SIMBAD references

2013AJ....146....1K - Astron. J., 146, 1 (2013/July-0)

High-albedo C-complex asteroids in the outer main belt: the near-infrared spectra.

KASUGA T., USUI F., OOTSUBO T., HASEGAWA S. and KURODA D.

Abstract (from CDS):

Primitive, outer-belt asteroids are generally of low albedo, reflecting carbonaceous compositions like those of CI and CM meteorites. However, a few outer-belt asteroids having high albedos are known, suggesting the presence of unusually reflective surface minerals or, conceivably, even exposed water ice. Here, we present near-infrared (1.1-2.5 µm) spectra of four outer-belt C-complex asteroids with albedos ≥ 0.1. We find no absorption features characteristic of water ice (near 1.5 and 2.0 µm) in the objects. Intimate mixture models set limits to the water ice by weight ≤ 2%. Asteroids (723) Hammonia and (936) Kunigunde are featureless and have (60%-95%) amorphous Mg pyroxenes that might explain the high albedos. Asteroid (1276) Ucclia also shows a featureless reflection spectrum with (50%-60%) amorphous Mg pyroxenes. Asteroid (1576) Fabiola shows a possible weak, broad absorption band (1.5-2.1 µm). The feature can be reproduced by (80%) amorphous Mg pyroxenes or orthopyroxene (crystalline silicate), either of which is likely to cause its high albedo. We discuss the origin of high-albedo components in primitive asteroids.

Abstract Copyright:

Journal keyword(s): infrared: planetary systems - minor planets, asteroids: general

Simbad objects: 4

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2023.02.04-00:20:09

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