Example of prediction result and orbit refinement for TNO (137295) 1999 RB216. Panel (a): same as that in Figure 2 for the TNO (137295) 1999 RB216. The ephemeris JPL#18 is used to determine the differences of NIMA minus JPL. This object belongs to the TNO main group (Table 5). Panel (b): occultation map showing the date and time (UTC) of the closest approach (largest blue point) between the shadow path and the geocenter; equatorial coordinates of the candidate star to be occulted; the closest approach (angular distance as seen from the occulting body, in arcseconds, between the geocenter and the largest blue dot); the position angle (angle measured, in degrees, from the north pole to the segment linking the geocenter and the largest blue point, counted clockwise); an estimate of the shadow speed on the Earth (km s⁻¹); the geocentric distance of the occulting body (au); the Gaia DR2 G magnitude of the occulted star normalized to a reference shadow speed of 20 km s⁻¹; and the magnitude of the occulted star from the Gaia DR2 red photometer also normalized to the same reference shadow speed. The dark and white areas indicate nighttime and daylight, respectively. The gray zone shows the limits of the terminator (see also Assafin et al. 2010 for a detailed description). The distance between the blue lines indicates the diameter of the occulting body. The prediction uncertainty is given by the red dashed lines. The arrow in the bottom right corner of the map indicates the sense of the movement of the shadow.