论文标题

Kuiper Belt对象的光度法(486958)New Horizo​​ns的ARROKOTH LORRI

Photometry of Kuiper Belt Object (486958) Arrokoth from New Horizons LORRI

论文作者

Hofgartner, Jason D., Buratti, Bonnie J., Benecchi, Susan D., Beyer, Ross A., Cheng, Andrew, Keane, James T., Lauer, Tod R., Olkin, Catherine B., Parker, Joel W., Singer, Kelsi N., Spencer, John R., Stern, S. Alan, Verbiscer, Anne J., Weaver, Harold A., Geology, New Horizons, Team, Geophysics, Team, New Horizons LORRI

论文摘要

2019年1月1日,新的地平线航天器飞行了古典Kuiper带对象(486958)Arrokoth(临时指定为2014 MU69),这可能是飞船有史以来最原始的对象。分析了ARROKOTH的I/F,并具有光度法函数,该光度法是Lommel-seeliger(Lunar)和Lambert光度计功能的线性组合。 ARROKOTH的几何反照率为P_V = 0.21 _(-0.04)^(+0.05)在550 nm的波长下,在610 nm处〜0.24。 Arrokoth的几何反照率大于中位数,但与冷经典的Kuiper带对象的分布一致,其几何反照率是通过将热模型拟合到辐射测定的情况下确定的。因此,Arrokoth的几何反照率增加了轨道和光谱证据,表明它是冷古典的Kuiper带对象。提出了正常反射率的地图和ARROKOTH的半球反照率。 ARROKOTH表面的正常反射率随位置而变化,范围从610 nm处的〜0.10-0.40范围差异,大约高斯分布。 ARROKOTH的极端黑暗和极端明亮的表面都与地形凹陷相关。 ARROKOTH具有双叶齿状形状,两个裂片具有相似的正常反射率分布:两者均大致为高斯,在610 nm时的峰值约为0.25,范围为〜0.10-0.40,这与两个叶的共同形态和共同进化一致。 ARROKOTH的半球反照率在入射角和位置既有很大变化,平均半球形反照率在610 nm处为0.063 +/- 0.015。 610 nm处的Arrokoth的键反照率为0.062 +/- 0.015。

On January 1st 2019, the New Horizons spacecraft flew by the classical Kuiper belt object (486958) Arrokoth (provisionally designated 2014 MU69), possibly the most primitive object ever explored by a spacecraft. The I/F of Arrokoth is analyzed and fit with a photometric function that is a linear combination of the Lommel-Seeliger (lunar) and Lambert photometric functions. Arrokoth has a geometric albedo of p_V = 0.21_(-0.04)^(+0.05) at a wavelength of 550 nm and ~0.24 at 610 nm. Arrokoth's geometric albedo is greater than the median but consistent with a distribution of cold classical Kuiper belt objects whose geometric albedos were determined by fitting a thermal model to radiometric observations. Thus, Arrokoth's geometric albedo adds to the orbital and spectral evidence that it is a cold classical Kuiper belt object. Maps of the normal reflectance and hemispherical albedo of Arrokoth are presented. The normal reflectance of Arrokoth's surface varies with location, ranging from ~0.10-0.40 at 610 nm with an approximately Gaussian distribution. Both Arrokoth's extrema dark and extrema bright surfaces are correlated to topographic depressions. Arrokoth has a bilobate shape and the two lobes have similar normal reflectance distributions: both are approximately Gaussian, peak at ~0.25 at 610 nm, and range from ~0.10-0.40, which is consistent with co-formation and co-evolution of the two lobes. The hemispherical albedo of Arrokoth varies substantially with both incidence angle and location, the average hemispherical albedo at 610 nm is 0.063 +/- 0.015. The Bond albedo of Arrokoth at 610 nm is 0.062 +/- 0.015.

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