# Does mission control track craft in an adjacent orbit on the Mercator?

shows the Mercator screen at the centre. I'm probably wrong about this (feel free to shoot me down) but the Mercator up there appears to render what look like 3 different orbit tracks.

Why are there 3 orbit tracks? Does Mission control track multiple craft in adjacent orbit? Are these something like an nominal, sub-nominal, and supra-nominal orbit? What is the typical margin between these orbits?

• @FraserOfSmeg But by then, which spacecraft atom is it that you are tracking? :) – a CVn Apr 30 '14 at 21:45