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The near-infrared spectrum of (50000) Quaoar obtained at the Keck Observatoryshows distinct absorption features of crystalline water ice, solid methane andethane, and possibly other higher order hydrocarbons. Quaoar is only the fifthKuiper belt object on which volatile ices have been detected. The small amountof methane on an otherwise water ice dominated surface suggests that Quaoar isa transition object between the dominant volatile-poor small Kuiper beltobjects (KBOs) and the few volatile-rich large KBOs such as Pluto and Eris.

Detection of methane on Kuiper Belt Object (50000) Quaoar