Optimistic (light green) and conservative (dark green) habitable zone for 1 M_⊕ according to Kopparapu et al. (2014). Teegarden’s Star planets b and c are shown for two stellar parameter sets (red dots: Schweitzer et al. 2019; blue dots: Rojas-Ayala et al. 2012; Dieterich et al. 2014). The insolation error bar depicts the effect due to intrinsic uncertainty in T_eff. For comparison, we plot nine planets (including Proxima b and TRAPPIST-1 e, f, and g) from the Habitable Exoplanet Catalog¹² (black circles) and the Earth (black circled plus) at the top. All symbol sizes scale with the fourth power of the Earth Similarity Index (ESI) assuming a rocky composition.