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We present new solar phase curve observations of the 2003 EL61 collisionalfamily showing that all the members have light-scattering properties similar tothe bright icy satellites and dwarf planets. Compared to other Kuiper Beltobjects, the five family members we observe (2003 EL61, 2002 TX300, 2003 OP32,2005 RR43, and 1995 SM55) have conspicuously neutral color (V-I = 0.6-0.8 mag)and flat phase curves at small phase angles (phase coefficients of 0.0 - 0.1mag deg-1). Comparing the phase curves we observe for other icy Kuiper Beltobjects to the phase curves of icy satellites, we find that the flat phasecurves of the 2003 EL61 family are an indication they have high albedo surfacescoated with fresh ice in the last ~100 Myr. We examine possible resurfacingprocesses and find none that are plausible. To avoid the influence of cosmicradiation that darkens and reddens most icy surfaces on times scales > ~100Myr, the family members must be unusually depleted in carbon, or else thecollision that created the family occurred so recently that the parent body andfragments have not had time to darken. We also find a rotation period of 4.845(+/- 0.003) h with amplitude 0.26 (+/- 0.04) mags for 2003 OP32.

The Youthful Appearance of the 2003 EL61 Collisional Family