Yellow hypergiants and YSGs on the HR diagram. YHGs are shown as filled yellow circles, and YSGs and candidate YHGs are shown as empty yellow circles. Literature values for four YHGs are shown as grey circles. The HD luminosity limit (Humphreys 1978) is marked with a dashed line. Solar metallicity evolutionary tracks (Ekström et al. 2012) are shown as dotted light grey lines. Top panel: yellow hypergiants and YSGs only. Bottom panel: literature data for Galactic RSGs (red squares; Healy et al. 2024), LBVs (cyan diamonds; Smith et al. 2019), and B[e] Supergiant stars (blue triangles; Miroshnichenko et al. 2025) are shown for comparison.