ALBEDO PROPERTIES OF MAIN BELT ASTEROIDS BASED ON THE ALL-SKY SURVEY OF THE INFRARED ASTRONOMICAL SATELLITE AKARI
ALBEDO PROPERTIES OF MAIN BELT ASTEROIDS BASED ON THE ALL-SKY SURVEY OF THE INFRARED ASTRONOMICAL SATELLITE AKARI
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基于红外天文卫星 AKARI 全天巡天的主带小行星反照率特性
DOI：
10.1088/0004-637x/762/1/56
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
H. Matsuhara
中科院分区：
文献类型：
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作者：
F. Usui;T. Kasuga;S. Hasegawa;M. Ishiguro;D. Kuroda;T. Mueller;T. Ootsubo;H. Matsuhara
本文对红外天文卫星AKARI全天巡天探测到的主带小行星的反照率特性进行了分析。此次调查发现的5120颗小行星的特征，包括它们的大小和反照率，都用AKARI （AcuA）在小行星目录中进行了编目。尺寸和反照率测量基于标准热模型，使用红外通量输入和光学波长测量的绝对星等。5120颗AcuA小行星中，除了近地小行星外，mba的半长轴在2.06-3.27 AU之间，占4722颗。AcuA提供了一个完整的数据集，所有的mba都比绝对星等H < 10.3亮，对应于直径d > 20 km。我们证实了MBAs的反照率分布是强烈的双峰分布，而且这种双峰分布不仅出现在总体上，而且出现在主带的内、中、外区域。每组的双峰分布由c型小行星的低反照率分量和s型小行星的高反照率分量组成。我们发现小型小行星的反照率比大型小行星的反照率变化更大。尽管存在空间风化等反照率转变过程，但各分类类型小行星平均反照率的日心分布几乎是平坦的。总反照率的平均反照率随半长轴的增加而逐渐降低。这可以用分类类型的组成比例来解释；即随着日心距离的增加，C型、d型等暗色小行星的比例增加，s型等明亮小行星的比例减少。根据反照率对x亚类E-型、M-型和p -型的日心分布进行了研究。p型是x型的主要组成部分，分布在主带区域，p型丰度在3au以上增加。这种分布与C型或d型相似。
We present an analysis of the albedo properties of main belt asteroids (MBAs) detected by the All-Sky Survey of the infrared astronomical satellite AKARI. The characteristics of 5120 asteroids detected by the survey, including their sizes and albedos, were cataloged in the Asteroid Catalog Using AKARI (AcuA). Size and albedo measurements were based on the standard thermal model, using inputs of infrared fluxes and absolute magnitudes measured at optical wavelengths. MBAs, which account for 4722 of the 5120 AcuA asteroids, have semimajor axes of 2.06–3.27 AU, except for the near-Earth asteroids. AcuA provides a complete data set of all MBAs brighter than the absolute magnitude of H < 10.3, which corresponds to the diameter of d > 20 km. We confirmed that the albedo distribution of the MBAs is strongly bimodal as was already known from the past observations, and that the bimodal distribution occurs not only in the total population, but also within inner, middle, and outer regions of the main belt. The bimodal distribution in each group consists of low-albedo components in C-type asteroids and high-albedo components in S-type asteroids. We found that the small asteroids have much more variety in albedo than the large asteroids. In spite of the albedo transition process like space weathering, the heliocentric distribution of the mean albedo of asteroids in each taxonomic type is nearly flat. The mean albedo of the total, on the other hand, gradually decreases with an increase in semimajor axis. This can be explained by the compositional ratio of taxonomic types; that is, the proportion of dark asteroids such as C- and D-types increases, while that of bright asteroids such as S-type decreases, with increasing heliocentric distance. The heliocentric distributions of X-subclasses: E-, M-, and P-types, which can be divided based on albedo values, are also examined. P-types, which are the major component in X-types, are distributed throughout the main belt regions, and the abundance of P-types increases beyond 3 AU. This distribution is similar to that of C- or D-types.
影响因子：
2.3
作者：
F. Usui;D. Kuroda;T. Müller;S. Hasegawa;M. Ishiguro;T. Ootsubo;D. Ishihara;H. Kataza;S. Takita;S. Oyabu;M. Ueno;H. Matsuhara;T. Onaka
通讯作者：
F. Usui;D. Kuroda;T. Müller;S. Hasegawa;M. Ishiguro;T. Ootsubo;D. Ishihara;H. Kataza;S. Takita;S. Oyabu;M. Ueno;H. Matsuhara;T. Onaka
AKARI 红外全天巡天
DOI：
--
发表时间：
2010
期刊：
影响因子：
--
作者：
Y.Matsumoto;et al;小宮山進;新関伸也;Yasuo Doi
通讯作者：
Yasuo Doi