The eccentricities and orbital periods of planets with radii less than 4 R_⊕ that transit M dwarfs, with TOI-2257 b marked as a triangle. Planets marked with crosses (×) have eccentricities reported as upper limits only. Of the 251 planets in this population, only one has a more eccentric orbit than TOI-2257 b (excluding planets marked with crosses), and only eight have longer orbital periods. Data were retrieved from the NASA Exoplanet Archive (J. L. Christiansen et al. 2025) on 2026 September 4.