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Shape modeling is fundamental to the analysis of dynamic environment and motion around asteroid. Chang'E- 2 successfully made a flyby of Asteroid 4179 Toutatis and obtained plenty of high-resolution images during the mis- sion. In this paper, the modeling method and preliminary model of Asteroid Toutatis are discussed. First, the optical images obtained by Chang'E-2 are analyzed. Terrain and silhouette features in images are described. Then, the modeling method based on previous radar model and preliminary information from optical images is proposed. A preliminary polyhedron model of Asteroid Toutatis is established. Finally, the spherical harmonic coefficients of Asteroid Toutatis based on the polyhedron model are obtained. Some parameters of model are analyzed and compared. Although the model proposed in this paper is only a preliminary model, this work offers a valuable reference for future high-resolution models. 相似文献
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数学通报《数学问题解答》专栏经常提出一些颇有兴趣的数学问题,刊载一些独到的解题技巧不仅对中学师生帮助很大,对我们也有很大的参考价值.几十年来数学通报保留了这一特色栏目,越来越起到了对全国的初等数学教学促进和指导的作用.最近看到2006年第6期上《一个“数学问题”的简解》一文,为了把《数学问题解答》这个栏目办得更具特色,想提一个建议: 相似文献
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分别采用因子分析模型和聚类模型对化学电源的技术指标:正极长度、负极长度、隔膜长度、电液量、容量、开路电压、自放电后电压、内阻和重量进行分析,得出正极长度与负极长度参数设计指标联系最紧密,开路电压与自放电后电压性能测试指标联系最紧密.这为化学电源技术指标的分类研究提供理论依据,为化学电源的设计质量控制、组合管理质量控制提供了参考价值,从而促进化学电源的技术进步与发展. 相似文献