void update_killer(Orbit obt, double startUT, double endUT)
 {
     while (!KillerOrbit && obt != null && obt.referenceBody != null && obt.StartUT < endUT)
     {
         var PeR_UT = obt.StartUT + obt.timeToPe;
         var MinPeR = obt.MinPeR();
         KillerOrbit |= PeR_UT <= obt.EndUT && startUT <= PeR_UT && PeR_UT <= endUT && obt.PeR <= MinPeR;
         KillerOrbit |= obt.Contains(startUT) && obt.getRelativePositionAtUT(startUT).magnitude <= MinPeR;
         KillerOrbit |= obt.Contains(endUT) && obt.getRelativePositionAtUT(endUT).magnitude <= MinPeR;
         if (obt.patchEndTransition == Orbit.PatchTransitionType.FINAL)
         {
             break;
         }
         obt = obt.nextPatch;
     }
 }