Astronomy Picture of the Day——贝努小行星上的岩石

Boulders on Bennu
Image Credit: NASA, Goddard Space FlightCenter, University of Arizona
Explanation: An abundance of boulderslitters the surface asteroid 101955 Bennu in this dramatic close-up from theOSIRIS-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 coloredboulder at top right is 4.8 meters tall. Likely a loose conglomerate rubblepile asteroid, Bennu itself spans less than 500 meters. That's about the heightof the Empire State Building. Mapping the near Earth asteroid since thespacecraft'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 havebeen invited to help choose the sample collection site.
贝努小行星上的岩石
在这幅OSIRIS-REx探测器拍摄的特写照片中,大量碎石散落在小行星101955贝努的表面。3月28日,探测器在距离小行星仅3.4公里的地方拍摄了这幅照片,影像覆盖宽度约50米,右上方浅色岩石的高度为4.8米。小行星贝努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持平。自OSIRIS-REx探测器于2018年12月抵达贝努小行星以来,一直持续观测这颗近地小行星,它计划于2020年7月接触小行星崎岖的表面,在采集尘埃样本后立即脱离(此程序被称为接触即脱离,仅耗时5秒),并在2023年9月前将样本送回地球。很多民间科学家被邀请来帮助选择采样地点。
参考文献:
https://apod.nasa.gov/apod/image/1905/pdco-20190328-up-slope-to-limb.jpg
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