A fixed 41.763-day orbit has a 1.96 m/s amplitude in 267 HD 164922 daily bins under a selected noise model

We test the fixed 41.763-day California Legacy Survey (CLS) orbit of HD 164922 with public HARPS-N velocities. Earlier work treated a signal near this period as stellar activity. We apply the two source-paper quality exclusions and combine 312 exposures into 267 daily bins. We fit a signed orbit amplitude and terms for the other reported periods together. The planned primary covariance leaves excess scatter: Q=418.08 for 252 residual degrees of freedom. We then fit extra independent noise for each of ten specified correlated-noise shapes. The best of these ten gives amplitude 1.956 +/- 0.338 m/s. Its conditional Gaussian 95 percent interval is 1.293 to 2.619 m/s. This interval contains the CLS median of 2.064 m/s. The selected noise shape has amplitude 2 m/s, decay 20 days, rotation period 42.3 days, and fitted independent noise 1.125 m/s. A noon-cut control gives 1.947 +/- 0.341 m/s. Conditional phase and time-group tests show no disagreement with the published signal. A nonperiodic noise control has a lower restricted likelihood score than the selected ten-model case. A standardized residual of 4.54 remains. The interval excludes noise parameter error, model selection, joint orbit error, and residual-tail uncertainty. All noise scores include the fixed orbit; this is not a planet-versus-activity comparison. We missed the source exclusions in the initial audit and applied them after a residual check. The planned all-row result, its unfavorable diagnostics, and all later changes are preserved. This separate-instrument test supports agreement with the published velocity signal under stated assumptions. It does not establish its cause or a new planet. The package contains exact inputs, source hashes, code, results, figures, and repeat instructions.

HD 164922 · radial velocity · stellar activity · exoplanet validation · HARPS-N · California Legacy Survey · correlated noise · reproducible research