Maximum temperature of planetesimals of 250 km in radius for different values of the ²⁶Al/²⁷A1 ratio relative to that of the CAI-forming region. For early starting times, within approximately two ²⁶Al half-lives (t_1/2= 700 000 yr), the resulting structure becomes like Vesta with an iron core and a mantle with a high content of FeO. Starting times between two and three half-lives instead lead to the formation of a desiccated body that has lost its minerally bound water but not differentiated. Ceres analogues consisting of clay and ice form between three and four half-lives and the original primitive composition can be maintained by an even later formation. We mark with a dashed line the likely reduced ²⁶Al/²⁷Al budget in the asteroid belt relative to the CAI-forming region (Larsen et al. 2011; Schiller et al. 2015).