Results of (a−c) for Interamnia as a function of mean density for homogeneous case (sequence of black dots) and core-mantle differentiated case (blue vertical dots). For the latter case, we explored the 1100–1600 kg m⁻³ range for themantle density, and the 2050–3400 kg m⁻³ range for the core density while keeping the bulk density at a constant value of 1980 kg m⁻³. The value of a−c decreases when mass increases with depth. The purple cross represents the value derived in Sect. 3.4 with its 1σ uncertainty (uncertainties of a and b are added quadratically). Finally, the green dot represents the values of (a−c) for the homogeneous case and Interamnia’s assumed faster rotation period of 7.1 h.