论文标题
（486958）从出色的掩星中的尺寸和形状约束
Size and Shape Constraints of (486958) Arrokoth from Stellar Occultations
论文作者
论文摘要
我们通过（486958）Arrokoth（New Horizons扩展任务的Flyby目标）介绍了四个恒星宣传的结果。四个努力中的三个导致了身体的积极检测，所有努力都限制了环和其他碎屑的存在，没有发现。 2017年6月3日部署了25个移动站，并通过固定望远镜进行了增强。这项工作没有积极的探测。索非亚观察到了2017年7月10日的活动。 2017年7月17日，二十四个部署的电台产生了五个和弦，显然显示出复杂的形状与触点二进制一致，整体轮廓的粗糙尺寸为20 x 30 km。从这些数据中得出了10％的可见反照率。在2018年8月4日的第四次活动中部署了22个系统，并产生了两个和弦。掩盖数据和Flyby结果的组合提供了旋转期的显着改进，现在估计为15.9380 $ \ pm $ 0.0005小时。掩盖数据还提供了对物体位置的高精度星体约束，这对于支持新视野飞行的导航至关重要。这项工作展示了一种有效的方法，可以获得详细的尺寸和形状信息，并探测远处的Kuiper带对象上的环和灰尘，并且是一个重要的位置数据来源，可以帮助航天器导航，这对于小型和遥远的物体特别有用。
We present the results from four stellar occultations by (486958) Arrokoth, the flyby target of the New Horizons extended mission. Three of the four efforts led to positive detections of the body, and all constrained the presence of rings and other debris, finding none. Twenty-five mobile stations were deployed for 2017 June 3 and augmented by fixed telescopes. There were no positive detections from this effort. The event on 2017 July 10 was observed by SOFIA with one very short chord. Twenty-four deployed stations on 2017 July 17 resulted in five chords that clearly showed a complicated shape consistent with a contact binary with rough dimensions of 20 by 30 km for the overall outline. A visible albedo of 10% was derived from these data. Twenty-two systems were deployed for the fourth event on 2018 Aug 4 and resulted in two chords. The combination of the occultation data and the flyby results provides a significant refinement of the rotation period, now estimated to be 15.9380 $\pm$ 0.0005 hours. The occultation data also provided high-precision astrometric constraints on the position of the object that were crucial for supporting the navigation for the New Horizons flyby. This work demonstrates an effective method for obtaining detailed size and shape information and probing for rings and dust on distant Kuiper Belt objects as well as being an important source of positional data that can aid in spacecraft navigation that is particularly useful for small and distant bodies.
