Horseshoe orbit in a planetary disk
= Horseshoe orbit in a planetary disk
= Horseshoe orbits in a planetary disk
{synonym}
A disk-<gas> trajectory that turns from one side of a <planet>'s orbital <radius> to the other in the corotating frame. Its angular-momentum exchange contributes to the <corotation torque>; repeated libration without restoring gradients can saturate that contribution.