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The Debiased Compos...
The Debiased Compositional Distribution of MITHNEOS: Global Match between the Near-Earth and Main-belt Asteroid Populations, and Excess of D-type Near-Earth Objects
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- Marsset, Michaël (author)
- Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA; European Southern Observatory, Alonso de Córdova 3107, Santiago, Chile
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- DeMeo, Francesca E. (author)
- Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
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- Burt, Brian (author)
- Lowell Observatory, 1400 W. Mars Hill Road, Flagstaff, AZ, 86001, USA
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- Polishook, David (author)
- Faculty of Physics, Weizmann Institute of Science, Israel
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- Binzel, Richard P. (author)
- Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
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- Granvik, Mikael (author)
- Luleå tekniska universitet,Rymdteknik,Department of Physics, University of Helsinki, PO Box 64, FI-00014 Helsinki, Finland
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- Vernazza, Pierre (author)
- Aix Marseille Univ, CNRS, LAM, Laboratoire d’Astrophysique de Marseille, Marseille, France
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- Carry, Benoit (author)
- Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, France
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- Bus, Schelte J. (author)
- Institute for Astronomy, University of Hawaii, 2860 Woodlawn Drive, Honolulu, HI 96822-1839, USA
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- Slivan, Stephen M. (author)
- Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
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- Thomas, Cristina A. (author)
- Department of Astronomy and Planetary Science, Northern Arizona University, PO Box 6010, Flagstaff, AZ 86005, USA
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- Moskovitz, Nicholas A. (author)
- Lowell Observatory, 1400 W. Mars Hill Road, Flagstaff, AZ, 86001, USA
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- Rivkin, Andrew S. (author)
- Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723 USA
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(creator_code:org_t)
- 2022-03-14
- 2022
- English.
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In: Astronomical Journal. - : Institute of Physics (IOP). - 0004-6256 .- 1538-3881. ; 163:4
- Related links:
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https://doi.org/10.3...
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https://urn.kb.se/re...
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Abstract
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- We report 491 new near-infrared spectroscopic measurements of 420 near-Earth objects (NEOs) collected on the NASA InfraRed Telescope Facility as part of the MIT-Hawaii NEO Spectroscopic Survey. These measurements were combined with previously published data from Binzel et al. and bias-corrected to derive the intrinsic compositional distribution of the overall NEO population, as well as of subpopulations coming from various escape routes (ERs) in the asteroid belt and beyond. The resulting distributions reflect well the overall compositional gradient of the asteroid belt, with decreasing fractions of silicate-rich (S- and Q-type) bodies and increasing fractions of carbonaceous (B-, C-, D- and P-type) bodies as a function of increasing ER distance from the Sun. The close compositional match between NEOs and their predicted source populations validates dynamical models used to identify ERs and argues against any strong composition change with size in the asteroid belt between ∼5 km and ∼100 m. A notable exception comes from the overabundance of D-type NEOs from the 5:2J and, to a lesser extend, the 3:1J and ν6 ERs, hinting at the presence of a large population of small D-type asteroids in the main belt. Alternatively, this excess may indicate preferential spectral evolution from D-type surfaces to C and P types as a consequence of space weathering, or point to the fact that D-type objects fragment more often than other spectral types in the NEO space. No further evidence for the existence of collisional families in the main belt, below the detection limit of current main-belt surveys, was found in this work.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- Spectroscopy
- Asteroid surfaces
- Near-Earth objects
- Main belt asteroids
- Onboard space systems
- Rymdtekniska system
Publication and Content Type
- ref (subject category)
- art (subject category)
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Marsset, Michaël
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DeMeo, Francesca ...
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Burt, Brian
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Polishook, David
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Binzel, Richard ...
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Granvik, Mikael
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Vernazza, Pierre
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Carry, Benoit
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Bus, Schelte J.
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Slivan, Stephen ...
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Thomas, Cristina ...
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Moskovitz, Nicho ...
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Rivkin, Andrew S ...
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NATURAL SCIENCES
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Luleå University of Technology