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

机译:姜形小行星4179图塔蒂斯号:from娥二号成功掠过的新观察

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摘要

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,Chang娥二号成功越过小行星表面770±120米,成功越过了近地小行星4179 Toutatis。最高分辨率的图像(分辨率高于3米)揭示了在小行星上的新发现,例如,大端的巨大盆地,颈部附近的轮廓明显垂直,以及巨石和长石的直接证据。提示图塔蒂斯犬可能具有瓦砾堆结构。 Toutatis的最大物理长度和宽度分别为(4.75×1.95 km)±10%,并且+ z轴方向相对于J2000黄道坐标估计为(250±5°,63±5°)系统。分叉的配置指示了Toutatis的接触二元起源,它由两个瓣(头部和身体)组成。娥二号的观测结果大大提高了我们对小行星的特征,形成和演化的认识。

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