CCD astrometric observations of 2017 VR12, Camillo and Midas
CCD astrometric observations of 2017 VR12, Camillo and Midas
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2017 VR12、Camillo 和 Midas 的 CCD 天体测量观测
DOI：
10.1088/1674-4527/19/5/71
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发表时间：
2018-11
影响因子：
1.8
通讯作者：
苏婕
中科院分区：
文献类型：
--
作者：
张桢君;张益恭;程向明;王建成;苏婕
我们在2018年期间观测到了三个近地天体，2017 VR 12，Camillo和Midas。这些观测是用云南天文台的1米望远镜进行的，历时两晚。它们的精确天体测量位置是由989个CCD观测数据导出的。小行星的理论位置是从喷气推进实验室的地平线系统和天体力学和天体计算研究所检索出来的。三颗小行星的位置是相对于盖亚DR 2星星目录中的恒星测量的。对于2017 VR 12，基于JPL公布的星历，赤Ascension和赤经的平均值（O-C）分别为-0.090 ″和-0.623 ″，但基于IMCCE公布的星历，相应的平均值（O-C）为3.122 ″和-0.636 ″。下降的巨大差异可以由几个因素解释。(1)物体快速视运动引起的CCD图像退化，导致定位精度降低。(2)较差的定时系统可能引入系统误差，特别是在高速方向上。(3)当小行星太靠近地球时，它可能会受到地球的扰动。这些天体测量的结果表明，质心中心的方法可以减少非高斯图像的色散相比，PSF建模方法。对于Camillo和Midas，基于两个星历的天体测量结果是一致的。实现高精度的定时系统，并分析一些天文效应和几何失真的CCD图像应仔细考虑在未来的工作。
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 Mécanique Céleste et de Calcul des Éphémérides (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 correspondingmeans (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.
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发表时间：
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