High-albedo c-complex asteroids in the outer main belt: The near-infrared spectra

Toshihiro Kasuga, Fumihiko Usui, Takafumi Ootsubo, Sunao Hasegawa, Daisuke Kuroda

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number1
JournalAstronomical Journal
Volume146
Issue number1
DOIs
Publication statusPublished - 2013 Jul 1

Keywords

  • infrared: planetary systems
  • minor planets, asteroids: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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