Phase-curve analysis of comet 67P/Churyumov-Gerasimenko at small phase angles
Phase-curve analysis of comet 67P/Churyumov-Gerasimenko at small phase angles
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67P/Churyumov-Gerasimenko 彗星小相位角下的相位曲线分析
DOI：
10.1051/0004-6361/201834845
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发表时间：
2019
影响因子：
6.5
通讯作者：
Masoumzadeh N
中科院分区：
文献类型：
--
作者：
Masoumzadeh N
Rosetta-OSIRIS在2016年4月9日至10日的航天器飞行期间以三个波长的小相位角获取的图像为研究彗星67 P/Churyumov-Gerasimenko（67 P）表面的反对派效应提供了一个独特的机会。我们的目标是研究相位曲线的核在小相位角的各种表面结构，以显示其对立的效果的差异，并确定哪些表面属性导致的differences.MethodsWe使用OSIRIS NAC图像，覆盖的阿什-Khepry-Imhotep区域提取的相位曲线，即，反射率的表面作为相位角的函数。我们选择了六个感兴趣的区域（ROI），并推导出每个ROI的相位曲线。我们拟合一个线性指数函数的相位曲线。由此产生的模型参数，然后解释分光光度计，地貌，和相位比分析，并通过调查的结构和纹理属性的影响surfaces.ResultsWe发现证据的反对效果（从线性行为的相位曲线的偏差）在相位曲线的所有区域。在小相角范围内，相位比与反射率之间存在线性关系。这为阴影隐藏效应提供了证据。我们的结论是，相位比与反射率的斜率的减小表明阴影区域比例的减小，并减少了阴影隐藏效应的贡献。相对于波长的对立效应参数的测定中的大的不确定性不允许我们最终声称对立效应现象中的相干后向散射。根据这两种分析，我们认为67 P彗星在Ash-Khepry-Imhotep区的冲日效应主要受阴影遮蔽的影响。
AimsThe Rosetta-OSIRIS images acquired at small phase angles in three wavelengths during the fly-by of the spacecraft on 9–10 April 2016 provided a unique opportunity to study the opposition effect on the surface of comet 67P/Churyumov-Gerasimenko (67P). Our goal is to study phase curves of the nucleus at small phase angles for a variety of surface structures to show the differences in their opposition effect and to determine which surface properties cause the differences.MethodsWe used OSIRIS NAC images that cover the Ash-Khepry-Imhotep region to extract the phase curve, that is, the reflectance of the surface as a function of phase angle. We selected six regions of interest (ROIs) and derived the phase curves for each ROI. We fit a linear-exponential function to the phase curves. The resulting model parameters were then interpreted by spectrophotometric, geomorphological, and phase-ratio analyses, and by investigating the influence of structural and textural properties of the surface.ResultsWe find evidence for the opposition effect (deviation of the phase curve from linear behavior) in phase curves for all areas. We found an anticorrelation between the phase ratio and reflectance in a small phase angle range. This provides evidence for the shadow-hiding effect. We conclude that the decrease in the slope of the phase ratio versus reflectance indicates a decrease in the proportion of shadowed regions and reduces the contribution of the shadow-hiding effect. Large uncertainties in the determination of the opposition effect parameters with respect to wavelength do not allow us to conclusively claim coherent backscattering in the opposition effect phenomenon. Based on the two analyses, we conclude that the opposition effect of comet 67P in the Ash-Khepry-Imhotep region is mainly affected by shadow-hiding.
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木星家族彗星核的大小分布
DOI：
10.1111/j.1365-2966.2011.18406.x
发表时间：
2003
影响因子：
4.8
作者：
C. Snodgrass;A. Fitzsimmons;S. Lowry;P. Weissman
通讯作者：
P. Weissman
影响因子：
3.2
作者：
Scott, David W.
通讯作者：
Scott, David W.
DOI：
10.1007/978-0-387-77518-0
发表时间：
2009
期刊：
--
影响因子：
--
作者：
R. Schulz;C. Alexander;H. Boehnhardt;K. Glassmeier
通讯作者：
R. Schulz;C. Alexander;H. Boehnhardt;K. Glassmeier
太阳系天体表现出的光度和偏振对立现象
影响因子：
4.8
作者：
V. Rosenbush;N. Kiselev;V. Avramchuk;M. Mishchenko
通讯作者：
M. Mishchenko
Rosetta/OSIRIS 在 2016 年 4 月飞越期间对 67P 核的观测：高分辨率分光光度法
影响因子：
6.5
作者：
C. Feller;S. Fornasier;S. Ferrari;P. Hasselmann;A. Barucci;M. Massironi;J. Deshapriya;H. Sierks;G. Naletto;P. Lamy;R. Rodrigo;R. Rodrigo;D. Koschny;B. Davidsson;J. Bertaux;I. Bertini;D. Bodewits;G. Cremonese;V. Deppo;S. Debei;M. Cecco;M. Fulle;P. J. Guti'errez;C. Güttler;W. Ip;H. Keller;L. Lara;M. Lazzarin;J. Lopez‐Moreno;F. Marzari;Xian Shi;C. Tubiana;B. Gaskell;F. L. Forgia;A. Lucchetti;S. Mottola;M. Pajola;F. Preusker;F. Scholten
通讯作者：
F. Scholten