论文摘要
We have observed three near-Earth objects(NEOs), 2017 VR12, Camillo and Midas, during 2018.The observations were made with the 1-m telescope, operated by Yunnan Observatories, over two nights.Their precise astrometric positions are derived from 989 CCD observations. The theoretical positions of asteroids are retrieved from the Jet Propulsion Laboratory(JPL) Horizons System and Institut de M′ecanique C′eleste et de Calcul des ′Eph′em′erides(IMCCE). The positions of three asteroids are measured with respect to stars in the Gaia DR2 star catalog. For 2017 VR12, the means(O-C) of right ascension and declination are -0.090′′and-0.623′′respectively based on the published JPL ephemeris, but the corresponding means(O-C) are 3.122′′and-0.636′′based on the published IMCCE ephemeris. The great difference in declination could be explained by several factors.(1) The degraded CCD images caused by the fast apparent motion of the objects lead to a reduction in positioning accuracy.(2) The poor timing system may introduce systematic errors, especially in the high speed direction.(3) The asteroid may be perturbed by Earth when it approaches the Earth too closely. These astrometric results demonstrate that the centroid centering method can reduce the dispersion of non-Gaussian images as compared with the PSF modeling method.For Camillo and Midas, the astrometric results are consistent based on the two ephemerides. Implementing a high-precision timing system, and analyzing some astronomical effects and geometric distortions in CCD images should be carefully considered in future works.
论文目录
文章来源
类型: 期刊论文
作者: Zhen-Jun Zhang,Yi-Gong Zhang,Xiang-Ming Chen,Jian-Cheng Wang,Jie Su
来源: Research in Astronomy and Astrophysics 2019年05期
年度: 2019
分类: 基础科学
专业: 天文学
单位: Yunnan Observatories, Chinese Academy of Sciences,Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences,University of Chinese Academy of Sciences
基金: financially supported by the National Natural Science Foundation of China (Grant Nos. 11503083 and 11403101)
分类号: P111
页码: 93-102
总页数: 10
文件大小: 915K
下载量: 19
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