The TESS Sector 91 transit of K2-290 c agrees with the 2025 linear orbit model

Does the revised orbit clock of K2-290 c predict a later transit? We measure the event in public TESS Sector 91 data from April 2025. These data were collected after the revised model was posted. A symmetric transit fit gives a center of 2460776.13556 BJD TDB. The formal timing error is 2.24 minutes. Twelve artificial transit tests give an RMS timing error of 3.06 minutes. We use 3.1 minutes as a working error scale. Fourteen transit fits span 2.02 minutes. An independent trapezoid fit differs by 0.48 minute. The measured event is 1.20 minutes after the Saha (2025) forecast and 74.56 minutes after the Hjorth et al. (2019) discovery forecast. We allow all possible epoch-period correlations when we propagate published clock errors. The revised clock agrees with the event across these bounds. The old forecast has an error of about 34 minutes, so its central offset is weak evidence for a physical change. This study supplies a later transit time, source data, code, figures, and complete control results. It does not establish a period change or a new planet.

K2-290 c · TESS Sector 91 · transit timing · ephemeris · reproducible astronomy