依巴谷星(104297)相对于伽里略卫星Callisto的CCD位置测量  

CCD Observations for the Hipparcos Star 104297 Measured with Respect to the Galilean Satellite Callisto

作　　者：彭青玉[1] 李自力[2] 

机构地区：[1]暨南大学计算机科学系 [2]中国科学院云南天文台

出　　处：《天文学报》2002年第1期84-89,共6页Acta Astronomica Sinica

基　　金：暨南大学博士启动基金;暨南大学信息科技学院资助

摘　　要：１９９７年１１月１４日晚，在中国科学院云南天文台１米望远镜上用新安装的１０２４２ＣＣＤ观测到了木星的两颗伽里略卫星；Ｅｕｒｏｐａ和Ｃａｌｌｉｓｔｏ及一颗依巴谷星（星号为 １０４２９７）．当采用新的 ＪＰＬ ＤＥ４０５和 Ｓａｍｐｓｏｎ－Ｌｉｅｓｋｅ理论（Ｇ５）计算卫星的理论位置并相对于Ｃａｌｌｉｓｔｏ测量恒星位置时，视位置的观测值与计算值之差的平均值在赤经和赤纬方向分别为△α＝－０″０２９±０．″０１２，△δ＝０．″００５± ０．″０１１．这对应于平均观测历元（ＵＴ）：１９９７年１１月１４日１３时４３分５０秒．这一试验结果与 Ｃａｓａｓ等在同一时期内ＣＣＤ观测的结果有着很好的一致性 它反映了依巴谷星表体现的光学参考系与ＤＥ４０５体现的动力学参考系在观测历元具有较好的一致性．单次位置测定的标准误差在赤经赤纬方向分别为±０．″０５２和０．″０４７．这一精度明显优于 Ｃａｓａｓ等人发表的 Ｃａｌｌｉｓｔｏ的处理精度。CCD images for two Galilean satellites: Europa, Callisto and a bright star in Hipparcos Catalogue (No.104297) are obtained on 1 meter telescope at the Yunnan Observatory on the night of Nov.14, 1997. After the two satellites were measured for the scale and orientation of CCD frames, the apparent positions for the star were determined with respect to Callisto. The theoretical positions for Europa and Callisto were calculated from JPL DE405 and Sampson-Lieske theory (G5). The mean differences for the star in R.A. and Dec. between observed apparent positions and calculated ones from Hipparcos Catalogue are -0.″029 + 0.″012 and -0.″005 + 0.″011, respectively (at the mean epoch: 1997 Nov.14, 13h43m50s(UT)). The result is in a good agreement with that from Casas et al. Furthermore, it also means a good agreement between the dynamical reference system from DE405 and the optical one from the Hipparcos Catalogue at the observational epoch. Our standard errors for a single observation are 0.″052 and 0.″047 in R.A. and Dec., respectively. These are as good as the most accurate observation for Galilean satellite.

关 键 词：天然卫星 位置测量 参考系 依巴谷星 伽利略卫星 CCD观测 国际天球参考系 

分 类 号：P125[天文地球—天体测量]