Blue circle: UCD with the original name Y4289 (Richtler et al. 2008), which is a confirmed member of Fornax. The UCD itself has an absolute magnitude of M_V = −10.3 and a color of (V−I) = 1.21 ± 0.05. The four surrounding GC candidates Dirsch et al. (2003) are shown with green circles and they are labeled with their respective C−T₁ colors. A circle with a radius of 1.36 kpc, centered on the UCD, is shown in red. This circle denotes the estimated tidal radius from Eq. (8). The cutout has been taken from the wide-field VST Fornax survey imaging (Iodice et al., in prep.)