Sky maps with an example of the resulting number of trails per exposures. The circles mark 0°, 10°, 20°, 30°, and 60° elevation. The observatory is located at +50° latitude; the sun at −18° elevation; the camera has a FOV with diameter L_fov = 6′ and the exposure time is 300 s. The satellites are those from Table 1. In the black region at the south-east, all satellites are already in the shadow of the Earth. The edges running from north-east to south-west correspond to constellation shells at lower altitudes, whose south-east parts are already in the shadow. The sharp features running from east to west correspond to the edges of constellation shells whose inclinations are close to the observatory latitude.