原始相接双星2014 MU69
影像来源与版权:NASA, Johns Hopkins University APL, Southwest Research Institute, Roman Tkachenko

说明:原始相接双星2014 MU69也称为Ultima Thule,它的确呈现出红色。实际上,它是宇宙飞船造访过颜色最红的外太阳系天体。它的红色色泽被认为是由其表面的有机物质所致。这幅合成影像中的红润颜色和引人注目的表面细节是基于新视野号宇宙飞船在1月1日飞越迄今为止探测过的最遥远世界时所记录的数据。较小瓣状结构Thule(位于影像顶部)上的凹陷是宽度为8公里的马里兰环形山,它是已知的、Ultima Thule表面上的最大凹陷。从此次飞越中收集到的数据传输将继续进行,直到2020年夏末,新视野号将进一步深入昏暗而遥远的柯伊伯带。
翻译:北京天文馆

Primordial Contact Binary 2014 MU69
Image Credit & Copyright: NASA, Johns Hopkins University APL, Southwest Research Institute, Roman Tkachenko

Explanation: Primordial contact binary 2014 MU69, also known as Ultima Thule, really is very red. In fact, it’s the reddest outer solar system object ever visited by a spacecraft from Earth. Its reddish hue is believed to be due to organic materials on its surface. Ruddy color and tantalizing surface details seen in this composite image are based on data from the New Horizons spacecraft recorded during the January 1 flyby of the farthest world yet explored. Embedded in the smaller lobe Thule (top), the 8 kilometer wide feature nicknamed Maryland crater is the largest depression known on the surface of Ultima Thule. Transmission of data collected from the flyby continues, and will go on until the late summer 2020 as New Horizons speeds deeper into the dim and distant Kuiper Belt.
Astronomy Picture of the Day 05/22/2019