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We have acquired near-infrared spectra of Kuiper belt objects 2003 UZ117,2005 CB79 and 2004 SB60 with NIRC on the Keck I Telescope. These objects aredynamically close to the core of the 2003 EL61 collisional family and weresuggested to be potential fragments of this collision by Ragozzine and Brown(2007). We find that the spectra of 2003 UZ117 and 2005 CB79 both show thecharacteristic strong water ice absorption features seen exclusively on 2003EL61, its largest satellite, and the six other known collisional fragments. Incontrast, we find that the near infrared spectrum of 2004 SB60 is essentiallyfeatureless with a fraction of water ice of less than 5%. We discuss theimplications of the discovery of these additional family members forunderstanding the formation and evolution of this collisional family in theouter solar system.

Detection of Additional Members of the 2003 EL61 Family via Infrared Spectroscopy