OrbitPath

addressreadonly

anchorreadonly

depthreadonly

How deep in the moon hierarchy: 1 for a planet, 2 for a moon.

kindreadonly

What is on this orbit, so a host can decide whether the trace is context.

A planetarium draws a subject's siblings to show where it sits. That was unambiguous while a star's children were eight planets; with fifty-nine dwarf planets, asteroids and comets in Sol it is a cage of a hundred and twenty-nine lines across the frame, and Bennu is somewhere behind it. kind is what lets a host draw the worlds and leave the rubble out.

namereadonly

parentreadonly

The primary's frame, and where it was when this trace was built.

Together they are what lets a host keep a trace correct without rebuilding it. The shape of the curve is fixed in the primary's frame; only the anchor moves, so re-hanging it is one vector difference for the whole path rather than a fresh period of Kepler solves. That matters: rebuilding every trace in a system costs a few milliseconds, which is a visible hitch at 60 Hz and would happen on every frame of time warp.

pointsreadonly

Closed: the last point is one full period on, which is the first again.

radiusreadonly

The body's radius, so a host can place each point the way it places the body itself. It matters more than it looks: render compression keys off an object's own radius, so a path placed as a radius-zero point is drawn at a completely different depth from the planet it belongs to — six times nearer, at Jupiter's range. See placement.ts.