Physical Characteristics of Near-Earth Asteroids from Thermal Infrared Spectrophotometry☆
Physical Characteristics of Near-Earth Asteroids from Thermal Infrared Spectrophotometry☆
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热红外分光光度法研究近地小行星的物理特征☆
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
J. Davies
中科院分区：
文献类型：
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作者：
A. Harris;J. Davies
介绍了近地小行星 433 Eros、1980 Tezcatlipoca 和 3671 Dionysus 的热红外分光光度观测结果及其对讨论的物体物理特性的影响。尺寸和反照率是根据已发表的热模型以及红外数据与光学观测数据的比较得出的。 433 Eros 的结果与雷达和其他早期发现非常一致，并证明了所使用的热模型之一可实现的准确性。新数据与文献中的早期结果一起表明，433 Eros 的表面热惯性不大于月球的三倍。 1980 Tezcatlipoca 的有效直径和光学反照率（在光曲线最大值附近）为 D=6.7±1.0 km 和 pV=0.15±0.05，3671 Dionysus 的有效直径和光学反照率为 D=1.0±0.2 km 和 pV=0.40±0.15。这些直径与之前的估计显着不同。特斯卡特利波卡和狄俄尼索斯的热连续体表明其表面热惯性较高。狄俄尼索斯的近红外光谱加上高反照率，表明其属于 M 或 E 级。这种分类类型在近地小行星中相对罕见。
Thermal infrared spectrophotometric observations of the near-Earth asteroids 433 Eros, 1980 Tezcatlipoca, and 3671 Dionysus are presented and their implications for the physical characteristics of the objects discussed. Sizes and albedos are derived on the basis of published thermal models and comparison of the infrared data with optical observations. The results for 433 Eros are in very good agreement with radar and other earlier findings and demonstrate the accuracy achievable with one of the thermal models used. The new data, together with earlier results from the literature, suggest the surface thermal inertia of 433 Eros is no larger than three times that of the Moon. The derived effective diameter and optical albedo of 1980 Tezcatlipoca (around lightcurve maximum) are D=6.7±1.0 km and pV=0.15±0.05, and for 3671 Dionysus D=1.0±0.2 km and pV=0.40±0.15. These diameters are significantly different from previous estimates. The thermal continua of Tezcatlipoca and Dionysus are indicative of high surface thermal inertias. A near-infrared spectrum of Dionysus, coupled with the high albedo, suggests an M or E classification. Such taxonomic types are relatively rare amongst near-Earth asteroids.