利用陨石光谱测试 Bus-DeMeo 小行星分类法

IF 3.8 Q2 ASTRONOMY & ASTROPHYSICS The Planetary Science Journal Pub Date : 2024-09-03 DOI:10.3847/psj/ad57b6
Thomas H. Burbine, Iman Khanani, Deepika Kumawat, Ahlay Hussain, Sydney M. Wallace, M. Darby Dyar
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引用次数: 0

摘要

最广泛使用的小行星光谱分类方法是 Bus-DeMeo 分类法。为了测试 Bus-DeMeo 分类法根据矿物学对小行星进行分类的效果,我们使用 Bus-DeMeo 系统对 1500 ∼ 1500 颗陨石的光谱进行了分类。有些小行星类别能比其他类别更好地将成分相似的陨石组合在一起。霍华德石、白云石和透辉石的光谱倾向于被归类为 V 型,而普通的软玉光谱则倾向于被归类为 S 复合型或 Q 型体。相对无特征的 D 型和 X 型往往以 CM 碳质软玉为主,但也有相当数量的铁陨石。D 类和 X 类中与 CM 类软玉体匹配的比例较大,这很可能是由于我们的数据集中有大量 CM 类软玉体的光谱,而较脆弱的碳质软玉体的光谱则很少。一些相对无特征的小行星类别,如 C-类、B-类、L-类和 Xc-类,将各种矿物学和热历史的陨石类型组合在一起。目视反照率对于区分其中许多组合至关重要。Bus-DeMeo 分类法在对没有红色倾斜光谱的橄榄石为主的陨石进行分类时确实会遇到困难,因为这种类型的光谱在小行星中很少见。对于许多小行星类别,在仅根据光谱类型进行矿物学解释时必须小心谨慎。
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Testing the Bus–DeMeo Asteroid Taxonomy Using Meteorite Spectra
The most widely used method to spectrally classify asteroids is the Bus–DeMeo taxonomy. To test how well the Bus–DeMeo taxonomy groups asteroids on the basis of their mineralogy, we have classified ∼1500 meteorite spectra using this Bus–DeMeo system. Some asteroid classes group together meteorites with similar compositions better than others. Howardite, eucrite, and diogenite spectra tend to be classified as V-types, while ordinary chondrite spectra tend to be classified as S-complex or Q-type bodies. The relatively featureless D- and X-types tend to be dominated by CM carbonaceous chondrites but with a substantial number of matches also with iron meteorites. The large proportion of CM chondrite matches for the D- and X-classes is most likely due to the large number of CM chondrite spectra and the rarity of spectra of more fragile carbonaceous chondrites in our data set. A number of relatively featureless asteroid classes like the C-, B-, L-, and Xc-types group meteorite types together with a wide variety of mineralogies and thermal histories. Visual albedos are vital for distinguishing between many of these assemblages. The Bus–DeMeo taxonomy does have trouble classifying olivine-dominated meteorites that do not have red-sloped spectra because this type of spectrum is rare among asteroids. For many asteroid classes, care must be used when making mineralogical interpretations based solely on spectral type.
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来源期刊
The Planetary Science Journal
The Planetary Science Journal Earth and Planetary Sciences-Geophysics
CiteScore
5.20
自引率
0.00%
发文量
249
审稿时长
15 weeks
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