(612620) 2003 SQ317
is a classical Kuiper belt object (cubewano) belonging to the hot population. Its size estimated to lie between 150 and 450 km based on a range of plausible albedos. The object has a large light curve amplitude of about 0.85, which indicates that it has an extremely elongated shape or is a contact binary. In the former case the density of is estimated at about 0.86 g/cm3 and its axis ratios at 0.55 and 0.41. If is a contact binary, which is actually more likely, the density is estimated at about 2.67 g/cm3. In the latter case, the components are also thought to be unequal in size with the mass ratio of about 0.3 and axis ratios of about 0.8 and 0.5, respectively, for the primary and secondary components. was identified as a member of the Haumea family, which is defined based on a common pattern of IR water-ice absorption, neutral visible spectrum and the clustering of the orbital elements. The Haumea family members including , , , and others all appear to be collisional fragments broken off of the dwarf planet .
Origin
The surface of is made of water ice.