Estimate of dust production rate Q_d for centaur 523676 (2013 UL10) for an average grain scatterer of size a = 1, 3, 10, 32, and 100 μm, respectively (continuous lines, from bottom to top). The filled dots represent values of Q_d obtainedwith the photometric model, applied for three particular combinations of a and v that were derived for comet C/1995 O1 (Hale–Bopp) at 6 au (see text).