Models of: (top) H_v magnitude; (middle) optical light curve amplitude; and (iii) apparent diameter of Chariklo for the three shape models (Mclaurin spheroid, Jacobi ellipsoid, and generic triaxial ellipsoid) of Leiva et al. (2017). In the top panel, photometric data are from Fornasier et al. (2014). For the two ellipsoid cases, the model H_v is the mean value over the light curve. In the middle panel, light curve amplitudes Δm = 0.13 ± 0.03 and 0.08 ± 0.03 mag in 2006 and 2013 (Galiazzo et al. 2016; Fornasier et al. 2014) and an upper limit ( mag) in 1997 (Davies et al. 1998) are shown; the spheroid model does not produce any light curve. In the bottom panel, the diameter reported by Jewitt & Kalas (1998) for 1998 and in this work for 2006–2010 (Spitzer, WISE, Herschel) are shown (an additional measurement from WISE in 2010 – Bauer et al. 2013, – giving D = 226.1 ± 29.3 km, is not reported for plotting clarity). For the two ellipsoid cases, the apparent diameter is calculated at light curve maximum and minimum (dotted lines) and at the intermediate phase (solid lines). No contribution of Chariklo’s rings to the thermal emission is assumed here.