INTERPRETATION OF (596) SCHEILA'S TRIPLE DUST TAILS

INTERPRETATION OF (596) SCHEILA'S TRIPLE DUST TAILS
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DOI:
10.1088/2041-8205/741/1/l24
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发表时间:
2011-10
期刊:
The Astrophysical Journal Letters
影响因子:
--
通讯作者:
M. Ishiguro;H. Hanayama;S. Hasegawa;Y. Sarugaku;J. Watanabe;H. Fujiwara;H. Terada;H. Hsieh;J. Vaubaillon;N. Kawai;K. Yanagisawa;D. Kuroda;T. Miyaji;H. Fukushima;K. Ohta;H. Hamanowa;Junhan Kim;J. Pyo;A. Nakamura
M. Ishiguro;H. Hanayama;S. Hasegawa;Y. Sarugaku;J. Watanabe;H. Fujiwara;H. Terada;H. Hsieh;J. Vaubaillon;N. Kawai;K. Yanagisawa;D. Kuroda;T. Miyaji;H. Fukushima;K. Ohta;H. Hamanowa;Junhan Kim;J. Pyo;A. Nakamura
中科院分区:
其他
文献类型:
--
作者:
M. Ishiguro;H. Hanayama;S. Hasegawa;Y. Sarugaku;J. Watanabe;H. Fujiwara;H. Terada;H. Hsieh;J. Vaubaillon;N. Kawai;K. Yanagisawa;D. Kuroda;T. Miyaji;H. Fukushima;K. Ohta;H. Hamanowa;Junhan Kim;J. Pyo;A. Nakamura

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2010年12月11.44-11.47日,小行星(596)Scheila周围发现了一团奇怪的尘埃云。与普通彗星的彗尾不同,它由三条彗尾组成,并在两个月内消失。基于高速撞击和尘埃动力学的实验室测量,我们构建了一个模型来重现尘埃云的形态。结果,我们成功地再现了奇特的尘埃云,通过撞击驱动的喷出羽流由一个撞击锥和向下的羽流组成。假设撞击角度为45°,我们的模型表明,2010年12月3日,在J2000坐标系中,一颗十米大小的小行星从(αim, δim) =(60°,- 40°)的方向与(596)Scheila相撞。尘埃粒子的最大喷射速度超过100 m s−1。我们的结果表明(596)Scheila的表面是由低抗拉强度的材料组成的。
Strange-looking dust cloud around asteroid (596) Scheila was discovered on 2010 December 11.44–11.47. Unlike normal cometary tails, it consisted of three tails and faded within two months. We constructed a model to reproduce the morphology of the dust cloud based on the laboratory measurement of high-velocity impacts and the dust dynamics. As a result, we succeeded in reproducing the peculiar dust cloud by an impact-driven ejecta plume consisting of an impact cone and downrange plume. Assuming an impact angle of 45°, our model suggests that a decameter-sized asteroid collided with (596) Scheila from the direction of (αim, δim) = (60°, −40°) in J2000 coordinates on 2010 December 3. The maximum ejection velocity of the dust particles exceeded 100 m s−1. Our results suggest that the surface of (596) Scheila consists of materials with low tensile strength.