Corrected flux from seven TESS visits gives 9.9–15.0 ppm bounds on a coherent 713.7 microhertz signal in HD 217522 under a block noise model

A 2026 report describes a transient 713.7 microhertz signal in HD 217522 from Johnson B observations in 2014. We test this frequency in seven public TESS visits from 2018 to 2026. No visit gives a significant coherent signal at that frequency. Separate approximate 95% upper bounds are 9.9–15.0 parts per million in corrected flux. They assume constant sine-wave amplitude and phase within a visit and independent, symmetric noise in two-hour blocks. Aperture flux gives weaker bounds of 12.1–22.9 parts per million. Changes in trend length and block length retain the corrected-flux result. Two native 20-second records give similar bounds. A wider frequency search gives a smallest p value of 0.1722 after correction for seven visits. In 148 one-day fits, the median upper bound is 54.2 parts per million. No daily result is significant after correction for all days. These bounds concern later coherent signals in the TESS band. They do not exclude a transient event in 2014, shorter bursts, or changes in frequency. The package preserves nine source FITS files, hashes, code, tables, and figures.

HD 217522 · TIC 139191168 · TESS · rapidly oscillating Ap stars · stellar pulsations · amplitude bounds · public data · wild bootstrap