![The surface of asteroid Bennu: dark, rough and dense with boulders Mosaic image of asteroid Bennu](/sites/default/files/styles/crop_square_2_2_to_320px/public/images/news/Figura_Galeria_IAC_Julia.jpg?h=57ae0a72&itok=YIAzvTO3)
Between August and December 2018, during the Approach and Preliminary Survey phases of the NASA OSIRIS-REx mission, a series of images and spectra of the surface of asteroid Bennu, target of the mission, was acquired. Images acquired with MapCam, using 5 different filters provide an average albedo (fraction of the light reflected by the surface of the asteroid) of about 4.5 %, consistent with the spectral type of Bennu as determined from ground-based observations, and in agreement with the results from OSIRIS-REx disk-integrated photometry. Such a dark surface and spectral behaviour are also
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