SPIN STATE AND MOMENT OF INERTIA CHARACTERIZATION OF 4179 TOUTATIS
SPIN STATE AND MOMENT OF INERTIA CHARACTERIZATION OF 4179 TOUTATIS
复制标题
DOI：
10.1088/0004-6256/146/4/95
复制
发表时间：
2013-10-01
影响因子：
5.3
通讯作者：
Scheeres, D. J.
中科院分区：
文献类型：
--
作者：
Takahashi, Yu;Busch, Michael W.;Scheeres, D. J.
4.5公里长的近地小行星4179 Toutatis在1992年至2012年期间大约每四年进行一次近距离飞越地球，并在每次接近期间都通过高分辨率雷达成像进行观测。它最近一次飞越地球是在2012年12月，在戈德斯通和甚大阵列雷达望远镜上进行了广泛的观测。在本文中，Toutatis的自旋状态动力学估计从1992年至2008年之间的五次飞越的观测。观测结果被用来拟合Toutatis的自旋状态动力学在最小二乘意义上，与太阳和地球的潮汐力矩纳入动力学模型。估计的参数是Toutatis的欧拉角，角速度，惯性矩，和质心-图心偏移。自旋状态动力学以及收敛解的欧拉角和角速度的不确定性，然后传播到2012年12月，以比较动力学模型与最近的Toutatis观测。如果观测足够准确，相同的旋转动力学估计技术可以应用于任何其他翻滚物体。
The 4.5 km long near-Earth asteroid 4179 Toutatis has made close Earth flybys approximately every four years between 1992 and 2012, and has been observed with high-resolution radar imaging during each approach. Its most recent Earth flyby in 2012 December was observed extensively at the Goldstone and Very Large Array radar telescopes. In this paper, Toutatis' spin state dynamics are estimated from observations of five flybys between 1992 and 2008. Observations were used to fit Toutatis' spin state dynamics in a least-squares sense, with the solar and terrestrial tidal torques incorporated in the dynamical model. The estimated parameters are Toutatis' Euler angles, angular velocity, moments of inertia, and the center-of-mass-center-of-figure offset. The spin state dynamics as well as the uncertainties of the Euler angles and angular velocity of the converged solution are then propagated to 2012 December in order to compare the dynamical model to the most recent Toutatis observations. The same technique of rotational dynamics estimation can be applied to any other tumbling body, given sufficiently accurate observations.