Dark asteroids exhibiting intermediate characteristics between C and X types

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ID: 317066
2026
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Abstract
Abstract Large main-belt asteroids with visible geometric albedos below 0.1 are predominantly classified within the C- and X-complex spectroscopic classes. C-type and dark X-type asteroids typically exhibit flat to slightly negative and positive spectral slopes, respectively. They are further distinguished by the presence (for C-types) or absence (for dark X-types) of a shallow absorption feature near 1.0–1.3 μm. We serendipitously discovered that the asteroids 1093 Freda and 1390 Abastumani display spectral characteristics intermediate between these two classes, combining a positive visible-to-near-infrared spectral slope with a shallow absorption band. A search in the literature reveals additional asteroids with similar properties. The existence of such objects, spanning a continuum of spectral shapes between C- and dark X-types, may point to a common genetic origin. Their spectral behavior could be explained by the presence of cronstedtite, an Fe-rich serpentine, on their surfaces.
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Authors Sunao Hasegawa, Chrysa Avdellidou, Michaël Marsset, Ullas Bhat, Marco Delbo, D. Kuroda, M. Matsuoka, Masateru Ishiguro, Cristina A. Thomas, F. E. DeMeo, Pierre Vernazza
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Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1095
URL
https://doi.org/10.1093/mnras/stag1095
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