28978 Ixion
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28978 Ixion is a Kuiper belt object discovered in 2001 with a diameter of approximately 1055 km and a mean orbital radius of 39.31 AU. Ixion is a Plutino: it has a 3:2 orbital resonance with Neptune.

Little is known about Ixion. The latest spectroscopy results indicate that it has a surface that is a mixture of dark carbon and tholin, which is a heteropolymer formed by irradiation of clathrates of water and organic compounds (such as methane or ethane).

Reference

• Pre-print about Ixion's surface from the Planetary Systems Research group of the University of Helsinki.

The original article can be found at: http://en.wikipedia.org/wiki/28978_Ixion.
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