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A spectroscopic survey of the small near-Earth asteroid population: Peculiar taxonomic distribution and phase reddening.

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Title: A spectroscopic survey of the small near-Earth asteroid population: Peculiar taxonomic distribution and phase reddening.
Authors: Perna, D.1,2 davide.perna@obspm.fr, Barucci, M.A.2, Fulchignoni, M.2, Popescu, M.2,3, Belskaya, I.2,4, Fornasier, S.2, Doressoundiram, A.2, Lantz, C.2,5, Merlin, F.2
Source: Planetary & Space Science. Aug2018, Vol. 157, p82-95. 14p.
Subjects: Asteroids, Optical spectroscopy, Solar system, European Southern Observatory, Geological surveys, History
Abstract: We present the results of the first-ever visible spectroscopic survey fully dedicated to the small (absolute magnitude H ≥ 20) near-Earth asteroid (NEA) population. Observations have been performed at the New Technology Telescope (NTT) of the European Southern Observatory (ESO), during a 30-night Guaranteed Time Observations programme, in the framework of the European Commission financed NEOShield-2 project. The visible spectra of 147 objects have been obtained and taxonomically classified. They show a peculiar taxonomic distribution, with respect to larger NEAs. In particular, olivine-rich A-types and organic-rich D-types are more abundant than what could be expected by extrapolating the taxonomic distribution of larger NEAs. Such results have implications for the investigation of the first phases of solar system history, including the delivery of prebiotic material on the early Earth. Having been obtained over a large range of solar phase angles, our data allowed us to evidence peculiar phase reddening behaviours for asteroids belonging to different taxonomic types. Low-albedo asteroids display no or limited phase reddening, compared to moderate- and high-albedo objects. This result suggests a promising novel way to distinguish primitive asteroids in the X-complex. In agreement with previous laboratory experiments, olivine-rich surfaces are the most affected by phase reddening. [ABSTRACT FROM AUTHOR]
Copyright of Planetary & Space Science is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: A spectroscopic survey of the small near-Earth asteroid population: Peculiar taxonomic distribution and phase reddening.
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  Data: <searchLink fieldCode="AR" term="%22Perna%2C+D%2E%22">Perna, D.</searchLink><relatesTo>1,2</relatesTo><i> davide.perna@obspm.fr</i><br /><searchLink fieldCode="AR" term="%22Barucci%2C+M%2EA%2E%22">Barucci, M.A.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Fulchignoni%2C+M%2E%22">Fulchignoni, M.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Popescu%2C+M%2E%22">Popescu, M.</searchLink><relatesTo>2,3</relatesTo><br /><searchLink fieldCode="AR" term="%22Belskaya%2C+I%2E%22">Belskaya, I.</searchLink><relatesTo>2,4</relatesTo><br /><searchLink fieldCode="AR" term="%22Fornasier%2C+S%2E%22">Fornasier, S.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Doressoundiram%2C+A%2E%22">Doressoundiram, A.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Lantz%2C+C%2E%22">Lantz, C.</searchLink><relatesTo>2,5</relatesTo><br /><searchLink fieldCode="AR" term="%22Merlin%2C+F%2E%22">Merlin, F.</searchLink><relatesTo>2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Planetary+%26+Space+Science%22">Planetary & Space Science</searchLink>. Aug2018, Vol. 157, p82-95. 14p.
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  Data: <searchLink fieldCode="DE" term="%22Asteroids%22">Asteroids</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+spectroscopy%22">Optical spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Solar+system%22">Solar system</searchLink><br /><searchLink fieldCode="DE" term="%22European+Southern+Observatory%22">European Southern Observatory</searchLink><br /><searchLink fieldCode="DE" term="%22Geological+surveys%22">Geological surveys</searchLink><br /><searchLink fieldCode="DE" term="%22History%22">History</searchLink>
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  Data: We present the results of the first-ever visible spectroscopic survey fully dedicated to the small (absolute magnitude H ≥ 20) near-Earth asteroid (NEA) population. Observations have been performed at the New Technology Telescope (NTT) of the European Southern Observatory (ESO), during a 30-night Guaranteed Time Observations programme, in the framework of the European Commission financed NEOShield-2 project. The visible spectra of 147 objects have been obtained and taxonomically classified. They show a peculiar taxonomic distribution, with respect to larger NEAs. In particular, olivine-rich A-types and organic-rich D-types are more abundant than what could be expected by extrapolating the taxonomic distribution of larger NEAs. Such results have implications for the investigation of the first phases of solar system history, including the delivery of prebiotic material on the early Earth. Having been obtained over a large range of solar phase angles, our data allowed us to evidence peculiar phase reddening behaviours for asteroids belonging to different taxonomic types. Low-albedo asteroids display no or limited phase reddening, compared to moderate- and high-albedo objects. This result suggests a promising novel way to distinguish primitive asteroids in the X-complex. In agreement with previous laboratory experiments, olivine-rich surfaces are the most affected by phase reddening. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Planetary & Space Science is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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              Text: Aug2018
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