The ginger-shaped asteroid 4179 Toutatis: new observations from a successful flyby of Chang'e-2.

The ginger-shaped asteroid 4179 Toutatis: new observations from a successful flyby of Chang'e-2.
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DOI:
10.1038/srep03411
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发表时间:
2013-12-12
期刊:
影响因子:
4.6
通讯作者:
Bai, Jinming
Bai, Jinming
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Huang, Jiangchuan;Ji, Jianghui;Ye, Peijian;Wang, Xiaolei;Yan, Jun;Meng, Linzhi;Wang, Su;Li, Chunlai;Li, Yuan;Qiao, Dong;Zhao, Wei;Zhao, Yuhui;Zhang, Tingxin;Liu, Peng;Jiang, Yun;Rao, Wei;Li, Sheng;Huang, Changning;Ip, Wing-Huen;Hu, Shoucun;Zhu, Menghua;Yu, Liangliang;Zou, Yongliao;Tang, Xianglong;Li, Jianyang;Zhao, Haibin;Huang, Hao;Jiang, Xiaojun;Bai, Jinming

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2012年12月13日,嫦娥二号成功飞越近地小行星4179 Toutatis,距离小行星表面最近距离为770 ± 120米。分辨率最高的图像,分辨率超过3米,揭示了小行星上的新发现,例如,一个巨大的盆地在大端,一个尖锐的垂直轮廓附近的颈部地区,和巨石和风化层的直接证据,这表明,Toutatis可能承担碎石堆结构。Toutatis的最大物理长度和宽度分别为(4.75 × 1.95 km)± 10%,+z轴方向估计为(250 ± 5°,63 ± 5°)相对于J2000黄道坐标系。 分叉配置表明Toutatis的接触二元起源,由两个叶(头部和身体)组成。嫦娥二号的观测大大提高了我们对小行星的特征、形成和演化的认识。
On 13 December 2012, Chang'e-2 conducted a successful flyby of the near-Earth asteroid 4179 Toutatis at a closest distance of 770 ± 120 meters from the asteroid's surface. The highest-resolution image, with a resolution of better than 3 meters, reveals new discoveries on the asteroid, e.g., a giant basin at the big end, a sharply perpendicular silhouette near the neck region, and direct evidence of boulders and regolith, which suggests that Toutatis may bear a rubble-pile structure. Toutatis' maximum physical length and width are (4.75 × 1.95 km) ±10%, respectively, and the direction of the +z axis is estimated to be (250 ± 5°, 63 ± 5°) with respect to the J2000 ecliptic coordinate system. The bifurcated configuration is indicative of a contact binary origin for Toutatis, which is composed of two lobes (head and body). Chang'e-2 observations have significantly improved our understanding of the characteristics, formation, and evolution of asteroids in general.
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