Semi-major axis vs. eccentricity of multi-opposition trans-Neptunian objects. Large circles represent TNOs with H ⩽ 4.5 mag. This figure shows several distinct dynamical KBO populations. Vertical dashed lines show the main resonances with Neptune as well as the Neptune Trojans in the 1:1 resonance. Scattered disk objects have perihelia 30 ≲ peri ≲ 45 AU as shown between the dashed lines. Classical objects are in the lower center portion of the figure and include the main Kuiper Belt (MKB) with its high and low inclination populations. There also appears to be a high and low eccentricity population of large objects. An edge near 50 AU can clearly be seen for low eccentricity objects. Centaurs are on unstable orbits between the giant planets. Sedna stands out as being significantly below the perihelion line shown at 45 AU demonstrating its decoupled influence from Neptune unlike the scattered disk objects.