Sednaball is a dwarf planetball on the edge of the solar system. He is the most distant dwarf planetball of the Solar system (in the beginning of Kuiper Belt), so he is very lonely.
Or is he?
Like many KBOs, he likely has a mantle of water ice. He appears to be very red, even redder than Marsball, likely to the presence of tholins.
Orbit - Rotation