Precise CCD positions of Apophis in 2013

Precise CCD positions of Apophis in 2013
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2013年Apophis的CCD精确位置

DOI:
10.1093/mnras/stv2236
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发表时间:
2015-12
影响因子:
4.8
通讯作者:
X. H. Meng
X. H. Meng
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
N. Wang;Q. Y. Peng;X. L. Zhang;Q. F. Zhang;Z. Li;X. H. Meng

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2013年减少了298次电荷耦合观测,以得出近地小行星(99942)阿波菲斯的准确位置。这些观测是由云南天文台2.4米望远镜进行的,历时10个晚上。利用Farnocchia等人提供的最新校正表,对USNO-CCD4星表中参考星的位置和自行误差进行了改正。视场的几何失真也是由UCAC4中的无偏恒星位置导出并去除的。阿波菲斯的理论位置是从喷气推进实验室地平线系统中恢复的。结果表明,赤经和赤纬的平均O-Cs(观测值减去计算值)分别为0.016和0.034角秒。我们的观测结果在赤经和赤纬方向的色散估计分别为0.041和0.045角秒。
298 CCD observations during the year 2013 have been reduced to derive the precise positions of near-Earth asteroid (99942) Apophis. The observations were made by the 2.4-m telescope at Yunnan Observatory over 10 nights. The position and proper motion errors of the reference stars in the USNO CCD Astrograph Catalogue 4 (UCAC4) star catalogue are corrected by using the newest correction table provided by Farnocchia et al. The geometric distortion of the field of view is also derived from the unbiased star positions in UCAC4 and removed. The theoretical position of Apophis was retrieved from the Jet Propulsion Laboratory Horizons system. Our results show that the mean O-Cs (observed minus computed) are 0.016 and 0.034 arcsec in right ascension and declination, respectively. The dispersions of our observations are estimated at 0.041 and 0.045 arcsec in right ascension and declination, respectively.
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发表时间: 2015
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