A 2.2 Earth-radius Planet Candidate on a 5.92-day Orbit around the K dwarf TIC 306470257

I report a transit-like signal in TESS photometry of the K dwarf TIC 306470257 (T = 12.93, 176 pc). The signal repeats every 5.92354 days with a depth of 947 ppm and a duration of 2.36 hours; a dip is seen at this ephemeris in all four TESS observing-season groups spanning 2018–2026. When each season is hidden in turn, a fit to the other seasons predicts its transits in all four cases. If it orbits the target, the transiting object has a radius of 2.18 Earth radii. Statistical validation is not claimed: TRICERATOPS gives a false-positive probability of 0.041 and a nearby false-positive probability of 0.0034. Preprint of a Research Note of the AAS. The record also holds the data behind it: the detrended TESS light curve, the transit-fit posterior summary and the hold-out (hide-one-season) results. Claude (Anthropic) was used to help draft this text; I checked and verified all content.