Precise CCD positions of Phoebe in 2011-2014
Precise CCD positions of Phoebe in 2011-2014
复制标题
2011年至2014年Phoebe的CCD精确位置
DOI：
10.1093/mnras/stv469
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Meng X. H.
中科院分区：
文献类型：
--
作者：
Peng Q. Y. （彭青玉）;Wang N.;Vienne A.;Zhang Q. F.;Li Z.;Meng X. H.
2011-2014年期间的346个新的CCD观测数据已经减少，以获得土星第九颗卫星菲比的精确位置。这些观测是由云南天文台2.4米望远镜进行的，历时9个夜晚。由于在望远镜上使用了缩焦器，它的显著几何失真被解决并消除了每个CCD视场。菲比的位置是相对于UCAC 2星表中的恒星测量的。菲比的理论位置是从Céleste et de Calcul des Éphémedies星历表研究所检索到的，其中包括Desmars等人的最新理论PH 12，而土星的位置是从喷气推进实验室的星历表DE 431中获得的。我们的结果表明，在赤Ascension和赤经上，平均O-Cs（观测值减去计算值）分别为-0.02和-0.07角秒。我们观测的色散估计在每个方向上约为0.04角秒。
346 new CCD observations during the years 2011–2014 have been reduced to derive the precise positions of Phoebe, the ninth satellite of Saturn. The observations were made by the 2.4 m telescope at Yunnan Observatory over nine nights. Due to the use of a focal-reducer on the telescope, its significant geometric distortion is solved for and removed for each CCD field of view. The positions of Phoebe are measured with respect to the stars in UCAC2 catalogue. The theoretical position of Phoebe was retrieved from the Institute de Méchanique Céleste et de Calcul des Éphémérides ephemeris which includes the latest theory PH12 by Desmars et al., while the position of Saturn was obtained from the Jet Propulsion Laboratory ephemeris DE431. Our results show that the mean O−Cs (observed minus computed) are −0.02 and −0.07 arcsec in right ascension and declination, respectively. The dispersions of our observations are estimated at about 0.04 arcsec in each direction.