Diverse Albedos of Small Trans-Neptunian Objects

Details Diverse Albedos of Small Trans-Neptunian Objects Diverse Albedos of Small Trans-Neptunian Objects

2005-02-10

arxiv.org/abs/astro-ph/0502229v1

Astronomy and Astrophysics

Astrophysics

27 manuscript pages including 1 figure

Scientific paper

10.1016/j.icarus.2005.01.007

Discovery of transneptunian object (TNO) satellites and determination of their orbits has recently enabled estimation of the size and albedo of several small TNOs, extending the size range of objects having known size and albedo down into the sub-100 km range. In this paper we compute albedo and size estimates or limits for 20 TNOs, using a consistent method for all binary objects and a consistent method for all objects having reported thermal fluxes. As is true for larger TNOs, the small objects show a remarkable diversity of albedos. Although the sample is limited, there do not yet appear to be any trends relating albedo to other observable properties or to dynamical class, with the possible exception of inclination. The observed albedo diversity of TNOs has important implications for computing the size-frequency distribution, the mass, and other global properties of the Kuiper belt derived from observations of objects' apparent magnitudes and may also point the way toward an improved compositional taxonomy based on albedo in addition to color.

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