嫦娥二号飞越图塔蒂斯成像策略及预期成像结果研究  

A Research on Imaging Strategy and Imaging Simulation of Toutatis in the Chang'e 2 Flyby Mission

作　　者：赵玉晖[1,2] 王素[1,2] 胡寿村[1,2] 季江徽[1,2] 

机构地区：[1]中国科学院紫金山天文台,南京210008 [2]中国科学院行星科学重点实验室,南京210008

出　　处：《天文学报》2013年第5期447-454,共8页Acta Astronomica Sinica

基　　金：国家自然科学基金项目(11273068;11203087);中国科学院新兴与交叉学科布局试点项目(KJZD-EW-Z001);紫金山天文台小行星基金会资助

摘　　要：针对嫦娥二号小行星再拓展试验任务,根据嫦娥二号探测器以及图塔蒂斯小行星轨道参数和太阳光线入射方向计算拍照时的光照条件,基于计算结果建议采用飞越后拍照的策略,并在J2000.0地球平赤道坐标系中给出相机光轴的指向为(118.02°,22.03°).基于国外雷达数据确定的图塔蒂斯形状模型,计算了交会时刻小行星在惯性空间中的指向.利用Oren-Nayar漫反射模型与太阳、小行星和探测器之间的相对位置,采用建议的相机指向,在星空背景下分别对飞越后探测器距离小行星300 km、500 km和1 000 km时刻的成像情况进行了仿真.仿真结果为任务中获得的图塔蒂斯光学图像所验证.For the flyby mission of Toutatis by the Chang＇e 2 detector, the light condi- tions for imaging are calculated in this paper based on the orbital parameters of both the detector and the asteroid and the viewing angle. On the basis of the result, it＇s suggested to take the picture during the out-bound track, and the proposed orientation for the optical axis in the mean equator and equinox of J2000.0 coordinate system is represented to be （118.02°, 22.03°）. Based on the shape model determined by radar data, the Oren-Nayar reflection model is used for imaging simulation according to the position relation among the sun, the asteroid, and the detector. The simulations are done at the distances of 300 km, 500 km, and 1000 km respectively from the asteroid after flyby, and the results are certificated by the optical images obtained in the mission.

关 键 词：行星和卫星 探测 航天器 方法 数值 

分 类 号：P185[天文地球—天文学]