论文标题
Kuiper Belt对象的光度法(486958)New Horizons的ARROKOTH LORRI
Photometry of Kuiper Belt Object (486958) Arrokoth from New Horizons LORRI
论文作者
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.