One β's dust curve: nucleus-relative points from youngest to oldest.
km, nucleus-relative, render axes. points[0] is the nucleus.
Age of each point's grains, days.
0–1: how bright each point is — the activity when its grains were released, fading out with age.
Width (radius) of the curve at each point, km.
One β's dust curve: nucleus-relative points from youngest to oldest.