Given the rapid rotation , rare for objects so large , LOCATION@1 is thought to be an elongated spheroid -LRB- ratio of axis NUMBER@1 -RRB- , with a mean density around 1g/cm ³ -LRB- roughly the density of water -RRB- .

Given the fast rotation , which is not common for objects so big , LOCATION@1 is thought to be a stretched spheroid , with a density around 1g/cm ³ -LRB- close to the density of water -RRB- .
