Tracks of the primary (red dots) and secondary (blue dots) stellar images above Triton’s surface, as seen from Constância, plotted every 0.1 s. The junctions between the red and blue paths correspond to ingress (left) and egress (right) points for the Constância station. The arrows show the direction of the stellar images’ path. The regions probed by the central flash are those where the dots are more spaced. All the other stations probed essentially the same path (or part of it), with the primary and secondary images being swapped (as well as their directions of motion), depending on whether the station probed north or south of the shadow centre. Since the Earth and the Sun are angularly close (-1°) to each other as seen from Triton, the stellar paths essentially mark Triton’s terminator, the night side extending above the terminator in this figure. The two yellow symbols are for La Palma station, with ingress plotted as a star and egress plotted as a diamond. The two green symbols are the same for Helmos station and the two white symbols for Calern station (see Table 3 for the corresponding values of the latitudes and longitudes). The background image is a global colour map of Triton, produced using V2 data and orange, green, and blue filter images in order to obtain an approximation of Triton’s natural colours. Background image credits: image selection, radiometric calibration, geographic registration and photometric correction, and final mosaic assembly were performed by Dr. Paul Schenk at the Lunar and Planetary Institute, Houston, Texas. Image data are from V2 (NASA, JPL).