贝努小行星上的岩石
影像来源与版权:NASA, Goddard Space Flight Center, University of Arizona

说明:在这幅由OSIRIS-REx探测器拍摄的生动特写影像中,大量岩石散落在贝努小行星101955的表面。探测器在距离小行星仅3.4公里的位置拍摄了这张影像(摄于3月28日),影像宽度约50米,右上方浅色岩石的高度为4.8米。贝努小行星可能是一颗由松散砾岩堆成的碎石堆小行星。其本身宽度不到500米,与帝国大厦的高度几乎平齐。自OSIRIS-REx探测器于2018年12月到达贝努小行星以来,一直在持续的探测这颗近地小行星,它计划于2020年7月接触小行星崎岖的表面采集尘埃样本后立即脱离(此程序被称为接触即脱离,仅耗费5秒的时间)并于2023年9月将样本送回地球。公民科学家被邀请来帮助选择样本采集的地点。
翻译:北京天文馆

Boulders on Bennu
Image Credit & Copyright: NASA, Goddard Space Flight Center, University of Arizona

Explanation: An abundance of boulders litters the surface asteroid 101955 Bennu in this dramatic close-up from the OSIRIS-REx spacecraft. Taken on March 28 from a distance of just 3.4 kilometers (2.1 miles) the field of view is about 50 meters across while the light colored boulder at top right is 4.8 meters tall. Likely a loose conglomerate rubble pile asteroid, Bennu itself spans less than 500 meters. That’s about the height of the Empire State Building. Mapping the near Earth asteroid since the spacecraft’s arrival in December of 2018, the OSIRIS-REx mission plans a TAG (Touch-and-Go) maneuver for July 2020 to sample Bennu’s rugged surface, returning the sample to planet Earth in September 2023. Citizen scientists have been invited to help choose the sample collection site.
Astronomy Picture of the Day 05/24/2019