Detectability of the simulated population of companions to TOI-5110b capable of exciting the planet’s eccentricity leading to HEM. Black dots are not detectable with our RV measurements or Gaia astrometry, blue circles are detectable in our RV data, and red crosses are detectable with astrometry. Dashed gray lines represent RV semi-amplitudes of, from bottom to top, 3, 10, 30, 100, and 300 m/s. The shape of the distribution of companions is constrained by stability (in the upper left) and general relativity (in the lower right).