Son of Comet
Perhaps a piece of a "comet" that orbits the sun near the asteroid belt. It's "weird" nature sounds like what I know about comets. Ice in space ... comets. Dark surface ... comets. Outgassing ... comets. Rotation ... every space object rotates and continues to rotate for a very long time since there is little "friction." Its brother asteroids are rotating.
Biting the hand that feeds IT
