尽管奥库斯星的运行方向与冥王星不同，却共享一个比例为2:3的共振。
Both Pluto and Orcus also share a 2:3 resonance with Neptune , although Orcus is oriented differently .
冥王星的卡伦卫星的体积是冥王星的一半；而万斯卫星的体积则是奥库斯星的1/3。
Pluto 's moon Charon is half the size of Pluto , and Vanth has been estimated to be one-third the size of Orcus .
奥库斯