Syndyne-synchrone diagram overimposed on a VW139 image. The density of the particles is assumed at ρ = 1000 kg m^-3. The synchrones are shown as solid white lines, and correspond, in clockwise order, to +108, +81, +54, +27, 0, −27, and −54 days to perihelion, as labeled. Syndynes are shown as white dashed lines, and correspond to 0.0012, 0.0025, 0.01, and 0.05 cm, as labeled. The M- and N-axis are scaled independently to avoid label crowding. The bright feature on the left centered at approximate coordinates (− 5000,7000) corresponds to a a bright field star that can be seen in Fig. 1 placed near the middle of the left ordinate axis.