One of the most striking and curious features of the small Kuiper Belt Object (KBO), Arrokoth, explored by New Horizons is the bright, annular neck it exhibits at the junction between its two lobes. Here we summarize past reported findings regarding the properties of this feature and then report new results regarding its dimensions, reflectivity and color, shape profile, and lack of identifiable craters. We conclude by enumerating possible origin scenarios for this unusual feature. New results include a new estimated measurement of the observed neck area of 8 1.5 km², a total neck surface area of 32 km², a 12.5:1 ratio of circumference to height, a normal reflectance histogram of the observed neck, and the fact that no significant (i.e., >2σ) neck color units were identified, meaning the neck’s color is generally spatially uniform at the 1.5 km pixel⁻¹ scale of the best color images. Although several origin hypotheses for the bright material in the neck are briefly discussed, none can be conclusively demonstrated to be the actual origin mechanism at this time; some future tests are identified.

New Horizo​​ ns探索的小型柯伊伯带天体（KBO）Arrokoth最引人注目和最奇怪的特征之一是它在两个叶瓣之间的交界处展示的明亮环形颈部。在这里，我们总结了过去关于该特征属性的报告发现，然后报告了有关其尺寸、反射率和颜色、形状轮廓以及缺乏可识别陨石坑的新结果。我们最后列举了这个不寻常特征的可能起源场景。新结果包括对观察到的颈部面积 8 1.5 km ²的新估计测量值、32 km ^{2 的}颈部总表面积、12.5:1 的周长比、观察到的颈部的正常反射率直方图以及事实不显着（即 >2 σ) 颈部颜色单位被识别，这意味着颈部颜色在最佳彩色图像的 1.5 公里像素^-1尺度上通常在空间上是均匀的。尽管对颈部明亮物质的几种起源假说进行了简要讨论，但目前没有一个可以最终证明是实际的起源机制。确定了一些未来的测试。