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arXiv 1604.06129astro-ph.EP
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LORRI新视野观测冥王星和冥卫一的全球反照率

Global Albedos of Pluto and Charon from LORRI New Horizons Observations

B. J. Buratti, J. D. Hofgartner, M. D. Hicks, H. A. Weaver, S. A. Stern, T. Momary, J. A. Mosher, R. A. Beyer, A. J. Verbiscer, A. M. Zangari, L. A. Young, C. M… 展开作者

B. J. Buratti, J. D. Hofgartner, M. D. Hicks, H. A. Weaver, S. A. Stern, T. Momary, J. A. Mosher, R. A. Beyer, A. J. Verbiscer, A. M. Zangari, L. A. Young, C. M. Lisse, K. Singer, A. Cheng, W. Grundy, K. Ennico, C. B. Olkin

摘要:

“新视野号”航天器对冥王星-冥卫一系统的探索首次提供了了解太阳系“第三区”遥远富冰天体中天体表面的日冕分布和其他光度特性的机会。由长距离侦察成像仪(LORRI)相机获得的冥王星和冥卫一整个被照亮的表面的图像提供了冥王星的全球地图,揭示了除了土星的卫星土卫八之外,比任何其他太阳系世界都要大的表面暗斑。冥王星的正常反射率范围为0.08-1.0,冥王星的低反射率区域比冥卫一的任何区域都要暗。冥卫一的表面更为平坦,法向反射率在0.20-0.73之间。冥王星的低丰度特征与地质特征有很好的相关性,尽管一些外生的低丰度尘埃可能是造成在非正式命名为汤博区的区域以西看到的特征的原因。冥王星和冥卫一的相位图都是在纬度上组织的,除了汤博区,较暗的区域集中在冥王星的赤道和冥卫一的北极。冥王星的相位曲线与海卫一相似,海卫一是海王星的大卫星,被认为是一个被捕获的柯伊伯带天体(KBO),而冥卫一的相位曲线与月球的相位曲线相似。Charon的初步债券收益率为0.25+/-0.03,冥王星为0.72+/-0.07。第一次提出了冥王星和冥卫一的近似的邦德轨道图。我们的工作显示了非常高的Erido(接近统一)和行星活动之间的联系,这一结果表明KBO Eris可能正在活动。

英文摘要:

The exploration of the Pluto-Charon system by the New Horizons spacecraft represents the first opportunity to understand the distribution of albedo and other photometric properties of the surfaces of objects in the Solar System's "Third Zone" of distant ice-rich bodies. Images of the entire illuminated surface of Pluto and Charon obtained by the Long Range Reconnaissance Imager (LORRI) camera provide a global map of Pluto that reveals surface albedo variegations larger than any other Solar System world except for Saturn's moon Iapetus. Normal reflectances on Pluto range from 0.08-1.0, and the low-albedo areas of Pluto are darker than any region of Charon. Charon exhibits a much blander surface with normal reflectances ranging from 0.20-0.73. Pluto's albedo features are well-correlated with geologic features, although some exogenous low-albedo dust may be responsible for features seen to the west of the area informally named Tombaugh Regio. The albedo patterns of both Pluto and Charon are latitudinally organized, with the exception of Tombaugh Regio, with darker regions concentrated at the Pluto's equator and Charon's northern pole The phase curve of Pluto is similar to that of Triton, the large moon of Neptune believed to be a captured Kuiper Belt Object (KBO), while Charon's is similar to that of the Moon. Preliminary Bond albedos are 0.25+/-0.03 for Charon and 0.72+/-0.07 for Pluto. Maps of an approximation to the Bond albedo for both Pluto and Charon are presented for the first time. Our work shows a connection between very high albedo (near unity) and planetary activity, a result that suggests the KBO Eris may be currently active.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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