while the positions of Jupiter were based on the planetary ephemeris DE431. Our results showed that the means of observed minus computed (O-C) residuals are 0.071 and -0.001 arcsec in right ascension and declination, respectively. Their standard deviations are estimated at about 0.03 arcsec in each direction.
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