Phases, ϕ, covered during the eight nights. The open grey circles show all observations and the solid coloured circles show the frames used in the final analysis (see Table 1) from each night. Discarding unusable data from Night 4 left a gap in the phase coverage. The smallest phase observed (ϕ = 0.36), the largest phase observed (ϕ = 0.64), and the point of inferior conjunction (ϕ = 0.5), are marked.