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http://hdl.handle.net/20.500.12386/28138
Titolo: | Unusual polarimetric properties of (101955) Bennu: similarities with F-class asteroids and cometary bodies | Autori: | CELLINO, Alberto Bagnulo, S. Belskaya, I. N. Christou, A. A. |
Data pubblicazione: | 2018 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. LETTERS | Numero: | 481 | Fascicolo: | 1 | Da pagina:: | L49 | Abstract: | We have obtained polarimetric measurements of asteroid (101955) Bennu, a presumably primitive near-Earth object (NEO) that is the target of NASA's sample return mission OSIRIS-REx. During our observing campaign, Bennu was visible from Earth under a wide range of illumination conditions, with phase angle in the range 16°-57°. Together with (3200) Phaethon and (152679) 1998 KU2, observed very recently, Bennu is the only existing example of a primitive NEO observed in polarimetric mode over a wide interval of phase angles. Based on our polarimetric data, we propose that Bennu belongs to the unusual F taxonomic class defined in the 80s. According to previous works, the F-class includes objects with cometary features. This fact can be of great importance for the interpretation of the results of the exploration of this object by OSIRIS-REx. From polarimetry we also derive an estimate of the geometric albedo of Bennu: p<SUB>R</SUB> = 0.059 ± 0.003. | URI: | http://hdl.handle.net/20.500.12386/28138 | URL: | https://academic.oup.com/mnrasl/article/481/1/L49/5079642 | ISSN: | 1745-3925 | DOI: | 10.1093/mnrasl/sly156 | Bibcode ADS: | 2018MNRAS.481L..49C | Fulltext: | open |
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