Difference (black lines) in R.A. (left panel) and decl. (right panel) between the orbit determined with NIMA and that from JPL (version: JPL#4) for the TNO 2002 PD149. In the same way, blue dots are the differences between the observed positions and those from JPL ephemeris. This object belongs to the TNO extension group (Table 6). The sense of the differences is NIMA minus JPL.