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The Ginger-shaped Asteroid 4179 Toutatis: New Observations from a Successful Flyby of Chang'e-2

机译:姜形的小行星4179 Toutatis:嫦娥二号成功飞行的新观察

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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.
机译:2012年12月13日,长安2在距离小行星表面的最近距离770±120米处的最近距离的近地球小行星4179 Toutatis成功。最高分辨率的图像,具有比3米更好的分辨率,揭示了小行星的新发现,例如,在大端的巨大盆地,围绕颈部区域的急剧垂直剪影,以及巨石和巨石的直接证据,这建议Toutatis可以承受瓦砾桩结构。 Toutatis'最大物理长度和宽度分别是(4.75×1.95 km)±10%,+ Z轴的方向估计为J2000 Ecliptic的(250±5°,63±5°)坐标系。分叉的配置表示Toutatis的接触二进制来源,其由两个裂片(头部和主体)组成。长安2观察结果显着改善了我们对一般小行星的特征,形成和演化的理解。

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