Passage: In December 2004, Luu and Jewitt reported the discovery of crystalline water ice on Quaoar, which was at the time the largest known Kuiper Belt object.  They also found indications of ammonia hydrate.  Their report theorized that the ice likely formed underground, becoming exposed after a collision with another Kuiper Belt object sometime in the last few million years.In 2012, she won (along with David C. Jewitt of the University of California at Los Angeles) the Shaw Prize "for their discovery and characterization of trans-Neptunian bodies, an archeological treasure dating back to the formation of the solar system and the long-sought source of short period comets"

Question: What else did Luu and Jewitt find?
ammonia hydrate