التفاصيل البيبلوغرافية
| العنوان: |
The M-/X-asteroid menagerie: Results of an NIR spectral survey of 45 main-belt asteroids. |
| المؤلفون: |
HARDERSEN, Paul S., CLOUTIS, Edward A., REDDY, Vishnu, MOTHÉ-DINIZ, Thais, EMERY, Joshua P. |
| المصدر: |
Meteoritics & Planetary Science; Dec2011, Vol. 46 Issue 12, p1910-1938, 29p, 7 Charts, 11 Graphs |
| مصطلحات موضوعية: |
ASTEROIDS, SOLAR system, CHIRON (Asteroid), PYROXENE, SILICATE minerals |
| مستخلص: |
- Diagnostic mineral absorption features for pyroxene(s), olivine, phyllosilicates, and hydroxides have been detected in the near-infrared (NIR: approximately 0.75-2.50 μm) spectra for 60% of the Tholen-classified () M-/X-asteroids observed in this study. Nineteen asteroids (42%) exhibit weak Band I (approximately 0.9 μm) ± Band II (approximately 1.9 μm) absorptions, three asteroids (7%) exhibit a weak Band I (approximately 1.05-1.08 μm) olivine absorption, four asteroids (9%) display multiple absorptions suggesting phyllosilicate ± oxide/hydroxide minerals, one (1) asteroid exhibits an S-asteroid type NIR spectrum, and 18 asteroids (40%) are spectrally featureless in the NIR, but have widely varying slopes. Tholen M-asteroids are defined as asteroids exhibiting featureless visible-wavelength (λ) spectra with moderate albedos (). Tholen X-asteroids are also defined using the same spectral criterion, but without albedo information. Previous work has suggested spectral and mineralogical diversity in the M-asteroid population (; ; ; ; ; ; ; ). The pyroxene-bearing asteroids are dominated by orthopyroxene with several likely to include higher-Ca clinopyroxene components. Potential meteorite analogs include mesosiderites, CB/CH chondrites, and silicate-bearing NiFe meteorites. The Eos family, olivine-bearing asteroids are most consistent with a CO chondrite analog. The aqueously altered asteroids display multiple, weak absorptions (0.85, 0.92, 0.97, 1.10, 1.40, and 2.30-2.50 μm) indicative of phyllosilicate ± hydroxide minerals. The spectrally featureless asteroids range from metal-rich to metal-poor with meteorite analogs including NiFe meteorites, enstatite chondrites, and stony-iron meteorites. [ABSTRACT FROM AUTHOR] |
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