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Phase reddening on asteroid Bennu from visible and near-infrared spectroscopy by Fornasier, S.; Hasselmann, P. H.; Deshapriya, J. D. P; Barucci, M. A.; Clark, B. E.; Praet, A.; Hamilton, V. E.; Simon, A.; Li, J-Y.; Cloutis, E. A.; Merlin, F.; Zou, X-D.; Lauretta, D. S. is a scholarly article available to read on EtoBox.

What is Phase reddening on asteroid Bennu from visible and near-infrared spectroscopy about?

The NASA mission OSIRIS-REx has been observing near-Earth asteroid (101955) Bennu in close proximity since December 2018. In this work, we investigate spectral phase reddening -- that is, the variation of spectral slope with phase angle -- on Bennu using spectra acquired by the OSIRIS-REx Visible and InfraRed Spectrometer (OVIRS) covering a phase angle range of 8-130$^{o}$. We investigate this process at the global scale and for some localized regions of interest (ROIs), including boulders, craters, and the designated sample collection sites of the OSIRIS-REx mission. Bennu has a globally negative spectra slope, which is typical of B-type asteroids. The spectral slope gently increases in a linear way up to a phase angle of 90$^{\circ}$, where it approaches zero. The spectral phase reddening is monotonic and wavelength-dependent with highest values in the visible range. Its coefficient is 0.00044 $\mu$m$^{-1} ~deg^{-1}$ in the 0.55-2.5 $\mu$m range. For observations of Bennu acquired at high phase angle (130$^{\circ}$), phase reddening increases exponentially. Similar behavior was reported in the literature for the carbonaceous chondrite Mukundpura in spectra acquired at extreme geo

Author

Fornasier, S.; Hasselmann, P. H.; Deshapriya, J. D. P; Barucci, M. A.; Clark, B. E.; Praet, A.; Hamilton, V. E.; Simon, A.; Li, J-Y.; Cloutis, E. A.; Merlin, F.; Zou, X-D.; Lauretta, D. S.

Published

2020

Language

EN