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首页> 外文期刊>Icarus: International Journal of Solar System Studies >Photometric analysis of Asteroid (21) Lutetia from Rosetta-OSIRIS images
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Photometric analysis of Asteroid (21) Lutetia from Rosetta-OSIRIS images

机译：Rosetta-OSIRIS图像中小行星（21）Lutetia的光度分析

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摘要

We analyzed the photometric properties of Asteroid (21) Lutetia based on images captured by Rosetta during its flyby. We utilized the images recorded in the FI7 filter (lambda = 631.6 nm) of the Wide Angle Camera (WAC) and in the F82 & F22 filters (lambda = 649.2 nm) of the Narrow Angle Camera (NAC) of the OSIRIS imaging system onboard the spacecraft. We present the results of Hapke and Minnaert modeling using disk-integrated and disk-resolved data derived from the surface of the asteroid. At 631.6 nm and 649.2 nm, the geometric albedo of Lutetia is 0.194 +/- 0.002. The Bond albedo is 0.076 +/- 0.002 at 649.2 nm, and 0.079 +/- 0.002 at 631.6 nm. The roughness parameter is 28 I, the opposition surge parameters B-0 and h are 1.79 +/- 0.08 and 0.041 +/- 0.003, respectively, and the asymmetry factor of the phase function is 0.28 +/- 0.01. The single-scattering albedo is 0226 +/- 0.002 at 631.6 and 649.2 nm. The modeled Hapke parameters of Asteroid Lutetia are close to those of typical S-type asteroids. The Minnaert k parameter of Lutetia at opposition (0.526 +/- 0.002) is comparable with other asteroids and comets. Albedo ratio images indicate no significant variation across the surface of Lutetia, apart from the so called NPCC region on Lutetia where a pronounced variation is seen at large phase angle. The small width of the albedo distribution of the surface (similar to 7% at half maximum) and the similarity between phase ratio maps derived from the measurements and from the modeling suggests that the light scattering property over the whole visible and illuminated surface of the asteroid is widely uniform. The comparison between the reflectance measurement of Lutetia and the available laboratory samples suggests that the regolith on Lutetia is concrete with possible grain size distribution of150 mu m or larger. (C) 2015 Elsevier Inc. All rights reserved.
机译：我们根据罗塞塔（Rosetta）在飞越期间捕获的图像分析了小行星（21）Lutetia的光度特性。我们利用车载OSIRIS成像系统的广角相机（WAC）的FI7滤光片（λ= 631.6 nm）和窄角相机（NAC）的F82和F22滤光片（λ= 649.2 nm）中记录的图像飞船。我们介绍了Hapke和Minnaert建模的结果，使用了来自小行星表面的磁盘集成数据和磁盘解析数据。 Lutetia在631.6 nm和649.2 nm处的几何反照率是0.194 +/- 0.002。邦德反射率在649.2 nm处为0.076 +/- 0.002，在631.6 nm处为0.079 +/- 0.002。粗糙度参数为28 I，相对电涌参数B-0和h分别为1.79 +/- 0.08和0.041 +/- 0.003，相位函数的不对称因子为0.28 +/- 0.01。单散射反射率在631.6和649.2 nm处为0226 +/- 0.002。小行星Lutetia的Hapke模型参数与典型的S型小行星的参数接近。对立的Lutetia的Minnaert k参数（0.526 +/- 0.002）与其他小行星和彗星相当。反照率比率图像表明，除了在Lutetia上的所谓NPCC区域（在大相位角处观察到明显的变化）以外，整个Lutetia的表面没有明显变化。表面的反照率分布的宽度很小（近似等于最大值的7％），并且通过测量和建模得出的相比图之间的相似性表明，在整个小行星可见和照明表面上的光散射特性广泛统一。 Lutetia的反射率测量值与可用的实验室样品之间的比较表明，Lutetia上的灰泥是混凝土，可能的粒度分布为150微米或更大。 （C）2015 Elsevier Inc.保留所有权利。

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