Reduced magnitude, m_V (1, 1, α), plotted against the phase angle, α. A total of 649 observations, obtained with the 2 m Liverpool telescope, the 1.5 m telescope at Sierra Nevada Observatory, and the 1.2 m telescope at Calar Alto Observatory, were analyzed. This plot was constructed after applying a sigma-clip rejection for outliers and selecting images with a signal-to-noise ratio greater than 30.