Water ice on the satellite of kuiper belt object 2003 el61

@article{Barkume2006WaterIO,
  title={Water ice on the satellite of kuiper belt object 2003 el61},
  author={Kristina M. Barkume and Michael E. Brown and Emily L. Schaller},
  journal={The Astrophysical Journal},
  year={2006},
  volume={640}
}
We have obtained a near-infrared spectrum of the brightest satellite of the large Kuiper Belt object 2003 EL_(61). The spectrum has absorption features at 1.5 and 2.0 μm, indicating that water ice is present on the surface. We find that the satellite's absorption lines are much deeper than water ice features typically found on Kuiper Belt objects. We argue that the unusual spectrum indicates that the satellite was likely formed by impact and not by capture. 

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TLDR
The discovery of a family of Kuiper belt objects with surface properties and orbits that are nearly identical to those of 2003 EL61, which appears to be fragments of the ejected ice mantle of2003 EL61. Expand
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