Distribution of ground-based observations in OCNS2019 for Triton, Nereid, the set of inner satellites of Neptune (obsTrg = 805-808, i.e., Despina, Galatea, Larissa, and Proteus), and the set of outer satellites of Neptune (obsTrg = 809-813, i.e., Halimede, Psamathe, Sao, Laomedeia, and Neso). For each satellite or set of satellites, both the histogram of the number of observations, N, and the observation nights at each opposition, N_g, are presented.